GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Wiper/Washer Schematics

Connector End View Reference: Wiper/Washer Connector End Views

DEFINITION: The headlamp washers are inoperative. The windshield washers and headlamps operate normally. The CHECK WASHER FLUID LEVEL message isn't displayed.

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, with the engine OFF.
  2. Turn the headlamps ON.
  3. Press the windshield washer switch.

Do the headlamp washers operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Turn the headlamps OFF.
  3. Disconnect the headlamp washer relay.
  4. Turn the ignition ON, with the engine OFF.
  5. Connect a test lamp from the windshield washer pump control circuit to a good ground.
  6. Press the windshield washer switch.

Does the test lamp illuminate?

Go to Step 4

Go to Step 14

4

Connect a test lamp from the battery voltage circuit of the headlamp washer relay switched input to a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 9

5

  1. Connect a test lamp from the battery voltage circuit of the headlamp washer relay switched input to the ground circuit of the headlamp washer relay.
  2. Turn the headlamps ON.

Does the test lamp illuminate?

Go to Step 6

Go to Step 10

6

Connect a 30 ampere fused jumper wire from battery voltage to the headlamp washer relay switched input to relay switched output to the supply voltage circuit of the headlamp washer pump

Does the headlamp washer pump operate?

Go to Step 11

Go to Step 7

7

  1. Disconnect the harness connector of the headlamp washer pump.
  2. Connect a test lamp from the supply voltage circuit to the ground circuit of headlamp washer pump.

Does the test lamp illuminate?

Go to Step 12

Go to Step 8

8

Connect a test lamp from the supply voltage circuit of headlamp washer pump to a good ground.

Does the test lamp illuminate?

Go to Step 17

Go to Step 16

9

Test the battery voltage circuit of the headlamp washer relay switched input for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 15

10

Test the ground circuit of the headlamp washer relay for an open or short to voltage. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 13

11

Inspect for poor connections at the headlamp washer relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 18

12

Inspect for poor connections at the headlamp washer pump. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 19

13

Inspect for poor connections at the dash integration module (DIM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 20

14

Repair the windshield washer pump control circuit for an open or short to ground. Refer to Wiring Repairs and to Connector Repairs .

Is the repair complete?

Go to Step 21

--

15

Repair a short to ground on the windshield washer pump supply voltage circuit. Refer to Wiring Repairs and to Connector Repairs .

Is the repair complete?

Go to Step 21

--

16

Repair an open or high resistance on the windshield washer pump supply voltage circuit. Refer to Wiring Repairs and to Connector Repairs .

Is the repair complete?

Go to Step 21

--

17

Repair an open or high resistance on the windshield washer pump ground circuit. Refer to Wiring Repairs and to Connector Repairs .

Is the repair complete?

Go to Step 21

--

18

Replace the headlamp washer relay.

Is the repair complete?

Go to Step 21

--

19

Replace the headlamp washer pump. Refer to Headlamp Washer Pump Replacement .

Is the repair complete?

Go to Step 21

--

20

Replace the DIM. Refer to Control Module References for replacement, setup and programming.

Is the repair complete?

Go to Step 21

--

21

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3