• | 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 |
---|---|---|---|---|
Driver Door Switch B+ | 1 | 1 | -- | -- |
Door Lock Relay B+ | 3,4 | 3,4 | -- | -- |
Door Unlock Relay B+ | 3,4 | 3,4 | -- | -- |
Passenger Door Switch B+ | 2 | 2 | -- | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Door Lock Relay Control | B3808 | B3808 | 3,4 | -- |
Door Unlock Relay Control | B3809 | B3809 | 3,4 | -- |
Liftgate Latch Control | 5 | 5 | 5 | -- |
Rear Door Latch Control | 3,4 | 3,4 | 3,4 | -- |
Door Lock Relay Ground | -- | 3,4 | 3,4 | -- |
Door Unlock Relay Ground | -- | 3,4 | 3,4 | -- |
1. Driver Door Latch Malfunction 2. Passenger Door Latch Malfunction 3. Rear Door Unlock Inoperative 4. Rear Door Lock Inoperative 5. Liftgate Latch Inoperative |
The driver and front passenger power door lock switches are integral components of the driver door switch (DDS) and passenger door switch (PDS). 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) and the liftgate module (LGM). The DDS, PDS and LGM respond to the lock/unlock request by activating there associated power door lock motors to the appropriate direction to lock or unlock the front doors. The BCM is responsible for controlling the left and right rear passenger door lock motors. 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 lock motors will lock or unlock the rear doors.
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
Ignition ON, command the front doors to LOCK and UNLOCK by using the driver and passenger door lock switches, the doors should perform 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 greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the DDS. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the DDS. |
⇒ | 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 DDS. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the PDS. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the PDS. |
⇒ | 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 PDS. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDS or PDS replacement, programming, and setup. |