GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Verify that the power door locks inoperative fault is present.

Does the power door locks system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Are all of the power door locks inoperative from all switches?

Go to Step 4

Go to Step 5

4

Test for a poor connection or an open in the DR LK fused battery positive voltage supply circuit of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 9

5

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Door Unlock Switch parameter in the BCM data list.
  4. Activate the driver door lock switch to the UNLOCK position.
  5. Activate the front passenger door lock switch to the UNLOCK position.

Does the scan tool display Active for both switches?

Go to Step 7

Go to Step 6

6

  1. Turn OFF the ignition.
  2. Disconnect the inoperative door lock switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Door Unlock Switch parameter in the BCM data list.
  5. Connect a 3-amp fused jumper wire between the driver door lock switch unlock signal circuit of the inoperative door lock switch harness connector and the ground circuit of the inoperative door lock switch harness connector.

Does the scan tool display Active?

Go to Step 13

Go to Step 8

7

Is the driver door lock the inoperative lock?

Go to Step 10

Go to Step 11

8

Test the ground circuit of the inoperative door lock switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 12

9

Test the door lock actuator lock control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 14

10

Test the driver door lock actuator unlock control circuit of the driver door lock for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 15

11

Test the door lock actuator unlock control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 15

12

Test the driver door lock switch unlock signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 19

Go to Step 14

13

Inspect for poor connections at the harness connector of the inoperative door lock switch. 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 19

Go to Step 16

14

Inspect for poor connections at the harness connectors of the BCM. 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 19

Go to Step 17

15

Inspect for poor connections at the harness connector of the inoperative 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 19

Go to Step 18

16

Replace the inoperative door lock switch. Refer to Door Lock Switch Replacement .

Did you complete the replacement?

Go to Step 19

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17

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 19

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18

Replace the inoperative door lock actuator. Refer to Front Side Door Lock Actuator Replacement or Rear Side Door Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 19

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19

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2