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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn the ignition ON.
  2. Turn the windshield wiper/washer switch OFF.

Do the windshield wipers remain in the PARK position?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the harness connector of the windshield 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 windshield 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 2 relay coil to a good ground.

Does the test lamp illuminate?

Go to Step 14

Go to Step 6

6

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

Does the test lamp illuminate?

Go to Step 15

Go to Step 7

7

Disconnect the wiper 1 relay.

Do the windshield wipers stop?

Go to Step 8

Go to Step 16

8

Connect a test lamp from the supply voltage circuit of the wiper 1 relay coil to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 12

9

Test the signal circuit of the windshield wiper switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 13

10

Test the supply voltage circuit of the wiper 1 relay for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 20

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 .

Did you find and correct the condition?

Go to Step 20

Go to Step 17

12

Inspect for poor connections at the wiper 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 20

Go to Step 18

13

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

Did you find and correct the condition?

Go to Step 20

Go to Step 19

14

Repair a short to voltage on supply voltage circuit of the wiper 2 relay coil. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 20

--

15

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

Did you complete the repair?

Go to Step 20

--

16

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

Did you complete the repair?

Go to Step 20

--

17

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

Did you complete the replacement?

Go to Step 20

--

18

Replace the wiper 1 relay.

Did you complete the replacement?

Go to Step 20

--

19

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 20

--

20

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3