For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Verify that all door locks and switches are inoperative. Do the power door locks operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, command the doors to lock and unlock.

Do the door lock actuators lock and unlock with each command?

Go to Step 4

Go to Step 5

4 | Is the LOCK/MIRROR fuse open? | Go to Step 8 | Go to Step 5
5 | Is the DR LCK fuse open? | Go to Step 9 | Go to Step 6
6 | Test the battery positive voltage circuit of the lock switches for an open or high resistance. Did you find and correct the condition? | Go to Step 11 | Go to Step 7
7 | Inspect for poor connections at the body control module (BCM). Did you find and correct the condition? | Go to Step 11 | Go to Step 10
8 | Repair the short to ground in one of the following driver or passenger door lock switch circuits:

• | Battery positive voltage

• | Passenger door lock switch lock control

• | Passenger door lock switch unlock control

Did you complete the repair?

Go to Step 11

--

9 | Repair the short to ground in one of the following circuits:

• | Driver door lock actuator unlock control

• | Door lock actuator lock control

• | Door lock actuator unlock control

Did you complete the repair?

Go to Step 11

--

10 | Replace the BCM. Did you complete the replacement? | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2