• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
I/P Fuse Block B+ | 3 | 3 | -- | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Lock/Unlock Relay Control | B3135 00 | 3 | 3 | -- |
Lock/Unlock Relay Control | B3130 00 | 3 | 3 | -- |
Rear Door Latch Control | 3 | 3 | 3 | -- |
Endgate Lock Actuator Control | 3 | 3 | 3 | -- |
I/P Fuse Block Ground | -- | 3 | 3 | -- |
1. Driver Door Latch Malfunction 2. Passenger Door Latch Malfunction 3. Rear Door/Endgate Latch Malfunction |
The driver and front passenger power door lock switches are integral components of the driver door lock/window switch and passenger door lock/window switch. The switches consist of 2 positions, lock and unlock, and are in the normally open state. When placed in either the lock or unlock positions, the switches provide a direct input to there respective door control module. When a power door lock switch is operated to the lock or unlock position, the associated door control module responds by sending a serial data message indicating a change in the switch's position. This serial data message is received by the opposite door control module as well as the body control module (BCM). The driver door lock/window switch and passenger door lock/window switch respond to the lock/unlock request by activating their associated power door lock motors to the appropriate direction to lock or unlock the front doors. The BCM is responsible for controlling the left rear door latch, right rear door latch and for the endgate lock actuator. The BCM, upon receipt of a lock or unlock serial data signal, will control either the rear door lock or unlock relay. When the appropriate door lock relay is energized, the rear power door latches and endgate lock actuator will lock or unlock the rear doors and endgate.
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
Command the doors to LOCK and UNLOCK by using the driver and passenger door lock switches, each door should perform the LOCK and UNLOCK function from each switch.
⇒ | If the driver door does not LOCK or UNLOCK, refer to Driver Door Lock Malfunction. |
⇒ | If the passenger door does not LOCK or UNLOCK, refer to Passenger Door Lock Malfunction |
⇒ | If a rear door does not LOCK or UNLOCK, refer to Rear Door Lock Malfunction. |
⇒ | If liftgate does not LOCK or UNLOCK, refer to Liftgate Locks Malfunction. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the driver door lock/window switch. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the driver door lock/window switch. |
⇒ | If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the driver door lock/window switch. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the passenger door lock/window switch. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the passenger door lock/window switch. |
⇒ | If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the passenger door lock/window switch. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM. |
• | Left rear door latch terminals 2 and 3 |
• | Right rear door latch terminals 5 and 6 |
⇒ | If the test lamp is always OFF, test either control circuit for a short to ground or an open/high resistance. If the circuit tests normal and the circuit fuse is good, replace the I/P fuse block. |
⇒ | If the test lamp is always ON, test either control circuit for a short to voltage. If the circuit tests normal, replace the I/P fuse block. |
⇒ | If the test lamp is always OFF, test either control circuit for a short to ground or an open/high resistance. If the circuit tests normal and the circuit fuse is good, replace the I/P fuse block. |
⇒ | If the test lamp is always ON, test either control circuit for a short to voltage. If the circuit tests normal, replace the I/P fuse block. |
⇒ | If it does not perform as specified, replace the door latch |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM, driver door lock/window switch or passenger door lock/window switch replacement, setup and programming |