GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Corvette 🢒 Body Systems 🢒 Wipers and Washers 🢒 Wipers Inoperative - All Modes

Diagnostic Aids

If the 30 A WIPER fuse located in the underhood fuse block is open, a short to ground in any one of the following circuits may be the cause:

    • Windshield wiper motor high speed circuit
    • Windshield wiper motor low speed circuit
    • Windshield wiper motor park switch voltage supply circuit
    • Windshield wiper motor park switch signal circuit
    • Accessory voltage -- WIPER RUN/ACC relay switched voltage circuit

If the 10 A WPR/WASHER fuse located in the instrument panel (I/P) fuse block is open , a short to ground in any one of the following circuits may be the cause:

    • Accessory voltage circuit to the wiper switch
    • Windshield washer switch signal circuit
    • Windshield wiper switch low signal circuit
    • Windshield wiper switch high signal circuit
    • Windshield washer relay control circuit
    • Headlamp washer relay control circuit

Test Description

  1. This step verifies that voltage is present from the ON/OFF relay with the wiper switch in the On position.

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

DEFINITION: Windshield wipers are inoperative in all modes.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn ON the ignition.
  2. Attempt to operate the windshield wipers in all modes.

Are the windshield wipers inoperative in all modes?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Windshield Wiper Switch parameter in the Body Control Module data list.
  4. Place the wiper switch in the LOW speed position.

Does the Windshield Wiper Switch parameter display Low?

Go to Step 6

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Remove the wiper RUN/ACC relay. Refer to Relay Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage circuit of the wiper RUN/ACC relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 14

5
  1. Turn OFF the ignition.
  2. Disconnect the windshield wiper/washer switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp from the battery positive voltage circuit of the wiper switch connector to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 16

6

  1. Turn the ignition OFF.
  2. Remove the wiper HI/LO relay. Refer to Relay Replacement .
  3. Turn the ignition ON, with the engine OFF.
  4. Place the windshield wiper/washer switch in the LOW position.
  5. Probe the voltage supply circuit of the HI/LO relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

7
  1. Turn OFF the ignition.
  2. Remove the wiper ON/OFF relay. Refer to Relay Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage circuit of the wiper ON/OFF relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 15

8
  1. Turn OFF the ignition.
  2. Install the wiper HI/LO and ON/OFF relays.
  3. Disconnect the windshield wiper motor.
  4. Turn ON the ignition, with the engine OFF
  5. Connect a test lamp from the wiper motor low speed circuit of the wiper motor connector to a good ground.
  6. Place the wiper switch in the LOW speed position.

Does the test lamp illuminate?

Go to Step 9

Go to Step 13

9
  1. Connect the test lamp between the low speed circuit of the wiper motor connector and the ground circuit of the wiper motor connector.
  2. Place the wiper switch in the LOW speed position.

Does the test lamp illuminate?

Go to Step 11

Go to Step 17

10

Inspect for poor connections at the harness connector of 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 22

Go to Step 18

11

Inspect for poor connections at the harness connector of the wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 19

12

Inspect for poor connections at the ON/OFF relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 20

13

Inspect for poor connections at the HI/LO relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 21

14

Repair the short to ground or open in the battery positive voltage circuit of the wiper RUN/ACC relay. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 22

--

15

Repair the short to ground or open in the battery positive voltage circuit of the wiper On/Off relay. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 22

--

16

Repair the short to ground or open in the battery positive voltage circuit of the windshield wiper/washer switch. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 22

--

17

Repair the open in the ground circuit of the windshield wiper motor. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 22

 

18

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

Did you complete the replacement?

Go to Step 22

--

19

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

Did you complete the replacement?

Go to Step 22

--

20

Replace the wiper ON/OFF relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 22

--

21

Replace the wiper HI/LO relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 22

--

22
  1. Reconnect all previous disconnected components.
  2. Clear all DTCs with a scan tool.
  3. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2