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 B3140 00: Driver Unlock Switch CircuitDTC B3150 00: Driver Lock Switch Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
I/P Fuse Block B+ | 1 | 1 | -- | -- |
Left Lock Switch Signal | B3150 00 | B3150 00 | B3150 00 | -- |
Left Unlock Switch Signal | B3140 00 | B3140 00 | B3140 00 | -- |
Door Latch Control | 1 | 1 | 1 | -- |
Doors Unlock Control | B3130 00 | B3130 00 | B3130 00 | -- |
LF Door Unlock Control | B3125 00 | B3125 00 | B3125 00 | -- |
Doors Locked Control | B3135 00 | B3135 00 | -- | -- |
Door Lock Switch Ground | -- | 1 | 1 | -- |
I/P Fuse Block Ground | -- | 1 | 1 | -- |
1. Door Lock Mlafunction | ||||
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 senses a door lock/unlock switch activation or a keyless entry lock or unlock command.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
B3140 00
The BCM detects a fault in the left unlock switch signal circuits.
B3150 00
The BCM detects a fault in the left lock switch signal circuits.
Action Taken When the DTC Sets
The driver door lock switch 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
Ignition ON, observe the scan tool Rear Doors Lock Cmd and Rear Doors Unlock Cmd parameters while using the driver door lock switch. The parameter should change between On and Off when changing between the commanded states.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Test for less than 1 ohm between the ground circuit terminal 2 and ground.
- Ignition ON, verify the scan tool Rear Doors Lock Cmd parameter is Off.
- Verify the scan tool Rear Doors Unlock Cmd parameter is Off.
- Install a 3A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Rear Doors Lock Cmd parameter is On.
- Install a 3A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Rear Doors Unlock Cmd parameter is On.
- If all circuits test normal, test or replace the driver door lock switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit terminal 3 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the driver door lock switch.
- Test for infinite resistance between the signal terminals 3 and 1 and the ground terminal 2 with the switch in the open position.
- Test for less than 2 ohms between the signal terminal 3 and the ground terminal 2 with the switch in the unlock position.
- Test for less than 2 ohms between the signal terminal 1 and the ground terminal 2 with the switch in the lock position.
| ⇒ | If less than the specified value, replace the driver door lock switch. |
| ⇒ | If greater than the specified range, replace the driver door lock switch. |
| ⇒ | If greater than the specified range, replace the driver door lock switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
