GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Sonoma Pickup - 4WD 🢒 Body and Accessories 🢒 Body Rear End 🢒 Liftgate Window Release Switch Inoperative

Step

Action

Value(s)

Yes

No

DEFINITION: The lift window release switch on the rear window wiper/washer switch will not activate the lift window release. The endgate lock cylinder switch or liftgate lock switch operates properly.

1

Did you perform the Lift Window Release System Check?

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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 the liftglass relay to the ON status.

Did the liftglass release operate?

--

Go to Step 10

Go to Step 3

3
  1. Disconnect the liftglass relay.
  2. Use the fused jumper wire in order to short terminal 3 to terminal 5 of the liftglass relay connector.

Did the liftglass release operate?

--

Go to Step 5

Go to Step 4

4

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

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

5

Test the continuity between liftglass relay terminal 1 and terminal 2.

Is continuity present?

--

Go to Step 7

Go to Step 6

6

Replace the liftglass relay.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

7
  1. Install the liftglass relay in the BBEC.
  2. Backprobe a fused jumper wire between the body control module (BCM) connector C2 cavity A6 and ground.

Did the liftglass release operate?

--

Go to Step 9

Go to Step 8

8

Locate and repair an open in CKT 1344 (LT BLU).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

9

Replace the BCM.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

10

Backprobe a fused jumper wire between terminal D and terminal E of the window release switch.

Did the liftglass release operate?

--

Go to Step 11

Go to Step 12

11

Replace the window release switch.

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

12

Backprobe a J 39200 DMM between ground and terminal E of the window release switch.

Is continuity present?

--

Go to Step 14

Go to Step 13

13

Locate and repair an open in CKT 1050 (BLK).

Is the repair complete?

--

Go to Liftgate Window Release System Check

--

14

Locate and repair an open in CKT 1576 (BLK).

Is the repair complete?

--

Go to Liftgate Window Release System Check

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