Diagnostic Aids
| • | If the POWER ACCESSORIES fuse is open, the cause could be one of the following: |
| - | A short to ground in the battery positive voltage circuit. |
| - | A short to ground in the door lock relay lock/unlock control circuits. This could open the POWER ACCESSORIES fuse with a lock or unlock switch activation or a keyless entry transmission. |
| - | A short to ground in the door lock actuator lock/unlock control circuits. This could open the POWER ACCESSORIES fuse with a lock or unlock switch activation or a keyless entry transmission. |
| • | If battery positive voltage is detected on either of the door lock relay control circuits without a door lock switch activation or a keyless entry transmission, the cause could be one of the following: |
| - | A short to battery positive voltage in the door lock relay control circuits. |
| - | A stuck active door lock switch. |
| - | A malfunctioning door lock relay. |
| - | A malfunctioning remote control door lock receiver, if equipped. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Door Lock/Indicator Schematics DEFINITION: This diagnostic should be used to diagnose a failure of either lock or unlock functions and also a complete failure of the power door lock system. | |||
1 | Did you review the Power Door Locks Description and Operation? | Go to Step 2 | Go to Symptoms - Doors |
2 | Actuate all door lock switches to both the lock and unlock positions. Did all the doors lock and unlock? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Did any of the doors lock and unlock from any of the switches? | Go to Power Door Locks Inoperative - One Door or Switch or Power Door Lock Inoperative - Driver Door | Go to Step 4 |
4 |
Did the test lamp illuminate? | Go to Step 5 | Go to Step 18 |
5 | Connect a test lamp between the battery positive voltage circuit and the door lock relay ground circuit at the relay connector. Did the test lamp illuminate? | Go to Step 6 | Go to Step 19 |
6 | Connect a test lamp between the door lock relay lock control circuit at the relay connector and a good ground. Did the test lamp illuminate? | Go to Step 10 | Go to Step 7 |
7 |
Did the test lamp illuminate? | Go to Step 8 | Go to Step 21 |
8 | Connect a test lamp between the door lock relay unlock control circuit at the relay connector and ground. Did the test lamp illuminate? | Go to Step 10 | Go to Step 9 |
9 |
Did the test lamp illuminate? | Go to Step 12 | Go to Step 22 |
10 | While monitoring the test lamp still connected to the door lock relay control circuit, disconnect the remote control door lock receiver. Is the test lamp still illuminated? | Go to Step 11 | Go to Step 14 |
11 | While monitoring the test lamp still connected to the door lock relay control circuit, disconnect both door lock switches. Is the test lamp still illuminated? | Go to Step 20 | Go to Step 15 |
12 |
Did the test lamp illuminate? | Go to Step 13 | Go to Step 16 |
13 |
Did the test lamp illuminate? | Go to Step 17 | Go to Step 16 |
14 | Inspect for poor connections at the remote control door lock receiver harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 23 |
15 | Inspect for poor connections at the appropriate door lock switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 24 |
16 | Inspect for poor connections at the door lock relay harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | Go to Step 25 |
17 | Repair the open or short to ground in the door lock actuator lock and or unlock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
18 | Repair the open or short to ground in the battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
19 | Repair the open in the relay ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
20 | Repair the short to battery in the door lock relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
21 | Repair the open or short to ground in the door lock relay lock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 26 | -- |
22 | Repair the open or short to ground in the door lock relay unlock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
23 | Replace the remote control door lock receiver. Refer to Remote Control Door Lock Receiver Replacement Did you complete the repair? | Go to Step 26 | -- |
24 | Replace the appropriate door lock switch. Refer to Door Lock Switch Replacement in Keyless Entry. Did you complete the repair? | Go to Step 26 | -- |
25 | Replace the door lock relay. Did you complete the repair? | Go to Step 26 | -- |
26 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
