For wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .
Scheme 10
| Callout | Component Name |
|---|---|
| 1 | Fuse Block - Left I/P |
| 2 | Instrument Panel |
| 3 | Body Control Module (BCM) |
| 4 | Body Harness to Body Control Module (BCM) |
Body Control Module (BCM) Terminal Identification - C1 Connector Part Information 12177194 6-Way F Metri-Pack 150 Series (NAT) Pin Wire Color Circuit No. Function A RED 2353 Instrument Panel Lamps Dimming Supply Voltage B PPL/WHT 1382 LED Dimming Signal C ORN 4040 Battery Positive Voltage D ORN 1732 Inadvertent Power Courtesy Lamps Supply Voltage E BRN/WHT 230 Instrument Panel Lamps Dimming Control F ORN 2240 Battery Positive Voltage
Body Control Module (BCM) Terminal Identification - C2 Connector Part Information 12110088 24-Way F Micro-Pack 100 Series (GRY) Pin Wire Color Circuit No. Function A1 - - Not Used A2 DK BLU 1796 Steering Wheel Radio Controls Supply Voltage A3 DK BLU 245 Passenger Door Lock Switch Unlock Control - Base TAN/BLK 254 Rear Door Unlock Relay Control (YE9 w/ Crew Cab) A4 PNK/WHT 1970 Headlamp Low Beam Relay Control A5 DK GRN/ WHT 1317 Fog Lamp Relay Control (T96) A6 LT BLU 244 Passenger Door Lock Switch Lock Control - Base GRY/BLK 255 Rear Door Lock Relay Control (YE9 w/ Crew Cab) A7 - - Not Used (YE9) LT GRN 1391 Driver Door Unlock Relay Control - Base A8 WHT 193 Rear Defog Relay Control (C49) A9-A10 - - Not Used A11 RED/WHT 812 12 Volt Reference A12 ORN 1140 Battery Positive Voltage B1 BLK/WHT 1969 Headlamp High Beam Relay Control B2 WHT 1080 Park Lamp Relay Control B3 DK BLU 1353 RAP Supply Voltage B4 LT GRN/BLK 592 DRL Relay Control B5 PPL 359 DRL Off Indicator Control B6 BLK/WHT 1851 Ground B7 BLK 1835 Security System Sensor Low Reference B8 PNK 1348 Headlamp On Indicator Control B9 BLK 28 Horn Relay Control B10 - - Not Used B11 GRY 1056 Dimmer Switch 5V Reference Voltage B12 LT GRN 1037 BCM Class 2 Serial Data
Body Control Module (BCM) Terminal Identification - C3 Connector Part Information 12160778 24-Way F Micro-Pack 100 Series (BRN) Pin Wire Color Circuit No. Function A1-A3 - - Not Used A4 WHT 278 Ambient Light Sensor Signal A5 - - Not Used (CJ3) GRY 1548 Passenger Sunload Sensor Signal - w/ CJ2 A6 YEL 1836 Security System Sensor Signal A7 - - Not Used - Base LT GRN 1011 Remote Radio Control Signal (YE9) A8 DK GRN 588 DRL Switch Signal A9 ORN 192 Front Fog Lamp Switch Signal (T96) A10 - - Not Used A11 PPL 328 Interior Lamp Defeat Switch Signal A12 - - Not Used B1 YEL 710 Class 2 Serial Data B2 GRY/BLK 308 Park Lamp Switch Signal B3-B4 - - Not Used B5 - - Not Used (CJ3) LT BLU/BLK 590 Driver Sunload Sensor Signal - w/ CJ2 B6 BLK/WHT 1851 Ground B7 - - Not Used LT BLU 1059 Steering Wheel Position Sensor Signal - w/ NYS B8 ORN/BLK 2090 Dimming Switch Signal B9 LT GRN 11 Headlamp Dimmer Switch Signal B10 - - Not Used B11 LT BLU 553 Tow/Haul Switch Signal B12 - - Not Used
Body Control Module (BCM) Terminal Identification - C4 Connector Part Information 12110206 24-Way F Micro-Pack 100 Series (LT BLU) Pin Wire Color Circuit No. Function A1 LT GRN 80 Key In Ignition Switch Signal A2 YEL 307 Headlamp Switch Flash to Pass Signal A3 WHT 530 Off/Run/Crank Voltage A4 PNK 39 Ignition 1 Voltage A5 - - Not Used (YE9) BLK/WHT 746 Right Front Door Ajar Switch Signal (Base) A6 DK BLU/ WHT 149 Cargo Lamp Low Control A7 LT BLU 1134 Park Brake Switch Signal A8 GRY 1524 Backup Lamp Signal A9-A11 - - Not Used A12 WHT 103 Headlamp Switch Headlamps On Signal B1-B2 - - Not Used B3 YEL 43 Accessory Voltage B4 - - Not Used (YE9) GRY/BLK 745 Left Front Door Ajar Switch Signal - Base B5 - - Not Used (YE9) LT BLU 195 Door Lock Control - Base B6 GRY/BLK 2226 Instrument Panel Lamps Dimmer Switch Low Reference B7 BLK 279 Ambient Light Sensor Low Reference B8 - - Not Used B9 DK BLU/WHT 1495 Courtesy Lamps On Signal B10 - - Not Used (YE9) WHT 194 Door Unlock Control - Base B11-B12 - - Not Used
Body Control Module (BCM) Terminal Identification - C5 Connector Part Information 12177195 6-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A-C - - Not Used D ORN 2140 Battery Positive Voltage E GRY/BLK 690 Courtesy Lamp Control F LT GRN 24 Backup Lamp Supply Voltage
Body Control Module (BCM) Terminal Identification - C6 Connector Part Information 12191375 16-Way F Micro-Pack 100 Series (PPL) Pin Wire Color Circuit No. Function A1 - - Not Used A2 LT GRN/BLK 748 Right Rear Door Ajar Switch Signal (Crew Cab) A3 LT BLU/BLK 747 Left Rear Door Ajar Switch Signal (Crew Cab) A4 - - Not Used A5 - - Not Used - Base LT BLU 2265 Power Window Lockout Left Rear Control - Uplevel (YE9 w/ Crew Cab) A6 - - Not Used - Base LT GRN 2266 Power Window Lockout Right Rear Control (YE9 w/ Crew Cab) A7 - - Not Used - Base GRY/BLK 1186 Power Window Relay Right Rear Up Control (YE9 w/ Crew Cab) A8 - - Not Used - Base DK GRN 1188 Power Window Relay Right Rear Down Control (YE9 w/ Crew Cab) B1-B6 - - Not Used B7 - - Not Used - Base YEL 1187 Power Window Relay Left Rear Down Control (YE9 w/ Crew Cab) B8 - - Not Used - Base WHT 1185 Power Window Relay Left Rear Up Control (YE9 w/ Crew Cab)
Begin the diagnosis of the body control system by performing the diagnostic system check for the system in which the customer concern is apparent. The diagnostic system check will direct you to the correct procedure for diagnosing the system and where the procedure is located.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 6: This step tests for battery voltage on the signal circuits that are not required.
- 7: This step tests for no battery voltage on the required signal circuits.
- 8: If any ignition switch parameters that should be inactive in the present ignition switch position are active, 2 ignition switch signal circuits may be shorted together.
- 9: This step eliminates open circuits as the cause of the malfunction.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Body Control System Schematics Connector End View Reference: Body Control System Connector End Views DEFINITION: This table is used if the observed vehicle power mode does not match the ignition switch position. IMPORTANT: Open the driver door and leave it open during this test. This will disable the RAP power mode and eliminate this power mode from the power mode parameter list. | |||
| 1 | Install a scan tool. Turn OFF the ignition. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position? | Go to Step 2 | Go to Step 6 |
| 2 | Turn the ignition switch to the UNLOCK position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position? | Go to Step 3 | Go to Step 6 |
| 3 | Turn ON the ignition, with the engine OFF. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position? | Go to Step 4 | Go to Step 6 |
| 4 | IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Turn the ignition switch to the CRANK position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position? | Go to Step 5 | Go to Step 6 |
| 5 | Turn the ignition switch to the ACCY position. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Does the displayed power mode parameter match the actual ignition switch position? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 6 |
| 6 | IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Turn OFF the ignition. Disconnect the PMM. Hold the ignition switch in the position that indicated the incorrect power mode. With a test lamp attached to a good ground, test the PMM ignition switch inputs for voltage. Refer to Body Control System Description and Operation . Is voltage present on only the inputs specified for the ignition switch position? | Go to Step 7 | Go to Step 8 |
| 7 | IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. Hold the ignition switch in the position that indicated the incorrect power mode. With a test lamp attached to a good ground, test the PMM ignition switch inputs for voltage. Refer to Body Control System Description and Operation . Is voltage not present on any inputs specified for the ignition switch position? | Go to Step 9 | Go to Step 11 |
| 8 | Disconnect the ignition switch. Test the PMM ignition switch input circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Test the PMM ignition switch circuits for a short between circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
| 9 | Disconnect the ignition switch. Test the PMM ignition switch input circuits for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
| 10 | Inspect for poor connections and terminal tension at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
| 11 | Inspect for poor connections and terminal tension at the harness connector of the PMM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
| 12 | Replace the ignition switch. Refer to Ignition Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 14 | |
| 13 | IMPORTANT: After replacement of the PMM perform the programming or set up procedure if required. Replace the PMM. Refer to Control Module References .Did you complete the replacement? | Go to Step 14 | |
| 14 | IMPORTANT: The engine may start during this procedure. Turn the ignition OFF after verifying all power modes. Reconnect all disconnected components. With a scan tool, under the Diagnostic Circuit Check menu observe the Class 2 Power Mode parameter. Cycle the ignition switch through all possible positions one at a time. Does the displayed power mode parameter match the actual ignition switch position? | System OK | Go to Step 1 |
| IMPORTANT |
|---|
| Open the driver door and leave it open during this test. This will disable the RAP power mode and eliminate this power mode from the power mode parameter list. |
| IMPORTANT |
|---|
| The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. |
| IMPORTANT |
|---|
| The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. |
| IMPORTANT |
|---|
| The engine may start during this procedure. Turn the ignition OFF after verifying this power mode. |
| IMPORTANT |
|---|
| After replacement of the PMM perform the programming or set up procedure if required. |
| IMPORTANT |
|---|
| The engine may start during this procedure. Turn the ignition OFF after verifying all power modes. |
Power Mode Mismatch
Fail-safe Operation
Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the BCM fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.