GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

Important: The wiper relay is located behind the instrument panel, below the cluster dimmer switch. Remove the cluster dimmer switch and the instrument panel side cover to access the wiper relay.

1

  1. Turn the ignition ON.
  2. Use a voltmeter to test for battery voltage at the wiper relay connector terminal 6.

Is battery voltage available at connector terminal 6?

11-14 V

Go to Step 3

Go to Step 2

2

Repair the open circuit between the wiper relay connector terminal 6 and fuse F17.

Is the repair complete?

--

System OK

--

3

  1. Turn the ignition ON.
  2. Turn the wiper switch to INT.

Using a voltmeter, is battery voltage available at the wiper relay connector terminal 7?

11-14 V

Go to Step 7

Go to Step 4

4

  1. Turn the ignition ON.
  2. Turn the wiper switch to INT.

Using a voltmeter, is battery voltage available at wiper switch connector terminal 7?

11-14 V

Go to Step 6

Go to Step 5

5

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

Is the repair complete?

--

System OK

--

6

Repair the open circuit between the wiper switch connector terminal 7 and the wiper relay connector terminal 7.

Is the repair complete?

--

System OK

--

7

  1. Turn the ignition ON.
  2. Turn the wiper switch to INT.

Using a voltmeter, is battery voltage pulsing at wiper relay connector terminal 5?

11-14 V

Go to Step 11

Go to Step 8

8

Using an ohmmeter, check the wiper relay ground circuit, connector terminal 6.

Is the ground circuit OK?

0 ohms

Go to Step 10

Go to Step 9

9

Repair the open ground circuit.

Is the repair complete?

--

System OK

--

10

Replace the wiper relay.

Is the repair complete?

--

System OK

--

11

  1. Disconnect the wiper switch connector.
  2. Turn the wiper switch to INT.
  3. Using an ohmmeter, check the wiper switch.

Is there continuity between terminals 5 and 6?

0 ohms

Go to Step 13

Go to Step 12

12

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

Is the repair complete?

--

System OK

--

13

Repair the open circuit between the wiper switch and the wiper relay.

Is the repair complete?

--

System OK

--