GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Safari - 4WD 🢒 Body and Accessories 🢒 Doors 🢒 Power Door Locks Inoperative - All Doors and Switches

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Locks Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2
  1. Disconnect the door lock relay.
  2. Connect a test lamp from CKT 540 (ORN) cavity C at the door lock relay to ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Locate and repair an open in CKT 540 (ORN) between the door lock relay and the I/P fuse block.

Is the repair complete?

--

Go to Step 19

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4

Connect a test lamp from CKT 540 (ORN) cavity C to CKT 1050 (BLK) wire cavity D at the door lock relay.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Locate and repair an open in CKT 1050 (BLK) between the door lock relay and G200.

Is the repair complete?

--

Go to Step 19

--

6
  1. Connect a test lamp from CKT 195 (LT BLU) cavity F at the door lock relay to ground.
  2. Place any inoperative switch in the LOCK position.

Does the test lamp light?

--

Go to Step 9

Go to Step 7

7
  1. Connect a test lamp from CKT 195 (LT BLU) at the inoperative lock switch to ground.
  2. Place the inoperative switch in the lock position.

Does the test lamp light?

--

Go to Step 8

Go to Step 12

8

Locate and repair an open in CKT 195 (LT BLU) between the inoperative lock switch and the door lock relay.

Is the repair complete?

--

Go to Step 19

--

9
  1. Connect a test lamp from CKT 194 (WHT) cavity A at the door lock relay to ground.
  2. Place the inoperative lock switch in the UNLOCK position.

Does the test lamp light?

--

Go to Step 15

Go to Step 10

10
  1. Connect a test lamp from CKT 194 (WHT) at the inoperative lock switch to ground.
  2. Place the inoperative lock switch in the UNLOCK position.

Does the test lamp light?

--

Go to Step 11

Go to Step 12

11

Locate and repair an open in CKT 194 (WHT) between the inoperative lock switch and the door lock relay.

Is the repair complete?

--

Go to Step 19

--

12

Connect a test lamp from CKT 640 (ORN) at the inoperative switch to ground.

Does the test lamp light?

--

Go to Step 13

Go to Step 14

13

Replace the inoperative switch. Refer to Power Accessory Switch Panel Replacement .

Is the repair complete?

--

Go to Step 19

--

14

Locate and repair an open in CKT 640 (ORN) between the I/P fuse block and the inoperative switch.

Is the repair complete?

--

Go to Step 19

--

15
  1. Unlock all the doors.
  2. Connect a fused jumper from CKT 540 (ORN) cavity C to CKT 295 (GRY) cavity E.
  3. Connect another fuse jumper from CKT 1050 (BLK) cavity D to CKT 294 (TAN) cavity B of the door lock relay.
  4. Observe the operation of each door lock.

Do all of the doors lock?

--

Go to Step 16

Go to Step 17

16

Replace the door lock relay.

Is the repair complete?

--

Go to Step 19

--

17

Do any of the door lock motors operate?

--

Go to Step 19

Go to Step 18

18

Locate and repair an open in one of the following locations:

    • CKT 294 (TAN) between the door lock relay cavity B and splice S230
    • CKT 295 (GRY) between the door lock relay cavity E and splice S228.

Is the repair complete?

--

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