Page 1 of 11 2009 Hummer H2 6.2L Eng 1Search Print Date: SHIFT LOCK CONTROL SYSTEM Repair Instructions Automatic Transmission Shift Lock Control Actuator Replacement Removal Procedure NOTE: After assembling the shift lock actuator, turn the ignition forward but do not start (auxiliary position) and attempt to pull the lever from PARK with and without the brake pedal depressed to verify there is no gear access without the brake pedal depressed. NOTE: Ensure the key cannot be removed from the ignition unless both the shifter is in PARK and the shift knob button has been depressed. 1. Remove the console. Refer to Front Floor Console Replacement. 2. Disconnect the shift lock actuator electrical connector (3).

Page 2 of 11 Fig 1: Identifying Shift Lock Actuator & Electrical Connector Courtesy of GENERAL MOTORS CORP. 3. Shift assembly to LOW position.

Page 3 of 11 Fig 2: Removing/Installing Shift Lock Actuator Courtesy of GENERAL MOTORS CORP. 4. Loosen and remove the screw at the rear of the shifter assembly. 5. Shift the assembly to the NEUTRAL position. 6. Loosen and remove the top screw of the shift lock actuator through the lever slot. 7. Pull lever to the DRIVE position and remove the shift lock actuator. Installation Procedure 1. In the DRIVE position, depress the shift lock actuator button and realign into the shifter lever.

Page 4 of 11 Fig 3: Removing/Installing Shift Lock Actuator Courtesy of GENERAL MOTORS CORP. 2. Push lever to NEUTRAL. CAUTION: Refer to Fastener Caution. 3. Install the top screw through the lever slot. Tighten: Tighten the actuator screw to 1.65 N.m (15 lb in). 4. Shift lever to LOW. 5. Install the screw at the rear of the shifter assembly. Tighten: Tighten the actuator screw to 1.65 N.m (15 lb in). 6. Connect the electrical connector (3).

Page 5 of 11 Fig 4: Identifying Shift Lock Actuator & Electrical Connector Courtesy of GENERAL MOTORS CORP. 7. Install the console. Refer to Front Floor Console Replacement. Diagnostic Information And Procedures DIAGNOSTIC CODE INDEX DIAGNOSTIC CODE INDEX DTC DTC B2705 Description B2705 02: Gearshift Unlock Circuit Short to Ground Diagnostic Starting Point - Automatic Transmission Shift Lock Control

Page 6 of 11 Begin the system diagnosis with the Diagnostic System Check - Vehicle. The Diagnostic System Check will provide the following information: The identification of the control modules which command the system The ability of the control modules to communicate through the serial data circuit The identification of any stored diagnostic trouble codes (DTCs) and their status The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located. DTC B2705 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC B2705 02 Gearshift Unlock Circuit Short to Ground Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Shift Lock Control Solenoid Control Shift Lock Control Solenoid Ground B2705 02 1 2 - - 1 - - 1. Unable to move shift lever with brake level depressed. 2. Shift lever moves without brake pedal depressed. Circuit/System Description The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a battery positive voltage to the solenoid. The BCM utilizes a smart driver to control the voltage supply circuit to the automatic transmission shift lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit. Conditions For Running The DTC The ignition switch is in the ON position. The brake pedal is pressed.

Page 7 of 11 The transmission is in the PARK position. Conditions For Setting The DTC The DTC sets if there is a short to ground in the automatic transmission shift lock control solenoid control circuit. Action Taken When The DTC Sets The BCM will not attempt to enable the voltage supply circuit of the automatic transmission shift lock control solenoid until the next key cycle. Conditions For Clearing The DTC A current DTC B2705 will clear when the malfunction is no longer present and the ignition switch is cycled. A history DTC will clear after 100 ignition cycles with no current DTC active during the 100 ignition cycles. Reference Information Schematic Reference Shift Lock Control Schematics Connector End View Reference Component Connector End Views Description and Operation Automatic Transmission Shift Lock Control Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification Ignition ON, clear the DTC. Observe the scan tool BCM Stop Lamp Relay Command parameter while pressing and releasing the brake pedal. The parameter should change between ON and OFF. If the parameter does not change between the specified values, refer to Stop Lamps Malfunction.

Page 8 of 11 Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid. 2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground. 1. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Install a test lamp between the ground circuit terminal B and the control circuit terminal A. 4. Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as commanded. 1. If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. 2. If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. 5. If the circuit tests normal, replace the transmission control. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Automatic Transmission Shift Lock Control Actuator Replacement Control Module References for BCM replacement, setup, and programming Symptoms - Automatic Transmission Shift Lock Control IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true: 1. There are no DTCs set. 2. The control modules can communicate via the serial data link. 2. Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Transmission Shift Lock Control Description and Operation. Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control. Refer to Checking Aftermarket Accessories.

Page 9 of 11 Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections Symptom List Refer to a symptom diagnostic procedure in order to diagnose the symptom: Transmission Control Lever Malfunction Transmission Control Lever Malfunction Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Shift Lock Control Solenoid Control Shift Lock Control Solenoid Ground B2705 02 1 2 - - 1 - - 1. Unable to move shift lever with brake level depressed. 2. Shift lever moves without brake pedal depressed. Circuit/System Description The body control module (BCM) controls the shift lock solenoid by providing battery voltage to the shift lock control solenoid. The BCM utilizes a smart driver to control the voltage supplied to the shift lock solenoid. The smart driver monitors the voltage and current flow of the control circuit. Reference Information Schematic Reference Shift Lock Control Schematics Connector End View Reference Component Connector End Views Description and Operation

Page 10 of 11 Automatic Transmission Shift Lock Control Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Verification Ignition ON, clear the DTC. Observe the scan tool BCM Stop Lamp Relay Command parameter while pressing and releasing the brake pedal. The parameter should change between ON and OFF. If the parameter does not change between the specified values, refer to Stop Lamps Malfunction. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid. 2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground. 1. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Install a test lamp between the ground circuit terminal B and the control circuit terminal A. 4. Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as commanded. 1. If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. 2. If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. 5. If the circuit tests normal, replace the transmission control. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Automatic Transmission Shift Lock Control Actuator Replacement Control Module References for BCM replacement, setup and programming

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