GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the Wiper/Washer operation and perform the necessary inspections?

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Go to Step 2

Go to Diagnostic Starting Point

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn the rear window wiper/washer switch to the DELAY position.
  3. Using a test lamp backprobe from the rear window wiper/washer module connector CKT 97 (LT BLU) cavity D to ground.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 4

3

Connect a test lamp between the rear window wiper/washer module connector CKT 391 (GRY) cavity B to ground.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 5

4

Using a test lamp backprobe from the rear window wiper/washer switch CKT 97 (LT BLU) cavity F to ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 8

5

Using a test lamp backprobe from the rear window wiper/washer switch CKT 391 (GRY) cavity D to ground.

Does the test lamp illuminate?

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Go to Step 9

Go to Step 8

6

Replace the window wiper/washer module.

Refer to Liftgate Wiper Motor Replacement .

Did you complete the replacement?

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Go to Step 10

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7

Repair the open in CKT 97 (LT BLU).

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 10

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8

Replace the rear window wiper/washer switch.

Refer to Accessory Switch Replacement in Instrument Panel, Gauges, and Console.

Did you complete the replacement?

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Go to Step 10

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9

Repair the open in CKT 391 (GRY).

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2