GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics in Wipers/Washer Systems.

Connector End View Reference: Component Connector End Views .

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Ignition ON.
  2. Turn the Wiper/Washer switch OFF.

Do the windshield wipers remain in the Park position?

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

Go to Step 3

3

Disconnect the harness connector of the Wiper/Washer switch.

Do the windshield wipers stop?

Go to Step 11

Go to Step 4

4

Connect a test lamp from the signal circuit of the Wiper/Washer switch at the body control module (BCM) to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 5

5

Connect a test lamp from the supply voltage circuit of the wiper Hi relay coil to a good ground.

Does the test lamp illuminate?

Repair a short to voltage on supply voltage circuit of the wiper  relay coil. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Go to Step 6

6

Connect a test lamp from the control circuit of the washer pump to a good ground.

Does the test lamp illuminate?

Repair a short to voltage on control circuit of the washer pump. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Go to Step 7

7

Disconnect the wiper  relay.

Do the windshield wipers stop?

Go to Step 8

Repair a short to voltage on high speed circuit of the windshield wiper motor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

8

Connect a test lamp from the supply voltage circuit of the wiper  relay coil from the BCM to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 12

9

Test the signal circuit of the Wiper/Washer switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 13

10

Test the supply voltage circuit of the wiper  relay for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 13

11

Inspect for poor connections at the windshield 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?

System OK

Replace the Wiper/Washer switch. Refer to Windshield Wiper and Washer Switch Replacement .

12

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

Did you find and correct the condition?

System OK

Replace the wiper  relay.

13

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

Did you find and correct the condition?

System OK

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems, for replacement, setup, and programming.