Subject: Upfitter (Aux) Switches (RPO 9L7) Models Affected: Model Years: Date: December 5, 2018 Revision Date: N/A ADVISORY:

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1 Subject: Upfitter (Aux) Switches (RPO 9L7) Models Affected: Model Years: 2019 Chevrolet Silverado Medium Duty 4500/5500/6500 Date: December 5, 2018 Revision Date: N/A ADVISORY: Condition/Concern: For the all-new 2019 Chevrolet Silverado Medium Duty Trucks (4500HD, 5500HD, and 6500HD), built with the regular production option (RPO) 9L7 (auxiliary switch bank), this switch bank on the Silverado Medium Duty (4500/5500/6500 MD) replaces the standard switch bank located just below the Climate Controls (refer to figure 1) and is intended specifically for adding controlled features/functions from inside the cab. These switches are configurable such that they can provide either Battery or Ignition(Run/Crank) 12v+ outputs. The configuration is accomplished by the RELOCATION of two fuses in the both the LH and RH Fuse blocks. The configuration, be it for battery or ignition is done in pairs. Fuse placement will provide either the battery or ignition activation of the output relays for switches 1 and 2 or switches 3 and 4 *, depending on the locations of the two fuses. NOTE: Vehicles can NOT be retrofitted to include this option if not built with it. * Switch 4 is dependent on other vehicle option content that require a user input switch. Bulletin #148 Page 1 December 5, 2018

the cab into the LH IP Junction Block (IECM (X61A)).

2 Switches/Relay outputs: Figure 1 (4 switch configuration shown) The outputs from the switches are located inside the cab into the LH IP Junction Block (IECM (X61A)). Refer to Figure 2 Figure 2 Bulletin #148 Page 2 December 5, 2018

Terminal 1 Location Figure 3 Connector Bottom View Figure 4 Pin #1, 4, 14 and 20 are used for Upfitter added/configured circuits Connector Part Information Harness Type: Upfitter OEM Connector:

3 Terminal 1 Location Figure 3 Connector Bottom View Figure 4 Pin #1, 4, 14 and 20 are used for Upfitter added/configured circuits Connector Part Information Harness Type: Upfitter OEM Connector: (This connector is available through an after-market supplier ) Service Connector: Kit P/N Includes Connector body and Lock Lever Description: 20-Way F 1.5, 2.8 Series (BK) Bulletin #148 Page 3 December 5, 2018

4 Terminal Part Information Terminal Type ID Terminated Lead Diagnostic Test Probe Terminal Removal Tool Service Terminal Tray Core Crimp Insulation Crimp I J (VT) J A II J A (GY) J A C D 9 E A Refer to the connector pin out table for connector and terminal part number information (next page). Available for order at GM dealers dealers need to order on a DRO (Daily Replenishment Order) Bulletin #148 Page 4 December 5, 2018

5 X61A Junction Block - Instrument Panel X7 Pin Size Color Circuit Function/Fuse Rating Terminal Type ID Option Upfitter Provision (30amp) Aux Switch 4 Output I 9L Not Occupied Upfitter Provision (30amp) Aux Switch 3 Output I 9L Not Occupied RD/YE 2340 Battery Positive Voltage (15 amp) I VT/YE 43 Accessory Voltage (10 amp) II GN 5060 Low Speed GMLAN Serial Data II BK 1050 Ground I VT/WH 1939 Run/Crank Ignition 1 Voltage (15 amp) I Not Occupied Upfitter Provision (30amp) Aux Switch 2 Output I 9L Not Occupied RD/YE 2340 Battery Positive Voltage (15 amp) I Not Occupied GN/GY 817 Vehicle Speed Signal (4k PPM) II Upfitter Provision (30amp) Aux Switch 1 Output I 9L7 Note: The yellow shaded terminals are available signals for Upfitter usage. Bulletin #148 Page 5 December 5, 2018

6 Fuse Block-Instrument Panel Left - X51L UI Bulletin #148 NOTE: The RED squared area in Figure 5 reflects the factory default (battery powered) locations for Aux. switches 1 and 2. The BLUE squared area in Figure 5 reflects the reconfigured (Ign. Run/Crank powered) locations for the Aux. switches 1 and 2. To reconfigure switches 1 and 2 to operate only when the ignition is in the Run/Crank mode, simply relocate the 5- amp fuse from location 18 to that of location 5. NOTE: do NOT populate both fuse 5 and fuse 18 locations at the same time. Figure 5 Fuse Block-Instrument Panel Right-X51R Figure 6 NOTE: The RED squared area in Figure 5 reflects the factory default (battery powered) locations for Aux. switches 3 and 4 *. The BLUE squared area in Figure 5 reflects the reconfigured (Ign. Run/Crank powered) locations for the Aux. switches 3 and 4 *. To reconfigure switches 3 and 4 * to operate only when the ignition is in the Run/Crank mode, simply relocate the 5-amp fuse from location 3 to that of location 6. NOTE: do NOT populate both fuse 3 and fuse 6 locations at the same time. Bulletin #148 Page 6 December 5, 2018

7 Wire Harness Pass-thru location UI Bulletin #148 Upfitter Wire Harness Pass-thru Figure 11 Figure 11 shows the location of the upfitter wire harness pass through Bulletin #148 Page 7 December 5, 2018

8 Wiring Schematic Upfitter Provisions at Junction Block - Instrument Panel (9L7) Bulletin #148 Page 8 December 5, 2018

Subject: Upfitter Auxiliary. Chevrolet Silverado GMC Sierra Model Years: 2014 and Beyond Date: October 7, 2013 Revision Date: February 10, 2017

Subject: Upfitter Auxiliary. Chevrolet Silverado GMC Sierra Model Years: 2014 and Beyond Date: October 7, 2013 Revision Date: February 10, 2017 Subject: Upfitter Auxiliary Switches (RPO 9L7) Models Affected: Chevrolet Silverado GMC Sierra Model Years: 2014 and Beyond Date: October 7, 2013 Revision Date: February 10, 2017 ADVISORY: NOTE: THIS BULLETIN