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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Door System, Mirror System & Window System) >> Diagnostic Information and Procedures >> Automatic Door Locks Inoperative >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The door open switches are an integral part of each door lock and are not serviced separately.

Automatic Door Locks Inoperative

Step Action Yes No
Schematic Reference: Interior Lights Schematics
Connector End View Reference: Power Door Systems Connector End Views 
1 Did you perform the Door Systems Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Door Systems 
2 Verify that the automatic door locks are inoperative.
Do the automatic door locks operate normally?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Verify that the automatic door locks feature is enabled. Refer to Vehicle Personalization in Personalization.
Are the automatic door locks enabled?		 Go to Step 4  Go to Vehicle Personalization in Personalization
4 Do the power door locks operate normally? Go to Step 5  Go to Symptoms - Doors 
5
  1. Close all of the doors.
  2. With a scan tool, observe the parameter of each door open switch in the Body Control Module, Data Display, Inputs List:
    • LF Door Open Switch
    • LR Door Open Switch
    • RF Door Open Switch
    • RR Door Open Switch
Does the scan tool display Closed for all doors?		 Go to Step 9  Go to Step 6 
6
IMPORTANT: The door open switch is an integral part of the door lock.
  1. Disconnect the harness connector of the suspect door open switch.
  2. With a scan tool, observe the appropriate door open switch parameter in the Data Display, Inputs list of the body control module (BCM).
Does the scan tool display Closed?		 Go to Step 8  Go to Step 7 
7 Test the door open switch signal circuit of the harness connector for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 9 
8 Inspect for poor connections at the harness connectors of the appropriate door lock. 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 body control 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 11 
10 Replace the appropriate door lock. Refer to Lock Replacement - Front Door  and Lock Replacement - Rear Door .
Did you complete the replacement?		 Go to Step 12  -
11 Replace the body control module. Refer to Body Control Module Replacement in Body Control System.
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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