GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Verify that the power door locks are inoperative.

Do the power door locks operate normally?

--

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

Go to Step 3

3

  1. Manually lock the doors.
  2. Press a power door unlock switch.

Did the driver's door unlock?

--

Go to Step 5

Go to Step 4

4

Check the PWR LKS fuse 14.

Is the fuse blown?

--

Go to Step 6

Go to Step 8

5

Check the MIR/LKS fuse.

Is the fuse blown?

--

Go to Step 7

Go to Step 9

6

Test CKT's 1740 (ORN), 694 (TAN), 295 (GRY), and 294 (TAN) for a short to ground. Refer to Circuit Testing in wiring systems.

Is a short to ground present?

--

Go to Step 14

Go to Step 16

7

Test CKT's 840 (ORN), 194 (WHT), and 195 (LT BLU), for a short to ground. Refer to Circuit Testing in wiring systems.

Is a short to ground present?

--

Go to Step 14

Go to Step 16

8

Test CKT 1740 (ORN) for an open. Refer to Circuit Testing in wiring systems.

Was an open present?

--

Go to Step 11

Go to Step 9

9

Test CKT 1850 (BLK) for an open. Refer to Circuit Testing in wiring systems.

Was an open present?

--

Go to Step 13

Go to Step 15

10

Test CKT 840 (ORN) for an open. Refer to Circuit Testing in wiring systems.

Was an open present?

--

Go to Step 12

Go to Step 16

11

Repair the open in CKT 1740 (ORN). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

--

12

Repair the open in CKT 840 (ORN). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

--

13

Repair the open in CKT 1850 (BLK). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

--

14

Repair the short to ground in the appropriate circuit. Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

--

15

Replace the door lock relay.

Is the repair complete?

--

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3