• | 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 |
---|---|---|---|---|
Lock Relay and Unlock Relay B+ | 2 | 2 | -- | -- |
Driver Door Lock Switch Lock Signal | B3150 00 | B3150 00 | B3150 00 | -- |
Driver Door Lock Switch Unlock Signal | B3140 00 | B3140 00 | B3140 00 | -- |
Passenger Door Lock Switch Lock Signal | B3155 00 | B3155 00 | B3155 00 | -- |
Passenger Door Lock Switch Unlock Signal | B3145 00 | B3145 00 | B3145 00 | -- |
Driver Door Latch Control | 2 | 2 | 2 | -- |
Door Unlock Relay Control | B3130 00 | B3130 00 | B3130 00 | -- |
Driver Door Relay Unlock Control | B3125 00 | B3125 00 | B3125 00 | -- |
Door Lock Relay Control | B3135 00 | B3135 00 | B3135 00 | -- |
Passenger Door Latch Control | 2 | 2 | 2 | -- |
Driver Door Lock Switch Ground | -- | 1 | 1 | -- |
Lock Relay and Unlock Relay Ground | -- | 2 | 2 | -- |
Passenger Door Lock Switch Ground | -- | 1 | 1 | -- |
1. Door Lock Switch Malfunction 2. Door Latch Malfunction |
The body control module (BCM), upon receipt of a lock switch lock signal, will switch the door lock relay control circuit to battery positive voltage. This will energize the LOCK relay. The remaining unlock relays receive voltage from the underhood fuse block, the BCM upon receipt of a unlock signal or driver door unlock signal will switch the appropriate unlock relay to ground. This will energize the appropriate unlock relay unlocking the appropriate doors.
The system voltage must be between 9-16 volts.
The BCM detects a fault in the driver door unlock control circuit while commanding the DRIVER UNLOCK relay.
The BCM detects a fault in the door unlock control circuit while commanding the UNLOCK relay.
The BCM detects a fault in the door lock control circuit while commanding the LOCK relay.
The power door locks will malfunction.
• | The 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
Power Door Locks Description and Operation
Control Module References for scan tool information
Command the driver door and passenger door latches to LOCK and UNLOCK with the scan tool, the doors should perform LOCK and UNLOCK functions.
⇒ | 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. |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup and programming |