TECHLINEnews. New 2015 Silverado HD and Sierra HD. Discontinued Techline Support for Internet Explorer 8

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1 April 2014, Volume 16, No. 4 New 2015 Silverado HD and Sierra HD The new 2015 Silverado 2500HD-3500HD and Sierra 2500HD-3500HD pickup trucks recently made their debut. These new trucks feature all-new exterior designs along with many of the same enhancements found on the new 2014 Silverado 1500LD and Sierra 1500LD trucks. Plus, the trucks feature the latest generation Chevrolet MyLink and GMC IntelliLink infotainment systems. TECHLINEnews Discontinued Techline Support for Internet Explorer 8 continued on page 2 GM is updating the Dealership Infrastructure Guidelines to indicate that Internet Explorer 9 (IE 9) is the recommended and minimum browser. With this change, GM will discontinue support for Internet Explorer (IE) 8 on April 14, A recent query of Techline PC browser use shows most computers are already on IE 9, with less than 20% of computers using IE 8. TIP: In the next 30 days, please update to IE 9 if you have not done so already. To update to IE 9, go to following link and select the appropriate operating system under English: continued on page 3 CONTENTS New 2015 Silverado HD and Sierra HD... 1 Discontinued Techline Support for Internet Explorer Favorite List Infotainment Display The HD Trucks CNG System... 4 Results of 2013 Technician Survey Removing a Transportation Cover ELR Door Glass Adjustment HVAC Temperature Fluctuations eassist Battery Module/Exchange Update Incorrect Remote Control Door Lock Receiver Rear Toe Adjust Link Dampener Stop Lamp and Turn Signal Lamp Options.. 9 Power Memory Seat Operation Windshield Pop Noise Service Know-How Car Issues Fix It Right the First Time Truck Issues Fix It Right the First Time Customer Care and Aftersales

2 New 2015 Silverado HD and Sierra HD continued from page 1 The HD trucks are equipped with carryover chassis systems and powertrains from the previous generation HD trucks that are proven, powerful and extremely reliable. The HD trucks feature a choice of gasoline, bi-fuel and diesel engines. Gasoline 6.0L V8 (RPO L96) The 6.0L V8 engine in the Silverado HD and Sierra HD produces 360 hp and 380 lb-ft of torque. In Silverado HD and Sierra HD models greater than 10,000 lbs. (cab chassis models only), the engine generates 322 hp and 380 lb-ft of torque. In Canada, these engines are rated at 335 hp. Bi-Fuel Gasoline/CNG 6.0L V8 (RPO LC8) When using gasoline, the bi-fuel 6.0L V8 in the Silverado HD and Sierra HD produces 360 hp and 380 lb-ft of torque. When using CNG, the engine has 301 hp and 333 lb-ft of torque. Diesel 6.6L V8 (RPO LML) The 6.6L Duramax diesel V8 engine in the Silverado HD and Sierra HD generates 397 hp and 765 lb-ft of torque. Use only Ultra Low Sulfur Diesel Fuel or biodiesel blends up to 20% (B20). Avoid the use of biodiesel blends above 20%, which may damage the engine and fuel system. The Diesel Exhaust Fluid (DEF) tank should be filled just prior to delivery using GM-approved DEF fluid, or fluid containing the API certified or ISO label. The Duramax diesel features an elevated cold engine idle that can be turned on or off. To turn this feature on or off: 1. Turn the ignition to ON/RUN, with the vehicle off. 2. Press the accelerator pedal to the floor and hold while quickly pressing the brake pedal three times in less than eight seconds. 3. Release the accelerator pedal and start the engine. The 2015 HD trucks offer two automatic transmissions: the Hydra- Matic 6L90 6-speed automatic transmission (RPO MYD) or the Allison speed automatic transmission (RPO MW7). On 3500HD Cab Chassis models, the Allison speed automatic has an available Power Take Off (PTO). Under normal operating conditions, the PTO light on the instrument cluster will remain on throughout the PTO operating cycle. The PTO light will turn on and then turn off after one second If all conditions required to engage PTO have not been met when enabling PTO. Brake System A new brake fluid is required on the 2015 HD trucks. It has enhanced corrosion inhibitors and significant improvements in lubricity to help eliminate master cylinder squeak/noise. In the United States, use brake fluid GM P/N and, in Canada, use brake fluid GM P/N Do not use any brake fluid. New to the dual rear wheel trucks and the cab chassis is a TRW EBC460 4-wheel disc brake antilock brake system. The electronic brake control module and the brake pressure modulator are serviced separately. A number of vehicle performance enhancement systems also are available that aid in control of the vehicle in a variety of driving conditions. Hill Descent Control Hill Descent Control (HDC) sets and maintains vehicle speed while descending a very steep incline in a forward or reverse gear. Press the HDC switch on the center of the instrument panel to enable or disable HDC. Vehicle speed must be less than 31 mph (50 km/h). The HDC light displays on the instrument cluster when enabled. HDC can maintain vehicle speeds between 2 and 14 mph (3 and 22 km/h) on an incline greater than or equal to a 10% grade. A blinking HDC light indicates the system is actively applying the brakes to maintain vehicle speed. When HDC is activated, the initial HDC speed is set to the current driving speed. It can be increased or decreased by applying the accelerator or brake pedal. This adjusted speed becomes the new set speed. HDC will remain enabled between 14 and 37 mph (22 and 60 km/h); however, vehicle speed cannot be set or maintained in this range. It will automatically disable if the vehicle speed is equal to or greater than 50 mph (80 km/h), or more than 60 km/h (37 mph) for at least 30 seconds. Press the HDC switch again to re-enable HDC. Integrated Trailer Brake Control New for 2015 HD trucks, the Integrated Trailer Brake Control is now compatible with electric over hydraulic trailer brakes. The Integrated Trailer Brake Control system can be used to adjust the amount of power output, or Trailer Gain, available to the trailer brakes. The control panel also allows manual application of the trailer brakes. Trailer Sway Control Trailer Sway Control will detect any vehicle yaw (rotation) instability, caused by unintended side-to-side motion of a trailer while being towed. If sway is detected, the vehicle brakes are selectively applied at each wheel to help reduce excessive trailer sway. The engine torque also may be reduced to slow down the vehicle. 5th Wheel Wire Harness The optional 5th wheel wire harness (RPO UY2) is in a different location on the 2015 HD trucks. The harness is now located on the rear cross member just forward of the rear bumper in the center of the truck, not on the front left box mount as it was on the previous truck model. Hill Descent Control switch New 5th wheel wire harness location continued on page 3 2 April 2014

3 New 2015 Silverado HD and Sierra HD continued from page 2 Duramax Diesel Engine Exhaust Brake The diesel engine exhaust brake enhances the vehicle brake system and reduces brake lining wear by using engine braking created by the variable vanes in the turbocharger to generate additional backpressure in the engine. Diesel exhaust brake switch The exhaust brake switch on the center of the instrument panel activates the system. The switch must be pressed at each vehicle start for the system to be active. GDS 2 The 2015 HD trucks use GM s Global A electrical architecture. This architecture requires the use of the Global Diagnostic System 2 (GDS 2) software and the Multiple Diagnostic Interface (MDI) module. TIP: Do not swap modules in an attempt to diagnose a vehicle condition. When certain modules are programmed and configured during installation, the module learns a specific environment identifier that is unique to the vehicle. With an incorrect identifier, vehicle starting is disabled. Rear Vision Camera and Park Assist The 2015 HD trucks features a Rear Vision Camera and Front and Rear Park Assist, which provide a view directly behind the vehicle when in Reverse as well as distance-to-closest-object information. TIP: The RVC and Rear Park Assist (RPA) will not work properly if the tailgate is down. If the tailgate is down, do not use these systems. The Rear Vision Camera must be disconnected if the tailgate needs to be removed by disconnecting the connector from the electrical junction block on the left side of the cross member of the vehicle frame. After disconnecting, use the cap mounted next to the camera connector to cover the open terminals on the junction block. TIP: Do not install any brush guards, grill guards, winches etc., on vehicles equipped with front park assist. Rear park assist can be turned OFF, ON or ON with Towbar through the Vehicle Settings menu. The ON with Towbar setting allows for the park assist system to work properly with a small item attached to the trailer hitch. Turn the rear park assist system off when towing a trailer or using a large drawbar. Transport Mode The HD trucks are shipped in Transport Mode to save battery power. To turn the Transport Mode off, start the vehicle, activate the hazard flashers, press the brake pedal, and then turn the ignition key to the crank position for 15 seconds. The same steps are used to turn on the feature. Thanks to B.J. Lackey and Sherman Dixon Favorites List Infotainment Display 2015 Suburban, Tahoe, Yukon, Yukon XL; La- Crosse, CTS coupe, ELR, Corvette, Impala, Silverado 1500, Sierra 1500; and ATS, SRX, and XTS models with Infotainment Systems RPO IO5 or RPO IO6 will have part of the infotainment display covered when the radio station favorites list is maximized. This will prevent the selection of certain functions. Radio station favorites list maximized This is a normal operating characteristic and no repairs should be made. The hidden screen functions can be accessed again after the user minimizes the favorites list. The favorites list can be minimized by dragging it to the bottom of the display. Thanks to Steven Morris TECHLINEnews Discontinued Techline Support continued from page 1 The use of other browsers, as well as IE 10 and IE 11, are common questions taken by the Techline Customer Support Center (TCSC). At this time, GM does not endorse the use of IE 10 or 11. Although both browsers are available for download from Microsoft, the Techline applications (SI, TIS2Web, GDS2, Tech- 2Win, etc.) have not been tested against the newest IE browser versions. In addition, there is no plan to approve the use of other browsers, such as Firefox, Safari, Chrome, etc. Any questions regarding browser use on Techline PCs should be directed to the TCSC at (English) or (French). Thanks to Lisa Scott April

4 The HD Trucks CNG System The new 2015 Silverado 2500HD and Sierra 2500HD pickup trucks feature bi-fuel gasoline/cng operation. The operation of the bi-fuel gasoline/cng 6.0L V8 engine (RPO LC8) is very similar to past model years. For 2015, there are new switches and Driver Information Center (DIC) messages. The 6.0L V8 engine is equipped with special hardened valves and valve seats to enable operation on gasoline or compressed natural gas (CNG). CNG Indicator Lamp The CNG fuel selector switch indicator on the center of the instrument panel shows the current fuel mode, indicates a transition between fuels and if there is a system error. Off: Vehicle is currently operating on gasoline. On: Vehicle is currently operating on CNG. Flashing Slowly (Once per Second): Vehicle is awaiting changeover to selected fuel or has started the changeover. Flashing Rapidly (10 Times per Second): CNG system error. The light will continue to flash rapidly until the problem is corrected. CNG Fuel Selector Switch Regardless of which fuel mode is selected, gasoline or CNG, the vehicle always starts on gasoline. When the ignition is in ON/ RUN, press the CNG fuel selector switch to select gasoline or CNG. When CNG mode is selected, the vehicle will automatically CNG fuel selector switch indicator transition from gasoline to CNG when conditions for CNG operation have been met. While waiting to transition, the fuel selector switch indicator will flash. At temperatures colder than 32 F (0 C), it may take 10 to 15 minutes for the vehicle to switch from gasoline to CNG. If operating in CNG mode and the CNG tank is emptied, the vehicle will automatically switch to gasoline operation and the switch indicator will flash continuously. Press the CNG fuel selector switch to stop the indicator flashing. Always keep the gasoline tank adequately filled. The system will not switch over to CNG operation if the vehicle runs out of gasoline. TIP: If the vehicle is heavily loaded, such as when towing a trailer up a grade, it may be prevented from switching to CNG. Once the high loads are no longer present, the system will switch. Fuel Gauge Operation The vehicle has a gasoline/cng fuel gauge. When the ignition is ON, the gasoline/cng fuel gauge indicates approximately how much fuel is left in the tank. When the engine is running, the fuel gauge displays the level for the type of fuel that is currently being used. The fuel level for the second fuel that is not being used (gasoline or CNG) is displayed in the DIC. CNG Fuel Tank There are two methods of refueling: fast filling or slow filling. Fast filling is normally used in fuel stations for natural gas vehicles. It takes about six to eight minutes to fill up the fuel tank. Slow filling is done with a vehicle refueling appliance or a time-fill post provided by the fleet operator. Refueling time varies depending upon the refueling system used. The fuel gauge and DIC display fuel levels. Turn off the engine prior to refilling. Remove the dust cap from the fuel fill valve/receptacle, clean off any dirt or debris on the fuel fill valve/receptacle, and follow the refueling instructions on the pump or provided by the station operator. Refueling will Fuel fill valve/receptacle stop automatically when the tank is full. Wait for the high pressure fuel to be purged from the hose before disconnecting. To disconnect the vehicle from the refueling station, remove the nozzle from the fuel fill valve/receptacle. A hissing sound may be heard as a small amount of natural gas escapes. This is normal. Put the fill valve dust cap on securely and close the fuel fill door. Thanks to B.J. Lackey, Sherman Dixon and Chris Graham 4 April 2014

5 Results of 2013 North American Technician Survey In September and October, 2013, technicians in U.S. auto dealerships were given the opportunity to participate in an annual Technician Survey, conducted by Carlisle & Company, a provider of aftersales strategic guidance and tactical solutions for the world s leading motor vehicle brands. About the Survey About 9,000 service technicians representing 15 automotive OEMs/brands chose to participate. The purpose of the survey is to collect feedback on dealership service trends, technician satisfaction, and dealership operational challenges as well as to gain a better understanding about whether technicians receive the appropriate level of support from the manufacturer and their dealership. TIP: As a result of feedback from the 2012 survey, the GM Service Technical College (STC) has opened two new satellite training centers to address the preference for more hands-on training classes. In addition, a need for more timely responses by the Technical Assistance Center (TAC) has been addressed by an improved escalation process to resolve issues in less time. Here are the results of the 2013 survey. About the Technicians The average technician is about 41 years old, and has been working for 19 years as a technician. Most technicians have spent about half their careers with their current dealership. Younger technicians are more likely than older ones to have obtained their education in a trade school or a 2-year college; older ones were more likely educated in a 4-year college or in the military. Why They Chose Their Current Job Respondents could select from fifteen reasons for choosing their current job. The top three reasons they gave were: brand interest, pay, and dealership location. The bottom reasons were benefits, labor times, tech training, and other. The other choices included (in no particular order) personal, work environment, career advancement, management, volume of business, working hours, award programs and none. Satisfaction with Job Choice When asked, Do you feel like you made the right decision when selecting this job? the highest satisfaction was among those who chose their job based on management or working environment. Another question presented eight factors that contributed to satisfaction with the current job. Tech training got the highest score, followed by (in order) work quality, work environment, management, OEM concern, career, pay, and warranty labor rates. How Technicians Spend Their Time Technicians spend 20 40% of their time on diagnostic work, 25% on routine maintenance, with the remainder going to heavy repair, lube/oil/filter, and other. About 50% of their work time is spent on warranty work. Earning Ratios Earning ratios are defined as hours earned vs. hours worked. These ratios varied from just over 100% to about 130%. High earned ratios are not a strong driver of high annual pay. Instead, high hourly rates (typically found at luxury brands) are a bigger driver of annual pay. Career Progression On average, only 27% of technicians stated that they were satisfied with their career progression. Not surprisingly, those who are relatively satisfied with their career progression want to stay at their same job at same dealership, while those that are not satisfied want either to increase their certification or to exit the industry. Technicians who feel stuck see this as an industry problem, not a dealership problem. Relatively few technicians who are dissatisfied want to change dealerships. Lube/Oil/Filter Work Lube/Oil/Filter (LOF) is seen as an entry-level position. Twentyone percent (21%) of technicians spend more than 20% of their time on LOF, yet very few dealerships have a career progression plan for these technicians. The more time a technician spends on LOF, the lower their satisfaction with their career progression, and the more they question whether they took the right job. Improving Repairs Improved parts availability was the most often cited factor to enable efficient, quality repairs. Respondents said the top parts availability problem was that their dealership doesn t stock enough inventory, followed by ordering the wrong part, and the OEM doesn t respond in a timely fashion. The second factor to enable efficient, quality repairs was improved communication between the service consultant and the technician. Technicians reported that on average, 43% of all repair orders require service consultant clarification, which consumes about 30 minutes per day per technician. Additionally, about 1/3 of customers are provided unrealistic waiting times. Other factors to enable efficient, quality repairs were tech training, special tools, online or phone tech support and new model support. Tech Training Of all the categories on the survey, technicians reported the highest satisfaction with technical training ( brand provides the right technical training and my dealership supports me in obtaining training ). The more clear an OEM s training requirements, the higher the overall satisfaction with their technical training. The average technician obtains about 100 hours of tech training per year. The most satisfied technicians spend the most hours in training, spend the most training hours at in-person training centers, and spend the fewest hours in self-study. Special Tools Special tools are considered appropriate, but they re not being stocked sufficiently. The industry average is only about 4% of technicians who say that their dealership stocks a sufficient assortment of special tools. And 2/3 of the industry does not have a special tools management system. On average, each special tool is shared by about seven technicians. Service Information Technicians were asked to rate their OEMs service information using evaluators such as easy to understand, easy to find, accurate and complete, etc. continued on page 6 April

6 Removing a Transportation Cover Beginning this month, the 2014 ELR will use a transportation cover to help protect the vehicle while in transport as well as in dealership inventory. The 2014 Corvette uses a similar cover. The transportation cover must be partially removed in order to perform the Pre-Delivery Inspection (PDI). It can be reinstalled to protect the vehicle until delivery. Unhook the elastic from the front fascia and roll the edge of the cover back slightly to remove any debris. Repeat this procedure for the rear fascia. Next, unhook the clips from the floor pan bracket along the right and left sides of the vehicle. In each of the four wheel openings, release the hard flap holding the cover. From the rear of the vehicle, fold the cover from the left and right sides toward the middle, and then roll the cover toward the front of the vehicle, stopping at the windshield. ELR transportation cover To enter the vehicle, unzip the cover over the driver s door, roll it up and secure it using the Velcro strap and retaining flap above the door. There also are zippered openings to access the fuel door and the charge port door. To partially remove the cover for the PDI, begin by releasing the tape holding the cover to the rear quarter glass. Open the driver s door and unclip the retainers holding the cover to the rocker and B pillar. Pull the inner part of the cover out of the door area. Fold the cover from both sides and roll it toward the front of the vehicle. Removing the cover from the hood. To release the hood portion of the cover, with the hood open, pull the cover from below the front fascia. Release the cover from the hood stops. Lift it up and over the hood. Leave the cover attached to, and resting on the windshield. Release the center clip and the Velcro fasteners on the rear corners of the hood and release the cover from the hood striker. Starting at one of the front corners, slip the cover off the hood. Pull the cover off the rear corners to remove it from the vehicle. Simply reverse this procedure to reinstall the cover to protect the painted surface of the vehicle during storage. TIP: To avoid paint damage, do not install the transportation cover on a dirty vehicle surface. To remove the cover completely, gently pull the tape from the windshield. Fold the tape back onto the cover to prevent the cover from sticking together. Place both sections of the cover in the vehicle for the customer. To watch a video of the removal of the ELR transportation cover, check out the March 2014 Emerging Issues seminar, D (U.S.). Thanks to Chuck Wieseckel Results of 2013 North American Technician Survey continued from page 5 Service bulletins ranked the highest satisfaction with technicians. Wiring diagrams and online information ranked somewhat lower. Interestingly, service managers consistently have higher satisfaction with service information than technicians do. Critical Factors Two of the most critical factors revealed by this study are these: Dealerships need to focus on creating a career path for technicians. Otherwise, technicians may become frustrated and leave the industry. Communication between service consultants and technicians needs to improve, to ensure that they work as a unified team. Thanks to Diana Sancya 6 April 2014

7 ELR Door Glass Adjustment There may be a wind noise condition on some 2014 ELRs related to the driver s or passenger s door glass. Following are some guidelines to help identify a leak and to properly adjust the door glass on the ELR. Before beginning any adjustments: Take a road test at speeds above 35 mph to verify the wind noise condition. Confirm that the body door opening weatherstrip is firmly seated in the channel, especially on the horizontal edge. Inspect for a tight, flush joint where the front quarter glass weatherstrip meets the door glass weatherstrip. Proper door glass fit can be verified by closing the door and allowing the glass to index. The top of the glass should be pushed up into the weatherstrip. Measure Door Glass Position If the leak appears to be located at the top of the glass, or the weatherstrip is not wrapped around the glass when it s closed, use a marker and tape to measure the door glass position. The top edge of the glass to Measure the door glass position. the mark on the tape should be 5 millimeters, +/- 2 millimeters. Also measure the gap between the rear of the door glass and the quarter glass. It should be 10 millimeters, +/- 1.5 millimeters. The gap measurements should be fairly even top to bottom, within 1.5 millimeters. If the wind noise is at the front of the glass, Leak Trace Powder can be used to verify that the glass is properly contacting the weatherstrip when closed. Any gaps in the powder may indicate poor contact between the glass and weatherstrip. TIP: Cover the suede portion of the door trim panel when using Leak Trace Powder. The powder is very difficult to remove from this material. Glass Adjustment To adjust the glass, remove the door trim panel following the appropriate Service Information. Make alignment marks for the rear edge of the door glass by placing tape on the weatherstrip Door glass alignment marks between the door glass and the quarter glass. Mark the tape 10 millimeters from the forward edge of the quarter glass in two places. Next, make alignment marks for the top of the glass by placing two pieces of tape along the top of the door glass (one approximately over each of the window regulator channels) and mark each Adjust the door glass to the alignment marks. piece of tape five millimeters from the edge of the glass. Remove the two plastic plugs behind the upper corners of the water deflector to access to the window regulator nuts. Loosen both upper regulator channel nuts about one half turn to allow adjustment. With the door closed and the glass indexed up, have an assistant outside the vehicle move the glass into alignment. The rear edge of the glass should be aligned with the marks on the tape between the door and quarter glass and the top edge of the glass should be aligned with the tape marks at the door opening reveal molding. Once the glass is properly aligned, tighten the regulator nuts. Open and close the door to check alignment and readjust if necessary. Torque the regulator nuts to specification and reinstall the plastic plugs. TIP: Before reinstalling Window regulator nuts the trim panel, the retaining clips should always be replaced. If they are not, the panel may become loose over time. Match the clip color to the proper location. Window Motor Relearn Procedure After adjusting the glass, it is necessary to perform the window motor relearn procedure using GDS 2. After exiting the scan tool learn procedure completely, the window motor must be normalized in order to perform the express up and express down functions. With the door closed and the window in the fully raised position, press and hold the power window switch until the window is fully open. Continue holding the switch down for an additional five seconds. Next, pull up the power window switch until the window is fully closed. Again, continue holding the switch up for an additional five seconds. For more information about ELR door glass adjustments, view the March 2014 Emerging Issues seminar, D (U.S.). In Canada, see the April 2014 TAC Talk program. Thanks to Chuck Wieseckel April

8 HVAC Temperature Fluctuations On some 2014 Corvettes built prior to November 15, 2013 the HVAC temperature may fluctuate more than expected when the set temperature is changed by only a few degrees or less. A minor change in the set temperature may cause the HVAC system to blow warmer or cooler than desired. Do not replace parts for this condition. A revised HVAC control module calibration has been released to provide an improvement to this condition. Determine the build date of the vehicle in order to confirm which module(s) require an update. If the build date is November 5, 2013 or later, update the HVAC control module. If the build date is prior to November 5, 2013, determine if the latest version of #PI1101 (labor operation code ) has been performed. If the latest version of #PI1101 has been performed, update only the HVAC control module. If the latest version of #PI1101 has not been performed, perform the procedure as instructed. Submit a warranty transaction for #PI1101 only. The revised HVAC control module calibration will improve the condition noticeably, but if there are still concerns after the calibration has been updated, there are settings that can be made to further improve the operation. In the Vehicle Settings menu, set the Auto Fan Max Speed to Low or Medium instead of High. Go to Vehicle > Climate and Air Quality > Auto Fan Max Speed. By selecting a reduced Climate and Air Quality menu blower speed, the system will have smoother temperature changes as it attempts to adjust the temperature in the car. It is vital to the operation of the system that all programming events be completed as instructed in the appropriate module Programming and Setup documents. System operation will not improve if procedures are not completed as instructed in the Service Information. Thanks to Jeremy Richardson eassist Battery Module and Battery Exchange Process Update The Drive Motor Generator Battery Module (Powerpack) and Drive Motor Generator Battery exchange process for the LaCrosse and Regal, Malibu Eco, and 2014 Impala with eassist has been updated. The exchange program is designed to gain important feedback on the Drive Motor Generator Control and Battery Module Assembly or Battery sections regarding service diagnostics, repair procedures, and accelerated root cause analysis for continuous improvements. Please review all of the information provided in #PIC5520K prior to contacting the Technical Assistance Center (TAC). This information covers parts information, storage guidelines, shipping preparations, and shipping instructions. TIP: Do not attempt to reprogram software or clear any DTCs prior to capturing data and calling TAC. Always perform the High Voltage Disabling procedure prior to servicing any high voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. 16-digit Battery Identification Number It will be necessary to have the 16-digit Battery Identification Number (BIN), located on the side of the battery module assembly cover. After obtaining a case number and authorization through TAC, the TAC Consultant will call the dealership s local Electronic Service Center (ESC) to order the Drive Motor Generator Battery Module or Drive Motor Generator Battery Sections 1 and 2. Thanks to Brian Ciaverella 8 April 2014

9 Incorrect Remote Control Door Lock Receiver On some 2014 Cruze models, the doors may not unlock intermittently when pressing the door handle buttons (equipped with Passive Entry), the vehicle may not start when pushing the Start button (equipped with Passive Start), or the key fob will work only until the Body Control Module (BCM) goes to sleep (10-30 minutes). The physical key can be used to unlock the door if locked. In some cases, these conditions may be caused by the incorrect K77 Remote Control Door Lock Receiver (RCDLR) installed during the vehicle build process. Verify the correct K77 RCDLR is installed. Check for the following part numbers. Vehicles equipped with Passive Entry/ Passive Start (PEPS), RPO ATH and BTM: part number (Black Dot) Vehicles not equipped with PEPS: part number (No Black Dot) If the incorrect RCDLR is identified in the vehicle, install the correct module. Thanks to Christopher Hightower Part Number (Black Dot) Part Number (No Black Dot) Rear Toe Adjust Link Dampener Lacrosse models equipped with the 4-link rear suspension (RPO GNC) built prior to February 19, 2014 have a dampener on the rear toe adjust link. GM Engineering has determined that this dampener does not make a noticeable impact on noise, vibration, or harshness and it has been eliminated from production. If making a repair on a vehicle and this dampener has been damaged or needs to be replaced, remove the dampener and washer and replace it with a shorter bolt (GM P/N ). The nut remains the same. Discard the factoryinstalled dampener and washer. It is acceptable to have a dampener on only one side only of the rear suspension if the other side is unaffected by the repairs. Dampener on the rear toe adjust link Thanks to Christopher Crumb Shorter bolt without the dampener and washer Stop Lamp and Turn Signal Lamp Options For some Express and Savana Cutaway Vans, there may be some confusion regarding the proper operation of the stop and/or turn signals. This may lead to difficultly diagnosing a stop and/or turn signal condition. The BCM can be calibrated for Separated Stop/Turn Signal Circuits, RPO V4D. Without RPO V4D The stop and turn signals are one lamp (same bulb). Traditionally, there will be one red stop/turn signal lamp per side. Without RPO V4D: Circuit 618 Yellow (X405 terminal D) is for the left stop and turn signal. Circuit 619 Dk Green (X405 terminal E) is for the right stop and turn signal. With RPO V4D The stop and turn signals are separate lamps (two different bulbs). Traditionally, there will be one red stop lamp and one amber turn signal lamp per side. RPO V4D is included with the Ambulance Package (RPO YF2), School Bus Package (RPO B3D) and Shuttle Bus Package (RPO ANC). With RPO V4D: Circuit 618 Yellow (X405 terminal D) is for the left turn signal only. Circuit 619 Dk Green (X405 terminal E) is for the right turn signal only. Circuit 1320 light blue (X405 terminal C) is for the stop lamps only. If the vehicle is upfitted and the body does not support the way the BCM is calibrated for the stop/turn signal setup, contact the Techline Customer Support Center for a new BCM calibration to either remove or add the RPO V4D option. Thanks to Scott Fibranz April

10 Power Memory Seat Operation The power driver s seat with memory recall and Easy Exit recall operations on some 2014 Corvettes (with the Memory Package, RPO AAB) may seem to operate erratically or intermittently. To help with diagnosis, it s necessary to become familiar with the operational characteristics of this all-new system. Memory recall buttons Some common comments include: The seat won't recall when entering the vehicle The seat only moves when holding one of the memory buttons (button 1, 2 or the Exit button) The seat stops moving when releasing a memory button Sometimes the seat moves completely to the stored position by pressing and releasing a memory button Seat Travel Limit Switches Bulkhead Limit Switch located on the left and right body harness conduit. The new Bulkhead Limit Switch, located on the left and right body harness conduit, is used in both seating positions and acts to prevent damage to the body harness and seatback covers when the seat or seatback is moved in a rearward direction. When this switch is active (any time pressure is detected against the rear bulkhead/carpet area directly behind the seats), power seat movement is limited to movements that will bring the seat/seatback forward. The new Seatback Unlock Switch, located inside the seatback assembly at the recliner mechanism, is used in both seat positions to prevent the seat from moving further rearward to ensure that the seatback can return to the normal upright position. When this switch is active (any time the seatback is manually folded forward), power seat movement is limited to movements that will bring the seat/seatback forward. Both of these switches are viewable with the GDS2 scan tool. Common reasons for the Bulkhead Limit Switch being active are if the Easy Exit setting is stored in a position that applies pressure to the rear bulkhead or if an object is behind the seatback. Supervised and Unsupervised Movements Unlike prior models, the new system features unsupervised and supervised modes. Unsupervised movement occurs when the operator has pressed and released, within 1/2 second, a memory button, which allows the seat to move on its own to a previously stored position. TIP: Pressing any power seat button or memory button during unsupervised movement stops the seat. To resume recall operation, press and release, within 1/2 second, the desired memory button again. Depending on transmission type, unsupervised movement will occur if: Automatic transmission The vehicle ignition is on, the transmission is in Park, and the Bulkhead Limit Switch Seatback and Unlock Switch are both inactive. Manual transmission The vehicle igntion is on, the clutch is depressed, the Parking Brake is applied, and the Bulkhead Limit Switch and Seatback Unlock Switch are both inactive. Supervised movement occurs when a memory button is actively pressed and held, which allows the seat to move only while the operator is supervising the seat movement. Releasing the memory button will stop the seat movement. Only supervised memory recall operation can occur when the vehicle ignition is not in the On/ Run Position. If the Bulkhead Limit Switch or Seatback Unlock Switch is active, either no operation will occur or supervised operation will occur, depending on which switch is active and the requested direction of seat travel. Auto Memory Recall The new memory seat system allows the operator to enable or disable the Auto Memory Recall operation of the seat. Auto Memory Recall is when the seat moves to a previously stored position either when opening the driver s door or when the vehicle igntion is turned on. In order for auto recall to function, the feature must be turned on in the Settings menu of the infotainment system. The operation of Auto Memory Recall is based on transmission type: At Driver s Door Open (Automatic transmission) When the vehicle ignition is off and the Unlock key fob button is pressed, auto recall will occur if the driver s door is opened with four minutes. The seat position will be recalled to the set position if the Bulkhead Limit Switch or Seatback Unlock Switch is inactive. If the driver s door is already open, pressing the Unlock key fob button will cause the seat to recall to the desired position if the Bulkhead Limit Switch or Seatback Unlock Switch is inactive. At Ignition On (Automatic transmission) When the vehicle ignition button is pressed, the seat position will be recalled to the set position without a memory button being pressed if the Bulkhead Limit Switch or Seatback Unlock Switch is inactive. Manual transmission The only available selection is on or off. If turned on, when the vehicle ignition is off and the driver s door is opened, the seat position will be recalled to the set position if the Bulkhead Limit Switch or Seatback Unlock Switch is inactive. Easy Exit The new memory system also allows the operator to enable or disable the Easy Exit Automatic Recall operation of the driver's seat. This feature recalls the current driver s previously stored Exit button position when exiting the vehicle. In order for the Easy Exit feature to function, it must be turned on in the Settings menu of the infotainment system. Easy Exit recall automatically activates when one of the following occurs: The vehicle is turned off and the driver s door is opened within a short time. The vehicle is turned off with the driver s door open. The Exit button is pressed. TIP: Similar to Auto Memory Recall, the operation of the Easy Exit recall will differ based on Transmission type. Refer to the Supervised/Unsupervised Movements section. Thanks to Jeremy Richardson 10 April 2014

11 Windshield Pop Noise during Cold Temperatures GM TechLink is published for all GM retail technicians and service consultants to provide timely information to help increase know ledge about GM products and improve the performance of the service department. Publisher: John Meade GM Customer Care and Aftersales Editor: Lisa G. Scott GM Customer Care and Aftersales Technical Editor: Mark Spencer Production Manager: Marie Meredith Graphic Design: 5by5 Design LLC FAX number: Write to: * TechLink PO Box 500 Troy, MI GM TechLink on the Web: : GM GlobalConnect General Motors service tips are intended for use by professional technicians, not a do-it-yourselfer. T hey are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the information applies to your vehicle or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information. Inclusion in this publication is not necessarily an endorsement of the individual or the company. Copyright 2014 General Motors All rights reserved. Some Enclave, Traverse and Acadia models May exhibit a pop- or itch-type noise at the windshield area while driving. If the noise is coming from the upper windshield area, the condition may be caused by the windshield alignment pins in the upper corners of the glass, five inches from the edge of the glass. Removal of the windshield is not necessary to remove the alignment pins. Perform a road test to verify the condition. If the noise is heard in the area surrounding the upper windshield area, have an assistant push on the windshield alignment pins with a trim stick. If the noise changes or is gone, remove the windshield alignment pins. If the condition cannot be verified, inspect the windshield alignment pins for rub/wear marks. If rub/ wear marks are present, the pins will need to be removed. The windshield alignment pins are in the upper corners of the glass. To access the alignment pins, lower the front of the headliner and remove the windshield garnish molding. Next, remove the sunshade and anchors as well as the roof console assembly. To remove the windshield alignment pins, slide a trim stick between the windshield and the alignment pin to separate the alignment pin from the windshield. It may be necessary to pull down on the body alignment hole to get the pin out. Thanks to Jim Miller Service Know-How Inspect the windshield alignment pins for rub/wear marks. Use a trim stick to separate the alignment pin from the windshield D Emerging Issues April 10, 2014 To view Emerging Issues seminars: Log in to Select Resources, and then Video on Demand; or Select Catalog to search for the course number, and then select View > Take or Continue Course April

12 Car Issues Fix It Right the First Time Model Year(s) Vehicle Line(s)/Condition Do This Don t Do This 2014 Sierra, Silverado, Impala, Corvette, SRX, XTS, CTS Sedan, ATS, Regal, LaCrosse No XM audio, rear view camera issues, favorite stations stored twice and/or disappear 2013 Malibu, Regal, LaCrosse Fuel gauge does not read full, only goes to 7/8 full Reference Information/ Bulletin Radio reprogramming with SPS Replace the tuner or the radio for this concern PI1159B On listed models only, install new design fuel level sensor kit and fuel fill shutoff valve Install components on other model vehicles, replace fuel tank, replace fuel pump module, replace Engine Control Module PI1161A 2013 ATS, Malibu Engine rough run with Check Engine Light (CEL) on/low compression on cylinder with misfire, DTC P0300 set Trax, Encore AWD OFF message displayed in DIC or CODE 73 or CODE 173 illuminated in DIC Replace 4 pistons and rings Replace engine assembly PI1178 Reprogram AWD module w/new cal Replace AWD module PI ATS, CTS Mobile telephone microphone poor performance Secure the wire harness and install foam patch Replace the microphone PI1162A ATS Battery access cover and rear fuse block cover available for service use Replace only the battery access cover or the rear fuse block access cover if needed. These parts are now released separately from the quarter trim assembly Replace the entire left quarter rear compartment trim assembly if only a cover is needed PI Spark, Sonic, Trax, Encore, Cruze Vehicle slow to heat up in cold ambient temperatures Run normal diagnostics for DTCs. Do not replace parts unless diagnostic indicates a replacement is needed. Explain to the customer that during extreme cold ambient conditions these high efficiency engines take longer to warm up Replace the thermostat if there are no DTCs PI1166A Sonic, Cruze Engineering Information - Intermittent reduced engine power with no DTCs Call TAC for further direction for handling these loss of power cases with no DTCs set Perform any repair for loss of power with no DTCs set PIE All Lines Refinishing aluminum wheels Refinish painted aluminum wheels Replace wheels F ATS, CTS Sedan, Camaro Malfunction Indicator Lamp flashes due to engine misfire on acceleration, DTC P0300 and/ or P0303 set Performed published calibration update in bulletin Misfire at engine speeds RPM, do not replaced, spark plugs, ignition coils, fuel injectors PI1122B Truck Issues Fix It Right the First Time Model Year(s) Vehicle Line(s)/Condition Do This Don t Do This Terrain, Equinox Creak or pop type noise coming from windshield area during cold ambient temperatures Apply a liberal amount of GM Super Lube around the exterior windshield molding and the lower foam seal on the inside of the windshield glass Replace the windshield Reference Information/ Bulletin PI1120A 2014 Silverado, Sierra Front seat lateral movement and/or click type noise while driving Add retainers, shims or clips to repair Replace seat adjuster, seat frame, cushion or pan PI Traverse, Acadia, Enclave Service All Wheel Drive message displayed on DIC, DTC U0136 set Reprogram RDM, even if it has been performed previously Replace the RDM PI1074B Customer Care and Aftersales 12 April 2014