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 one door lock switch or actuator is inoperative fault is present. Do the power door locks operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 | Is the door lock switch the inoperative component? | Go to Step 4 | Go to Step 6
4 | Are both the LOCK and UNLOCK functions inoperative? | Go to Step 10 | Go to Step 5
5 | Is the LOCK function the inoperative function? | Go to Step 11 | Go to Step 12
6 | Is the driver door lock actuator the inoperative component? | Go to Step 7 | Go to Step 8
7 |

1. Disconnect the driver door lock actuator.
2. Connect a test lamp between the driver door lock actuator unlock control circuit and the door lock actuator lock control circuit of the driver door lock actuator electrical connector.
3. Activate a door lock switch to the LOCK and UNLOCK positions.

Does the test lamp illuminate?

Go to Step 16

Go to Step 13

8 |

1. Disconnect the appropriate lock actuator.
2. Connect a test lamp between the lock actuator unlock control circuit and the lock actuator lock control circuit of the appropriate lock actuator electrical connector.
3. Activate a door lock switch to the LOCK position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 14

9 | Activate a door lock switch to the UNLOCK position. Does the test lamp illuminate? | Go to Step 17 | Go to Step 15
10 | Test the battery positive voltage circuit from the LOC/MIRROR fuse to the door lock switch for an open. Did you find and correct the condition? | Go to Step 25 | Go to Step 18
11 | Test the driver door lock switch lock signal circuit for an open or short to battery. Did you find and correct the condition? | Go to Step 25 | Go to Step 19
12 | Test the driver door lock switch unlock signal circuit for an open or short to battery. Did you find and correct the condition? | Go to Step 25 | Go to Step 19
13 | Test the driver door lock actuator unlock control circuit for an open or short to battery. Did you find and correct the condition? | Go to Step 25 | Go to Step 15
14 | Test the appropriate lock actuator lock control circuit for an open or short to battery. Did you find and correct the condition? | Go to Step 25 | Go to Step 20
15 | Test the appropriate lock actuator unlock control circuit for an open or short to battery. Did you find and correct the condition? | Go to Step 25 | Go to Step 20
16 | Inspect for poor connections at the driver door lock actuator. Did you find and correct the condition? | Go to Step 25 | Go to Step 21
17 | Inspect for poor connections at the appropriate lock actuator. Did you find and correct the condition? | Go to Step 21 | Go to Step 21
18 | Inspect for poor connections at the appropriate door lock switch. Did you find and correct the condition? | Go to Step 25 | Go to Step 21
19 | Inspect for poor connections at the body control module (BCM). Did you find and correct the condition? | Go to Step 25 | Go to Step 23
20 | Inspect for poor connections at the I/P fuse block harness connectors. Did you find and correct the condition? | Go to Step 25 | Go to Step 24
21 | Replace the appropriate lock actuator. Did you complete the repair? | Go to Step 25 | --
22 | Replace the appropriate door lock switch. Did you complete the repair? | Go to Step 25 | --
23 | Replace the BCM. Did you complete the replacement? | Go to Step 25 | --
24 | Replace the appropriate door lock relay. Did you complete the repair? | Go to Step 25 | --
25 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2