GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Lock/Indicator Schematics

1

Did you review the Symptoms - Doors and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Doors

2

Operate the door locks. Note which locks operate and which locks do not operate from both the door switch and the remote keyless entry transmitter.

Does the door lock function operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is the LOCK function inoperative from the door switch and the transmitter?

Go to Step 9

Go to Step 4

4

Is the LOCK function inoperative from the transmitter?

Go to Step 10

Go to Step 5

5

Is the LOCK function inoperative from the driver's door lock switch?

Go to Step 11

Go to Step 6

6

Is the UNLOCK function inoperative from the door switch and the transmitter?

Go to Step 24

Go to Step 7

7

Is the UNLOCK function inoperative from the transmitter?

Go to Step 15

Go to Step 8

8

Is the UNLOCK function inoperative from the door switch?

Go to Step 13

Go to Step 24

9

  1. Disconnect the door lock relay.
  2. Test for an open condition in the OG wire between the fuse block and terminal 5 of the door lock relay. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 21

10

Test for an open in the GY/D-GN wire between the door lock relay terminal 1 and the remote control door lock receiver terminal 10. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 23

11

  1. Disconnect the door lock switch.
  2. Momentarily connect a fused jumper from the GY wire to chassis ground.

Did the doors lock?

Go to Step 16

Go to Step 12

12

Test for an open in the GY wire between the door lock relay terminal 6 and the door lock switch. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 24

13

  1. Disconnect the door lock switch.
  2. Momentarily connect a fused jumper from the L-GN wire to chassis ground.

Did the doors unlock?

Go to Step 17

Go to Step 14

14

Test for an open in the L-GN wire between the door lock relay terminal 4 and the door lock switch. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 24

15

Test for an open in the YE/GN wire between the door lock relay terminal 7 and the remote control door lock relay terminal 11. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 25

16

Test for an open in the BK wire between the door lock switch and G301. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 17

17

Replace the door lock switch.

Is the repair complete?

Go to Step 26

--

18

  1. Connect a fused jumper from terminal 3 to terminal 8 on the door lock relay connector.
  2. Momentarily connect a fused jumper from terminal 2 to terminal 5.

Did the doors lock?

Go to Step 24

Go to Step 19

19

Test for an open in the D-BU wire between terminal 3 of the relay and S307. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 20

20

Test for an open in the WH wire between terminal 2 of the relay and S305. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 24

21

Test for an open in the BK wire between G301 and terminal 8 of the door lock relay. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 26

Go to Step 22

22

Inspect for poor connections at the harness connector of the 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 26

Go to Step 18

23

Inspect for poor connections at the harness connector of the remote control door lock receiver. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 24

Go to Step 23

24

Replace the relay.

Is the repair complete?

Go to Step 26

--

25

Replace the remote control door lock receiver.

Is the repair complete?

Go to Step 26

--

26

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3