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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Switch Signal | 1, 2 | 1, 2 | 1, 2 | -- |
Driver Door Latch Assembly Ground | -- | 1, 2 | 1, 2 | -- |
1. Door Lock Malfunction 2. Door Lock Switch Malfunction | ||||
Circuit/System Description
The key cylinder lock/unlock feature will unlock or lock all of the doors when the BCM receives a driver door lock key switch unlock or lock signal for greater than 1 second.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Vehicle Access Connector End Views
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Insert the key into the drivers door lock cylinder, turn the key clockwise and hold for greater than 1 second and turn the key counterclockwise and hold for greater than 1 second. Observe the scan tool Door Cylinder Switch parameters, the reading should change between Lock and Unlock.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver door latch assembly.
- Ignition OFF, test for less than 5 ohm of resistance between the ground circuit terminal 8 and ground.
- Ignition ON, verify the scan tool Door Cylinder Switch parameter is Idle.
- Install a 3-amp fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool Door Cylinder Switch parameter is Lock.
- If all circuits test normal, test or replace the driver door latch assembly.
| ⇒ | 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 9 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the driver door latch assembly.
- Test for infinite resistance between the signal terminal 9 and the ground circuit terminal 8 with the switch in the open position.
- Test for 450-550 ohms between the signal terminal 9 and the ground circuit terminal 8 with the switch in the unlock position.
- Test for less than 2.0 ohms between the signal terminal 9 and the ground circuit terminal 8 with the switch in the lock position.
| ⇒ | If not the specified value, replace the driver door latch assembly. |
| ⇒ | If greater or less than the specified range, replace the driver door latch assembly. |
| ⇒ | If greater than the specified range, replace the driver door latch assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup and programming
