GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

DEFINITION: The rear wiper motor is inoperative in all modes, the rear washer pump may or may not operate.

1

Did you review the Rear Wiper/Washer System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Wiper/Washer Systems

2

  1. Turn the ignition ON.
  2. Operate the rear wiper/washer system in all the switch positions.

Does the rear wiper/washer system operate normally?

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

Go to Step 3

3

Does the rear washer pump operate when the rear washer switch is pressed?

Go to Step 4

Go to Step 6

4

Test the rear wiper motor module ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 5

5

  1. Using a test lamp backprobe across the rear wiper motor control and ground circuit terminals in the rear wiper motor connector at the wiper motor module.
  2. Turn the ignition ON.
  3. Turn the rear wiper/washer switch to the ON position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 7

6

Test the rear wiper/washer switch accessory voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

7

Inspect for poor connections at the rear wiper motor module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

Replace the rear wiper motor module.

Is the repair complete?

Go to Step 12

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9

Replace the rear wiper motor. Refer to Liftgate Wiper Motor Replacement .

Is the repair complete?

Go to Step 12

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10

Inspect for poor connections at the rear wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

11

Replace the rear wiper/washer switch. Refer to Accessory Switch Replacement in Instrument Panel, Gages, and Console.

Is the repair complete?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3