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: Driver Unlock Switch Circuit Short to GroundDTC B3145: Passenger Unlock Switch Circuit Short to Ground
DTC B3150: Driver Lock Switch Circuit Short to Ground
DTC B3155: Right Front Lock Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
I/P Fuse Block B+ | 1, 2, 3 | 1, 2, 3 | -- | -- |
Door Latch Control | 1, 2, 3 | 1, 2, 3 | -- | -- |
Doors Unlock Control | B3130 | B3130 | B3130 | -- |
LF Door Unlock Control | B3125 | B3125 | B3125 | -- |
Doors Locked Control | B3135 | B3135 | -- | -- |
Left Lock Switch Signal | B3150 | B3150 | B3150 | -- |
Left Unlock Switch Signal | B3140 | B3140 | B3140 | -- |
Right Lock Switch Signal | B3155 | B3155 | B3155 | -- |
Right Unlock Switch Signal | B3145 | B3145 | B3145 | -- |
Door Lock Switch Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
I/P Fuse Block Ground | -- | 1, 2, 3 | 1, 2, 3 | -- |
1. Door Lock Inoperative 2. Driver Door Unlock Inoperative 3. Door Unlock Inoperative | ||||
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 or B3150
The BCM detects a short to ground in the Left Lock Switch or Unlock Switch signal circuits.
B3145 or B3155
The BDM detects a short to ground in the Right Lock Switch or Unlock Switch signal circuits.
Action Taken When the DTC Sets
| • | The BCM stores the DTC to memory. |
| • | The power door locks will not operate. |
Conditions for Clearing the DTC
| • | This DTC will change from current to history when the fault is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | The technician issues a scan tool CLEAR DTCs command. |
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
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate Door Lock Switch.
- Ignition ON, verify the scan tool Lock Sw is Inactive.
- Verify the scan tool Unlock Sw is Inactive.
- If all circuits test normal, test or replace the appropriate door lock switch.
| ⇒ | 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 terminal D for a short to ground. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the applicable door lock switch.
- Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the open position.
- Test for less than 2 ohms of resistance between the signal terminal D and the ground terminal B with the switch in the unlock position.
- Test for less than 2 ohms of resistance between the signal terminal E and the ground terminal B with the switch in the lock position.
| ⇒ | If less than infinite resistance, replace the applicable door lock switch. |
| ⇒ | If greater than 2 ohms, replace the applicable door lock switch. |
| ⇒ | If greater than 2 ohms, replace the applicable door lock switch |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
