For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
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

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the windshield washer pump control circuit harness connector at the windshield washer pump.
3. Turn the ignition ON, with the engine OFF.
4. Connect a test lamp from the control circuit to the ground circuit of the windshield washer pump.
5. Press the windshield washer switch.

Does the test lamp illuminate?

Go to Step 10

Go to Step 4

4 |

1. Connect a test lamp from the control circuit of the windshield washer pump to a good ground.
2. Press the windshield washer switch.

Does the test lamp illuminate?

Go to Step 15

Go to Step 5

5 |

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

6 |

1. Turn OFF the ignition.
2. Reconnect the windshield wiper/washer switch.
3. Turn the ignition ON, with the engine OFF.
4. Connect a test lamp from the windshield wiper/washer switch signal circuit of the body control module (BCM) to a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 7

7 |

1. Turn OFF the ignition.
2. Disconnect the harness connector C4 of the BCM.
3. Turn the ignition ON, with the engine OFF.
4. Connect a test lamp from the control circuit of the windshield washer pump to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 14

8 |

1. Turn OFF the ignition.
2. Reconnect the harness connector C4 of the BCM.
3. Disconnect the harness connector C3 of the BCM.
4. Turn the ignition ON, with the engine OFF.
5. Connect a test lamp from the control circuit of the windshield washer pump in harness connector C3 of the BCM to a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 14

9 | Test the accessory voltage circuit of the windshield wiper/washer switch for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 13
10 | Inspect for poor connections at the windshield washer pump. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 16
11 | Inspect for poor connections at 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 19 | Go to Step 17
12 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 19 | Go to Step 18
13 | Repair a short to ground on the control circuit of the windshield washer pump. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 19 | --
14 | Repair an open or high resistance on the control circuit of the windshield washer pump. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 19 | --
15 | Repair an open or high resistance on the ground circuit of the windshield washer pump. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 19 | --
16 | Replace the windshield washer pump. Refer to Washer Pump Replacement . Did you complete the replacement? | Go to Step 19 | --
17 | Replace the windshield wiper/washer switch. Refer to Windshield Wiper and Washer Switch Replacement . Did you complete the replacement? | Go to Step 19 | --
18 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 19 | --
19 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3