GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Wiper/Washer Diagnostic System Check performed?

--

Go to Step 2

Go to Wiper/Washer System Check

2

  1. Turn the ignition switch to RUN.
  2. Set the washer switch to ON.

Do the washers operate?

--

Go to Step 3

Go to Step 4

3

Replace the wiper motor. Refer to Windshield Wiper Motor Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

4

  1. Disconnect the wiper harness connector from the wiper motor.
  2. Connect a test light between wiper motor connector (harness side) terminals B and C.

Is the test light on?

--

Go to Step 10

Go to Step 5

5

Connect a test light between the wiper motor connector (harness side), terminal B, and ground.

Is the test light on?

--

Go to Step 9

Go to Step 6

6

Check for an open (blown) WSW fuse in the Underhood Junction Block.

Is the fuse open (blown)?

--

Go to Step 7

Go to Step 8

7

  1. Disconnect Underhood Junction Block connector C2.
  2. Measure the resistance from Underhood Junction Block connector C2, terminal F3, to ground with a J 39200 DMM.

Is the measurement less than the specified value?

0.5 ohms

Go to Step 17

Go to Step 18

8

Repair the open circuit condition in CKT 143.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

9

Repair the open circuit in CKT 150.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

10

  1. Set the wiper switch to HI.
  2. Connect a test light between wiper motor connector (harness side), terminal H, and ground.

Is the test light on?

--

Go to Step 16

Go to Step 11

11

Check for an open (blown) ACC fuse in the Underhood Junction Block.

Is the fuse open (blown)?

--

Go to Step 12

Go to Step 13

12

Replace the ACC fuse.

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

13

Check for an open circuit condition in CKT 43.

Is an open circuit condition present?

--

Go to Step 14

Go to Step 15

14

Repair the open circuit condition in CKT 43.

Is the repair complete?

--

Go to Wiper/Washer System Check

--

15

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

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

16

Replace the wiper motor cover. Refer to Wiper Motor Cover Replacement .

Is the replacement complete?

--

Go to Wiper/Washer System Check

--

17

Repair the short circuit to ground condition in CKT 143.

Is the repair complete?

--

Go to Step 18

--

18

Replace the WSW fuse.

Is the replacement complete?

--

Go to Wiper/Washer System Check

--