GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The lift window release system does not operate by remote or with the lock cylinder switch.

1

Did you perform the Lift Window Release System Check?

--

Go to Step 2

Go to Liftgate Window Release System Check

2

Is the MIR/LKS fuse (located in the underhood fuse block) open?

--

Go to Step 3

Go to Step 12

3

  1. Disconnect the MIR/LKS fuse.
  2. Disconnect the lock cylinder switch.
  3. Connect a DMM between the lock cylinder switch connector terminal D and ground.

Is a short or low resistance present?

--

Go to Step 4

Go to Step 5

4

Locate and repair a short to ground in CKT 840.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

5

  1. Lock the left front door.
  2. Connect a DMM between the lock cylinder switch connector terminal C and ground.

Is a short or low resistance present?

--

Go to Step 6

Go to Step 7

6

Locate and repair a short to ground in CKT 1221 (WHT/BLK).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

7

  1. Lock the left front door.
  2. Disconnect the lift window release actuator.
  3. Connect a DMM between ground and the lift window release actuator connector terminal A.

Is a short or low resistance present?

--

Go to Step 8

Go to Step 9

8

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

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

9

  1. Disconnect the lift glass relay from the underhood fuse block.
  2. Connect a J 39200 DMM between the lift glass relay connector terminal 3 and terminal 1 to ground.

Is continuity present?

--

Go to Step 10

Go to Step 11

10

Replace the underhood fuse block.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

11

Replace the liftglass relay.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

12

  1. Disconnect the lift window release actuator.
  2. Unlock the left front door.
  3. Connect a J 39200 DMM between the lift window release actuator connector terminal A and ground.
  4. Press and hold the lock cylinder switch.

Is voltage present?

Battery Voltage

Go to Step 15

Go to Step 13

13

  1. Ensure that the left front door remains unlocked.
  2. Ensure that the J 39200 DMM remains connected between the lift window release actuator connector terminal A and ground.
  3. Press and hold the lift window release switch on the IP.

Is voltage present?

Battery Voltage

Go to Step 15

Go to Step 14

14

Locate and repair an open in CKT 56 (BLK/WHT).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

15

  1. Connect a J 39200 DMM between the lift window release actuator connector terminal A and terminal B.
  2. Press and hold the lock cylinder switch.

Is voltage present?

Battery Voltage

Go to Step 17

Go to Step 16

16

Locate and repair an open in CKT 1350 (BLK).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

17

Replace the lift window release actuator.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--