• | 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 Lock Switch Lock Signal | B3150 00 | 1 | 1 | -- |
Driver Door Lock Switch Unlock Signal | B3140 00 | 1 | 1 | -- |
Passenger Door Lock Switch Lock Signal | B3155 00 | 2 | 2 | -- |
Passenger Door Lock Switch Unlock Signal | B3145 00 | 2 | 2 | -- |
Door Lock Actuator Lock Control | 3 | 3 | 3 | -- |
Door Lock Actuator Unlock Control | 3 | 3 | 3 | -- |
Lock PCB Relay Control | B3135 00 | 3 | 3 | -- |
Unlock PCB Relay Control | 3 | B3125 00, B3130 00 | 3 | -- |
Driver Door Lock Switch Ground | -- | 1 | 1 | -- |
I/P Fuse Block Ground | -- | 3 | 3 | -- |
Passenger Door Lock Switch Ground | -- | 2 | 2 | -- |
1. Driver Door Lock Switch Malfunction 2. Passenger Door Lock Switch Malfunction 3. Door Latch Malfunction |
The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the voltage drop on the signal circuit.
The system voltage must be between 9-16 volts.
The BCM detects a fault in the driver door lock switch lock or unlock signal circuits.
The BCM detects a fault in the passenger door lock switch lock or unlock signal circuits.
The driver or passenger door lock switch 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
Ignition ON, observe the scan tool Driver Door Lock Sw, Psgr Door Lock Sw, Driver Door Unlock Sw and Psgr Door Unlock Sw parameters while using the door lock switches. The parameter should change between Inactive and Active.
⇒ | If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified value, replace the door lock switch. |
⇒ | If greater than the specified range, replace the door lock switch. |
⇒ | If greater than the specified range, replace the door lock switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, programming, and setup |