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

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 4

3

Disconnect the rear window wiper/washer switch.

Does the rear wiper continue to operate?

--

Go to Step 5

Go to Step 6

4

Replace the rear window wiper/washer module.

Refer to Liftgate Wiper Motor Replacement .

Did you complete the replacement?

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Go to Step 7

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5

Repair the short to voltage in CKT 391 (GRY).

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 7

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6

Replace the rear window wiper/washer switch.

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

Did you complete the replacement?

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Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2