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Power Door Locks Inoperative - Endgate/Liftgate

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Power Door Locks Inoperative - Endgate/Liftgate

Step Action Yes No
Schematic Reference:  Door Lock/Indicator Schematics  
1 Did you perform the Door Systems Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Door Systems 
2 Activate the door lock switches to the lock and unlock positions.
Does the rear lift gate lock actuator lock and unlock?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Disconnect the lift gate lock actuator.
  2. With a test lamp connected to a good ground, probe the door lock actuator lock circuit at the door lock actuator harness connector.
  3. Activate a door lock switch to lock position.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 6 
4
  1. With a test lamp connected to a good ground, probe the door lock actuator unlock circuit at the door lock actuator harness connector.
  2. Activate a door lock switch to unlock position.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 7 
5
  1. Connect a test lamp between the door lock actuator lock and unlock circuits at the door lock actuator harness connector.
  2. Activate a door lock switch to both the lock and unlock positions.
Does the test lamp illuminate in both positions?		 Go to Step 9  Go to Step 8 
6 Test for an open or short to ground in the door lock actuator lock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
7 Test for an open or short to ground in the door lock actuator unlock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
8 Inspect for poor connections at the harness connector of the lift gate module. 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 12  Go to Step 10 
9 Inspect for poor connections at the harness connector of the door lock actuator. 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 12  Go to Step 11 
10
IMPORTANT: Perform the set up procedure for the lift gate module.
Replace the lift gate module. Refer to Rear Electrical Center or Junction Block Replacement in Body Rear End.Did you complete the repair?		 Go to Step 12  -
11 Replace the appropriate door lock actuator. Refer to Lock Actuator Replacement - Front Door .
Did you complete the repair?		 Go to Step 12  -
12 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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