GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD 🢒 Body and Accessories 🢒 Body Rear End 🢒 Liftgate Window Release Switch Inoperative

Step

Action

Value(s)

Yes

No

DEFINITION: The liftgate/endgate window release switch will not activate the liftgate/endgate window release actuator. The lock cylinder switch operates properly.

1

Did you review the release system operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

2

Verify that the liftgate/endgate window release switch is inoperative.

Does the liftgate/endgate window release switch operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  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?

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Go to Step 7

Go to Step 4

4
  1. Disconnect the liftglass relay.
  2. Use a 3A 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 9

5

Using a DMM test for continuity between liftglass relay terminal 1 and terminal 2. Refer to Circuit Testing in wiring systems.

Is continuity present?

--

Go to Step 6

Go to Step 13

6
  1. Install the liftglass relay in the underhood fuse block.
  2. Disconnect the body control module (BCM) connector C2. Connect a 3A fused jumper wire between cavity A6 of connector C2 and ground.

Did the liftglass release operate?

--

Go to Step 15

Go to Step 10

7

Connect a 3A fused jumper wire between terminal D and terminal E of the endgate/liftgate window release switch.

Did the liftglass release operate?

--

Go to Step 14

Go to Step 8

8

Connect a DMM between ground and terminal E of the window release switch. Refer to Circuit Testing in wiring systems.

Is continuity present?

--

Go to Step 12

Go to Step 11

9

Locate and repair an open in CKT 56 (BLK/WHT). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

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Go to Step 16

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10

Locate and repair an open in CKT 1344 (LT BLU). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

--

11

Locate and repair an open in CKT 1050 (BLK). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

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12

Locate and repair an open in CKT 1576 (BLK). Refer to Wiring Repairs in wiring systems.

Is the repair complete?

--

Go to Step 16

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13

Replace the liftglass relay.

Is the repair complete?

--

Go to Step 16

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14

Replace the endgate/liftgate window release switch.

Is the repair complete?

--

Go to Step 16

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15

Replace the BCM. Refer to Body Control Module Replacement in body control systems.

Is the repair complete?

--

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3