For 1990-2009 cars

### Diagnostic Aids

If the wiper module 30A fuse is open, a short to ground in either one of the following circuits may be the cause:

• | Accessory voltage circuit to the wiper module

• | Windshield washer pump control circuit

If the wiper module 7.5A fuse is open, a short to ground in any one of the following circuits may be the cause:

• | Accessory voltage circuit to the switch

• | Windshield washer pump control circuit

• | Windshield wiper motor high speed circuit

• | Windshield wiper switch signal 1 circuit

• | Windshield wiper switch signal 2 circuit

• | Windshield wiper switch ON signal circuit

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views
1 | Have you conducted 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. Operate the windshield wiper/washer switch through all the switch positions.

Does the windshield wiper/washer system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 |

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

Does the test light illuminate?

Go to Step 4

Go to Step 9

4 | Connect a test lamp between the accessory voltage circuit of the wiper/washer module connector and the good ground circuit of the wiper/washer module connector. Does the test light illuminate? | Go to Step 5 | Go to Step 10
5 |

1. Connect a test lamp from the windshield wiper switch signal 2 circuit of the windshield wiper/washer module connector to a good ground.
2. Press the windshield washer switch.

Does the test light illuminate?

Go to Step 7

Go to Step 6

6 |

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

Does the test light illuminate?

Go to Step 8

Go to Step 11

7 | Check for poor connections at the harness connector of the windshield wiper/washer module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Do you find and correct the condition? | Go to Step 14 | Go to Step 12
8 | Check for poor connections at the harness connector of the windshield wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Do you find and correct the condition? | Go to Step 14 | Go to Step 13
9 | Repair the short to ground or open in the accessory voltage circuit of the windshield wiper/washer module. Refer to Wiring Repairs or Connector Repairs . Is the trouble corrected? | Go to Step 14 | --
10 | Repair the high resistance or open in the ground circuit of the windshield wiper/washer module. Refer to Wiring Repairs or Connector Repairs . Is the trouble corrected? | Go to Step 14 | --
11 | Repair the short to ground or open in the battery positive voltage circuit of the windshield wiper/washer switch. Refer to Wiring Repairs or Connector Repairs . Is the trouble corrected? | Go to Step 14 | --
12 | Replace the windshield wiper/washer module. Refer to Windshield Wiper Motor Replacement . Have you finished the replacement? | Go to Step 14 | --
13 | Replace the windshield wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement . Have you finished the replacement? | Go to Step 14 | --
14 | Operate the system to verify the repair. Is the failure removed? | System OK | Go to Step 2