GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

DEFINITION: The windshield washer pump is inoperative.

1

Did you perform the Diagnostic System Check - Wiper/Washer?

--

Go to Step 2

Go to Diagnostic System Check - Wiper/Washer

2

  1. Turn the ignition ON.
  2. Press the windshield washer switch.

Do the windshield washers operate normally?

--

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

Go to Step 3

3

Do the windshield wipers operate when the windshield washer switch is pressed?

--

Go to Step 4

Go to Step 7

4

  1. Disconnect the windshield washer relay. Refer to Relay Replacement in Wiring Systems.
  2. Probe each of the windshield washer relay battery positive voltage supply circuit terminals in the underhood fuse block with a test lamp connected to a good ground.

Does the test lamp illuminate on both terminals?

--

Go to Step 5

Go to Step 19

5

  1. Connect a test lamp between the battery positive voltage terminal and the windshield washer relay control circuit terminal in the underhood fuse block.
  2. Turn the ignition ON.
  3. Press the windshield washer switch.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 9

6

  1. Connect the windshield washer relay.
  2. Disconnect the windshield washer pump connector.
  3. Connect a test lamp across the windshield washer pump harness connector terminals.
  4. Turn the ignition ON.
  5. Press the windshield washer switch.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 10

7

  1. Disconnect the windshield wiper motor connector.
  2. Test the resistance from the windshield wiper switch supply voltage circuit terminal to the windshield wiper switch signal 1 circuit terminal in the windshield wiper motor harness connector. Refer to Circuit Testing .
  3. Press the windshield washer switch.

Is the resistance near the specified value?

0.5 ohms

Go to Step 14

Go to Step 8

8

Test the following circuits for high resistance:

    • Windshield wiper switch supply voltage circuit
    • Windshield wiper switch signal 1 circuit
         Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 13

9

Test the windshield washer relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 14

10

Test the windshield washer pump control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 11

11

Test the windshield washer pump ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 15

12

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 16

13

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?

--

Go to Step 20

Go to Step 17

14

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 18

15

Replace the windshield washer relay. Refer to Relay Replacement in Wiring Systems.

Is the repair complete?

--

Go to Step 20

--

16

Replace the windshield washer pump. Refer to Washer Pump Replacement .

Is the repair complete?

--

Go to Step 20

--

17

Replace the windshield wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Is the repair complete?

--

Go to Step 20

--

18

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

Is the repair complete?

--

Go to Step 20

--

19

Replace the underhood fuse block.

Is the repair complete?

--

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