• | 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, 4 | 3, 4 | -- | -- |
Driver Door Latch Control | 1 | 1 | 1 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Lock/Unlock PCB Relay Control | B3130 00 or B3135 00 | B3130 00 or B3135 00 | B3130 00 or B3135 00 | -- |
Rear Door Latch Control | 3, 4 | 3, 4 | 3, 4 | -- |
I/P Fuse Block 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 |
The body control module (BCM) energizes the unlock relay coil through a low side drive control circuit. When the BCM receives an unlock message the door unlock relay control circuit is grounded energizing the unlock relay coil.
• | Battery voltage is between 9-16 volts. |
• | The BCM has attempted to energize the unlock relay. |
The door unlock relay control circuit is shorted to voltage.
The BCM will not attempt unlock operation.
• | This DTC will be current for as long as the fault is present. |
• | When the fault is no longer present, the DTC will be a history DTC. |
• | A history DTC will clear after 50 ignition cycles. |
Door Lock/Indicator Schematics
Vehicle Access Connector End Views
Power Door Locks Description and Operation
Command the rear doors lock to LOCK and UNLOCK with a scan tool, the doors should perform the LOCK and UNLOCK function.
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, programming, and setup |