GM Service Manual Online
For 1990-2009 cars only

Wiper/Washer Diagnostic System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ON position.
  2. Leave the Wiper Switch in the OFF position.
  3. Depress the washer switch for 2 to 4 seconds and release.
  1. Wipers operate at low speed.
  2. Washer sprays windshield as long as washer switch is held in the ON position.
  3. After releasing switch, washer stops and wipers return to park position after 2 to 4 sweeps.

Washer Pump Inoperative.

2

  1. Move the wiper switch to the INT position.
  2. Rotate the INT ADJ switch from the high to low delay position.
  1. Wipers make one complete sweep, then pause before making next sweep.
  2. The pause time is adjusted by turning the INT ADJ switch through the delay range.

Wiper Intermittent Mode Inoperative.

3

  1. Leave the wiper switch in the INT position.
  2. Depress the washer switch for 2 to 4 seconds and release.
  1. Washer sprays windshield as long as washer switch is held in the ON position.
  2. Wipers run at low speed while spraying and continue for 2 to 4 sweeps after washer switch is released.
  3. Wipers then return to pulse operation.
    • Washer Pump Inoperative.
    • Wiper Intermittent Mode Inoperative.

4

Move the wiper switch to the LO position.

Wipers run continuously at low speed.

    • Wiper Operates Only In High Speed.
    • Wiper Motor Inoperative (All Modes).

5

Move the wiper switch to the HI position.

Wipers run continuously at high speed.

Wiper Motor Inoperative (All Modes).

6

Move the wiper switch to the OFF position.

Wipers return to the park position at low speed.

    • Wiper Does Not Shut Off.
    • Wiper Shuts Off but Blades Do Not Park.

7

Move the wiper switch to the MIST position and then release.

Wipers make one complete sweep, then return to the park position.

    • Wiper Does Not Shut Off.
    • Wiper Shuts Off but Blades Do Not Park.
    • Wiper Motor Inoperative (All Modes).

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.