Schematic Reference: Door Lock/Indicator Schematics

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

Did you perform the Power Door System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Door Systems

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 Locks Inoperative - One Door or Switch

Go to Step 4

1. Install a scan tool.
2. With the scan tool, command the doors to lock and unlock.

Did the doors lock and unlock?

Go to Step 12

Go to Step 5

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

Did the test lamp illuminate?

Go to Step 6

Go to Step 13

Connect a test lamp between the ground circuit at the door lock relay harness connector and B+.

Did the test lamp illuminate?

Go to Step 7

Go to Step 14

1. Connect the door lock relay.
2. Backprobe the door lock relay harness connector with a test lamp connected between the door lock actuator lock circuit and a good ground.
3. Command the doors to lock.

Did the test lamp illuminate?

Go to Step 8

Go to Step 10

1. Backprobe the door lock relay harness connector with a test lamp connected between the door lock actuator unlock circuit and a good ground.
2. Command the doors to unlock.

Did the test lamp illuminate?

Go to Step 9

Go to Step 10

1. Backprobe the door lock relay harness connector with a test lamp connected between the door lock actuator unlock circuit and the door lock actuator lock circuit.
2. Command the doors to lock and unlock.

Did the test lamp illuminate for both the lock and unlock commands?

Go to Step 11

Go to Step 10

Inspect for poor connections at the door lock relay. 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 16

Go to Step 15

Repair the open in the door lock actuator lock or unlock circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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12

Repair the open or short to ground in the battery positive voltage circuit between the CIG LTR fuse and the door lock switches. 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 or short to ground in the battery positive voltage supply circuit between the PWR ACCY circuit breaker and the door lock relay. 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 ground circuit for the door lock relay. 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