GM Service Manual Online
For 1990-2009 cars only

Power Door Lock Key Cylinder Switches Inoperative Left

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you review the Keyless Entry System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Doors

2

Verify that the LOCK feature is inoperative from the left front lock cylinder.

Are the power door locks inoperative from the left front lock cylinder only?

Go to Step 3

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

3

  1. Disconnect the door lock actuator connector.
  2. Connect a test lamp between terminal 2 and ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 4

4

Repair the open in the RED/WHT wire between the lock cylinder actuator and S501. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

5

Test for an open between the switch terminals 2 and  3 with the lock cylinder in the LOCK position.

Is there an open condition?

Go to Step 7

Go to Step 6

6

Repair the open in the PNK wire between the lock cylinder actuator and S500. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

7

Replace the lock cylinder actuator. Refer to Front Side Door Lock Actuator Replacement .

Is the repair complete?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Power Door Lock Key Cylinder Switches Inoperative Right

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you review the Keyless Entry System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Doors

2

Verify that the LOCK feature is inoperative from the right front lock cylinder.

Are the power door locks inoperative from the right front lock cylinder only?

Go to Step 3

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

3

  1. Disconnect the door lock actuator connector.
  2. Connect a test lamp between terminal 2 and ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 4

4

Repair the open in the PNK wire between the lock cylinder actuator and S226. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

5

Test for an open condition between the switch terminals 2 and  3 with the lock cylinder in the LOCK position.

Did you find an open condition present?

Go to Step 7

Go to Step 6

6

Repair the open in the RED/WHT wire between the lock cylinder actuator and S227. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

7

Replace the lock cylinder actuator. Refer to Front Side Door Lock Actuator Replacement .

Is the repair complete?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Power Door Lock Key Cylinder Switches Inoperative Rear

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you review the Keyless Entry System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Doors

2

Verify that the LOCK feature is inoperative from the rear lock cylinder.

Are the power door locks inoperative from the rear lock cylinder only?

Go to Step 3

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

3

  1. Disconnect the door lock actuator connector.
  2. Connect a test lamp between terminal 2 and ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 4

4

Repair the open in the RED/WHT wire between the lock cylinder switch and S227. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

5

Test for an open condition between the switch terminals 1 and  2 with the lock cylinder in the LOCK position.

Did you test an open condition?

Go to Step 7

Go to Step 6

6

Repair the open in the PNK wire between the lock cylinder switch and S226. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

7

Replace the lock cylinder switch. Refer to Rear Door Lock Replacement .

Is the repair complete?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3