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 review the Wiper/Washer System Description and Operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms - Wiper/Washer Systems

2

  1. Turn the ignition ON, with the engine OFF.
  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 washer wipers operate when the windshield washer switch is pressed?

--

Go to Step 6

Go to Step 4

4

  1. Turn the ignition OFF.
  2. Disconnect the windshield wiper motor connector.
  3. Turn the ignition ON, with the engine OFF.
  4. Test the resistance from the windshield wiper switch supply voltage circuit terminal to the windshield wiper switch signal circuit terminal in the windshield wiper motor harness connector.
  5. Press the windshield washer switch.

Is the resistance near the specified value?

0.5 ohms

Go to Step 15

Go to Step 5

5

Test the following circuits for open or high resistance.

    • Windshield wiper switch supply voltage circuit
    • Windshield wiper switch signal circuit

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 13

6

  1. Turn the ignition OFF.
  2. Disconnect the windshield washer relay.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp test from each of the windshield washer relay battery positive voltage supply circuit terminals in the underhood fuse block to ground.

Does the test lamp illuminate on both terminals?

--

Go to Step 7

Go to Step 9

7

  1. Connect a test lamp from battery positive voltage to the windshield washer relay control circuit terminal in the underhood fuse block.
  2. Press the windshield washer switch.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 10

8

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

Does the test lamp illuminate?

--

Go to Step 18

Go to Step 11

9

Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the replacement?

--

Go to Step 20

--

10

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 15

11

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 12

12

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 17

13

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 14

14

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

Did you complete the replacement?

--

Go to Step 20

--

15

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 16

16

Replace the windshield wiper motor module.

Did you complete the replacement?

--

Go to Step 20

--

17

Replace the windshield washer relay.

Did you complete the replacement?

--

Go to Step 20

--

18

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 19

19

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

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