Schematic Reference: Door Lock/Indicator Schematics

Connector End View Reference: Vehicle Access Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Activate the front door lock switches to the lock and unlock positions.

Do both rear passenger doors lock and unlock?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is there only one door lock actuator that is inoperative?

Go to Power Door Locks Inoperative - One Door or Switch

Go to Step 4

Are the rear door lock actuators inoperative for both lock and unlock?

Go to Step 6

Go to Step 5

Do the rear door lock actuators lock?

Go to Step 17

Go to Step 12

Is the LOCKS fuse open?

Go to Step 24

Go to Step 7

1. Remove the door unlock relay.
2. Connect a test lamp to a good ground.
3. Probe the door unlock relay coil battery supply voltage circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 27

1. Connect a test lamp to battery positive voltage.
2. Probe the door actuator unlock control circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 10

Go to Step 9

1. Install the rear door unlock relay.
2. Remove the rear door lock relay.
3. Connect a test lamp to battery positive voltage.
4. Probe the door lock actuator lock control circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 11

Go to Step 27

1. Connect a test lamp to battery positive voltage.
2. Probe the rear door unlock relay control circuit.

Does the test lamp illuminate?

Go to Step 22

Go to Step 26

1. Connect a test lamp to battery positive voltage.
2. Probe the rear door lock relay control circuit.

Does the test lamp illuminate?

Go to Step 23

Go to Step 25

1. Remove the rear door lock relay.
2. Connect a test lamp to a good ground.
3. Probe the battery positive voltage circuit (high current) cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 13

Go to Step 27

With the test lamp connected to a good ground, probe the lock relay control circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 22

Go to Step 14

1. Connect a test lamp to battery positive voltage.
2. Probe the lock relay control circuit cavity in the rear fuse block.
3. Activate a door lock switch to the lock position.

Does the test lamp illuminate?

Go to Step 15

Go to Step 22

With the test lamp connected to battery positive voltage, probe the door lock actuator lock control circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 25

Go to Step 16

1. Remove the rear door unlock relay.
2. With the test lamp connected to battery positive voltage, probe the unlock relay ground circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 26

Go to Step 27

1. Remove the rear door unlock relay.
2. Connect a test lamp to a good ground.
3. Probe the battery positive voltage circuit (high current) cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 18

Go to Step 27

With the test lamp connected to a good ground, probe the unlock relay control circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 23

Go to Step 19

1. Connect a test lamp to battery positive voltage.
2. Probe the unlock relay control circuit cavity in the fuse block.
3. Activate a door lock switch to the unlock position.

Does the test lamp illuminate?

Go to Step 20

Go to Step 23

With the test lamp connected to battery positive voltage, probe the door lock actuator unlock control circuit cavity in the rear fuse block.

Does the test lamp illuminate?

Go to Step 25

Go to Step 21

1. Remove the rear door lock relay.
2. With the test lamp connected to battery positive voltage, probe the lock relay ground circuit cavity in the rear fuse block.

Does the test lamp illuminate?

Go to Step 25

Go to Step 27

Test for an open short to ground or short to battery in the door lock relay lock control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 28

Test for an open short to ground or short to battery in the door unlock relay lock control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 28

Test for a short to ground in the door lock actuator lock and unlock control circuits. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 27

Inspect for poor connections at the rear door lock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 29

Inspect for poor connections at the rear door unlock relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 30

Inspect for poor connections at the fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 31

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 33

Go to Step 32

Replace the rear door lock relay.

Did you complete the repair?

Go to Step 33

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Replace the rear door unlock relay.

Did you complete the repair?

Go to Step 33

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Replace the rear fuse block.

Did you complete the repair?

Go to Step 33

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Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the repair?

Go to Step 33

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2