Schematic Reference: Door Lock/Indicator Schematics

DEFINITION: This diagnostic should be used to diagnose a complete failure of the power door lock system (lock, unlock or both). This diagnostic assumes that the system fuse has been checked for an open and that any shorts to ground in the battery positive voltage, door lock/unlock control or door lock actuator lock/unlock circuits have been repaired. If the power door lock system is still inoperative after any shorts to ground have been repaired and the fuse replaced, continue with the diagnosis.

Did you review the Power Door Locks Description and Operation?

Go to Step 2

Go to Symptoms - Doors

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

Did any of the doors lock and unlock from any of the switches?

Go to Power Door Lock Inoperative - Driver Door or Power Door Locks Inoperative - Passenger Door

Go to Step 4

1. Disconnect the door lock relay.
2. Connect a test lamp between the battery positive voltage circuit at the relay connector and a good ground .

Did the test lamp illuminate?

Go to Step 5

Go to Step 11

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 12

1. Connect a test lamp between the door lock control circuit at the relay connector and a good ground.
2. Press a door lock switch to the lock position.

Did the test lamp illuminate?

Go to Step 7

Go to Step 13

1. Connect a test lamp between the door unlock control circuit at the relay connector and ground.
2. Press a door lock switch to the unlock position.

Did the test lamp illuminate?

Go to Step 8

Go to Step 14

1. Reconnect the door lock relay.
2. Backprobe the door lock actuator lock circuit at the relay connector with a test lamp connected to a good ground.
3. Press a door lock switch to the lock position.

Did the test lamp illuminate?

Go to Step 9

Go to Step 15

1. Backprobe the door lock actuator unlock circuit at the relay connector with a test lamp connected to a good ground.
2. Press a door lock switch to the unlock position.

Did the test lamp illuminate?

Go to Step 10

Go to Step 15

Repair the open(s) in the door lock actuator lock and or unlock circuit(s). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Repair the open in the battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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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 16

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Repair the open in the door lock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

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Repair the open in the door unlock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Replace the door lock relay.

Did you complete the repair?

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2