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 Descriptors
DTC B3125 00: Left Front/Driver Door Only Unlock CircuitDTC B3130 00: All Door Unlock Circuit
DTC B3135 00: All Door Lock Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Door Lock/Unlock Relay B+ | 1 | 1 | -- | -- |
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/Cargo Door Lock Switch Lock Signal | B3155 00 | B3155 00 | B3155 00 | -- |
Passenger/Cargo Door Lock Switch Unlock Signal | B3145 00 | B3145 00 | B3145 00 | -- |
Passenger/Cargo Unlock Relay Control | B3130 00 | B3130 00 | B3130 00 | -- |
Driver Unlock Relay Control | B3125 00 | B3125 00 | B3125 00 | -- |
Door Lock Relay Control | B3135 00 | B3135 00 | B3135 00 | -- |
Cargo Unlock Relay Control | 2 | 2 | 2 | -- |
Door Lock Switch Ground | -- | 3 | 3 | -- |
Door Lock/Unlock Relay Ground | -- | 1 | 1 | -- |
1. All Latches Malfunction 2. Cargo Door Latch Malfunction 3. Door Lock Switch Malfunction | ||||
Circuit/System Description
The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock relays. Voltage is applied to the appropriate relay through the door lock/unlock control circuit when the BCM detects a door lock/unlock switch activation or a keyless entry lock or unlock command.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B3125 00
The BCM detects a fault in the driver door unlock control circuit while commanding the DRV UNLCK relay.
B3130 00
The BCM detects a fault in the door unlock control circuit while commanding the PASS/CARGO UNLCK relay.
B3135 00
The BCM detects a fault in the door lock control circuit while commanding the ALL DOORS LOCK relay.
Action Taken When the DTC Sets
The power door locks will malfunction
Conditions for Clearing the DTC
| • | 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. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Command the driver door and passenger door lock actuators to LOCK and UNLOCK by using the door lock switch, the doors should perform LOCK and UNLOCK function.
Circuit/System Testing
- Ignition OFF, disconnect the X1 and X2 harness connectors at the body fuse block.
- Connect a test lamp between the appropriate control circuit terminal listed below and B+:
- Ignition ON, command the doors to UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the UNLOCK state.
- Connect a test lamp between the control circuit terminal 5 and ground.
- Command the doors to LOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK state.
- If all circuits test normal, replace the body fuse block.
| • | Control circuit terminal 11 |
| • | Control circuit terminal 18 |
| ⇒ | 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 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 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 and open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
