GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This symptom will only be present if power is supplied to the endgate/liftgate window release actuator at all times or if a mechanical problem with the latch mechanism exists.

1

Did you perform the Lift Window Release System Check?

--

Go to Step 2

Go to Liftgate Window Release System Check

2

  1. Turn the ignition switch to the ON position. Do not start the engine.
  2. Place the transmission in the PARK position (A/T) or the NEUTRAL position (M/T).
  3. For manual transmission, set the parking brake.
  4. Use the scan tool output control in order to turn monitor the liftglass relay status.

Is the liftglass relay status OFF?

--

Go to Step 6

Go to Step 3

3

  1. Disconnect the rear wiper/washer window switch.
  2. Use the scan tool in order to monitor the liftglass relay status.

Is the liftglass relay status OFF?

--

Go to Step 5

Go to Step 4

4

Locate and repair a short to ground in CKT 1576 (BLK).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

5

Replace the rear window wiper/washer switch.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

6

Disconnect the liftglass relay from the BBEC .

Will the lift glass latch?

--

Go to Step 8

Go to Step 7

7

Locate and repair a short to power in CKT 56 (BLK/WHT).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

8

Inspect CKT 1344 (LT BLU) for a short to ground.

Is a short present?

--

Go to Step 10

Go to Step 9

9

Replace the liftglass relay in the BBEC.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

10

Locate and repair the short to ground in CKT 1344 (LT BLU).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--