Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B3125 02: Driver Door Only, Unlock Circuit Short to GroundDTC B3130 02: All Unlock Circuit Short to Ground
DTC B3135 02: All Door Lock Circuit Short to Ground
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Door Lock Switch Signal | B3150 00 | B3150 00 | B3150 00 | -- |
Door Unlock Switch Signal | B3140 00, B3145 00 | B3140 00, B3145 00 | B3140 00, B3145 00 | -- |
Driver Door Unlock Control | B3125 02 | 1, 2, 3 | 1, 2, 3 | -- |
Doors Lock Control | B3135 02, 4 | 1, 2, 3 | 1, 2, 3 | -- |
Passenger Doors Unlock Control | B3130 02 | 1, 2, 3 | 1, 2, 3 | -- |
Doors Dead Lock Control | B3797 02 | 1, 2, 3 | 1, 2, 3 | -- |
Door Lock Switch Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
1. Door Lock Malfunction 2. Driver Door Unlock Malfunction 3. Door Unlock Malfunction 4. Fuel Filler Door Release Inoperative | ||||
Circuit/System Description
The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock circuits. Voltage is applied to the appropriate circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.
Conditions for Running the DTC
The system voltage is 9-18 V.
Conditions for Setting the DTC
B3125 02
The BCM detects a short to ground on the driver door unlock control circuit.
B3130 02
The BCM detects a short to ground on the unlock door control circuit.
B3135 02
The BCM detects a short to ground on the door lock control circuit.
Action Taken When the DTC Sets
The power door locks will be inoperative
Conditions for Clearing the DTC
| • | 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. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Circuit/System Verification
Command the driver door and passenger door lock actuators to Lock and Unlock with the scan tool, the doors should perform the Lock and Unlock function.
| ⇒ | If any door will not lock, refer to Door Lock Circuit Malfunction. |
| ⇒ | If any door will not unlock, refer to Door Unlock Circuit Malfunction. |
| ⇒ | If any door will not lock or unlock, refer to Door Lock/Unlock Circuit Malfunction |
Circuit/System Testing
- Ignition OFF, disconnect the malfunctioning door latch connector.
- Connect a test lamp between the appropriate door lock control circuit and the unlock control circuit.
- Command the doors to Unlock with a scan tool. The test lamp should briefly illuminate when commanding the Unlock state.
- If all circuits test normal, test or replace the door latch.
| • | Left hand drive: A23D Door Latch Assembly - Driver terminals 2 and 3. |
| • | Right hand drive: A23D Door Latch Assembly - Driver terminals 7 and 8. |
| • | Left hand drive: A23P Door Latch Assembly - Passenger terminals 7 and 8. |
| • | Right hand drive: A23P Door Latch Assembly - Passenger terminals 2 and 3. |
| • | A23LR Door Latch Assembly - Left Rear terminals 2 and 3. |
| • | A23RR Door Latch Assembly - Right Rear terminals 7 and 8. |
| ⇒ | 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 K9 Body Control Module (BCM). |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM). |
Component Testing
Door Latch Test
- Ignition OFF, disconnect the harness connector at the appropriate door lock assembly.
- Install a 25 A fused jumper wire between the lock control terminal and 12 V. Momentarily install a jumper wire between the unlock control terminal and ground. The door lock should perform the Lock/ Unlock function.
- Reverse the jumper wires; the appropriate door lock should perform the Unlock/Lock function.
| ⇒ | If the function does not perform as specified, replace the door lock. |
| ⇒ | If the function does not perform as specified, replace the door lock. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup and programming |
