GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the system check?

--

Go to Step 2

Go to Endgate Window Release System Check

2

  1. Press any of the power door lock switches to the unlock position.
  2. Disconnect the rear liftgate release motor.
  3. Use the test lamp J 35616-200 in order to probe CKT 1306 (LT GRN) wire cavity A at the motor connector to ground.
  4. Press the liftgate release switch.

Does the test lamp light?

Go to Step 3

Go to Step 6

3

  1. Use a test lamp J 35616-200 in order to probe CKT 1450 (BLK) cavity B at the rear liftgate release motor connector to CKT 1306 (LT GRN) cavity A.
  2. Press the liftgate release switch.

Does the test lamp light?

Go to Step 5

Go to Step 4

4

Repair the open in CKT 1450 (BLK) between the rear liftgate release motor and G403.

Is the repair complete?

Go to Endgate Window Release System Check

--

5

  1. Replace the rear liftgate release motor. Refer to Liftgate Lock Cylinder Replacement .
  2. Press the liftgate release switch.

Is the repair complete?

Go to Endgate Window Release System Check

--

6

  1. Use a test lamp J 35616-200 in order to backprobe CKT 1306 (LT GRN) wire cavity C3 at the liftgate lock/unlock relay to ground.
  2. Press the liftgate release switch.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

7

Repair the open in CKT 1306 (LT GRN) between the rear liftgate release motor and G403.

Is the repair complete?

--

Go to Endgate Window Release System Check

--

8

  1. Use a test lamp J 35616-200 in order to backprobe CKT 1305 (PPL) wire cavity B2 at the liftgate lock/unlock relay to ground.
  2. Press the liftgate release switch.

Does the test lamp light?

--

Go to Step 12

Go to Step 9

9

  1. Use a test lamp J 35616-200 in order to backprobe CKT 1305 (PPL) wire cavity C of the liftgate lock/unlock release switch connector to ground.
  2. Press the Liftgate release switch.

Does the test lamp light?

--

Go to Step 10

Go to Step 11

10

Repair the open in CKT 1305 (PPL) between the lock/unlock release switch and the liftgate lock/unlock relay.

Is the repair complete?

--

Go to Endgate Window Release System Check

--

11

Replace the liftgate lock/unlock release switch. Refer to Liftgate Lock Cylinder Replacement .

Does the liftgate release switch operate properly?

--

Go to Endgate Window Release System Check

--

12

  1. Disconnect the liftgate lock/unlock relay.
  2. Use a digital multimeter (DMM) J 39200 in order to probe CKT 1450 (BLK) wire cavity B1 at the liftgate lock/unlock relay connector to ground.

Is there continuity?

--

Go to Step 14

Go to Step 13

13

Repair the open in CKT 1450 (BLK) between the liftgate lock/unlock relay and G403.

Is the repair complete?

--

Go to Endgate Window Release System Check

--

14

  1. Connect a test lamp J 35616-200 between CKT 295 (GRY) wire cavity A1 of the liftgate lock/unlock relay and ground.
  2. Press any of the power door lock switches to the LOCK position.

Does the test lamp light?

--

Go to Step 16

Go to Step 15

15

Repair an open in CKT 295 (GRY) between the liftgate lock/unlock relay and splice S335.

Is the repair complete?

--

Go to Endgate Window Release System Check

--

16

  1. Connect a test lamp J 35616-200 between CKT 294 (TAN) cavity C1 of the liftgate lock/unlock relay and ground.
  2. Press any of the power door lock switches to the unlock position.

Does the test lamp light?

--

Go to Step 17

Go to Step 18

17

Replace the liftgate lock/unlock relay. Refer to Body Side Trim Panel Replacement - Right Side

Is the repair complete?

--

Go to Endgate Window Release System Check

--

18

Repair the open in CKT 294 (TAN) between the liftgate lock/unlock relay and splice S334.

Is the repair complete?

--

Go to Endgate Window Release System Check

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