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Windshield Wiper Washer System Malfunction



WINDSHIELD WIPER WASHER SYSTEM MALFUNCTION




DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
Wash, Mist, Delay 1-4, Low, and Park are all low speed wiper motor functions controlled by the body control module (BCM). The BCM energizes the WIPER ON/OFF relay in order to operate the wiper motor at low speed. When energized, the output of the ON/OFF relay applies battery voltage through the wiper HI/LO relay to the wiper motor. The high speed wiper function operates independent of the wiper switch signal 1 circuit and any BCM output. During high speed wiper operation the windshield wiper switch high signal circuit directly energizes the WIPER HI/LO relay and energizes the WIPER ON/OFF relay through the WIPER diode.

DIAGNOSTIC AIDS
- If the wiper motor runs at high speed during the low speed modes replace the WIPER diode.
- A short to ground in the following circuits will open the wiper fuse:
- Ignition 1 voltage
- Windshield wiper motor relay coil supply voltage
- Windshield wiper switch high signal
- Windshield washer pump control
- Windshield wiper motor low speed control
- Windshield wiper motor high speed control

CIRCUIT TESTING

Wipers Inoperative All Modes
1. Ignition ON, use a scan tool to observe the Windshield Wiper Switch parameter in the Body Control Module data list. Place the wiper switch in the LOW speed mode. The Windshield Wiper Switch parameter should display Low.
- If the scan tool does not display Low, test for a short to ground or an open/high resistance on the ignition 1 voltage circuit to the windshield wiper/washer switch. If the circuit/connections tests normal, replace the windshield wiper/washer switch.
2. Remove the wiper ON/OFF relay.
3. Ignition ON with the wiper switch in the low speed position, verify that a test lamp illuminates between the supply voltage circuit of the ON/OFF relay and the negative terminal of the battery.
- If the test lamp does not illuminate, test for an open/high resistance on the supply voltage terminal of the relay connector. If the circuit/connections test normal, replace the fuse block.
4. Install the wiper ON/OFF relay.
5. Remove the wiper HI/LO relay.
6. Ignition ON with the wiper switch in the low speed position, verify that a test lamp illuminates between the voltage supply circuit, to the switch side of the HI/LO relay and the negative terminal of the battery.
- If the test lamp does not illuminate, test for an open/high resistance on the voltage supply circuit. If the circuit/connections test normal, replace the wiper HI/LO relay.
7. Verify that a test lamp illuminates between the ground circuit of the HI/LO relay and the positive terminal of the battery.
- If the test lamp does not illuminate, repair the ground circuit for an open/high resistance.
8. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
9. Install the wiper HI/LO relay.
10. Ignition ON with the wiper switch in the low speed position, verify that a test lamp illuminates between the windshield wiper motor low speed control circuit and the negative terminal of the battery.
- If the test lamp does not illuminate, replace the wiper HI/LO relay.
11. Verify that a test lamp illuminates between the ground circuit of the wiper motor and the positive terminal of the battery.
- If the test does not illuminate, repair the ground circuit for an open/high resistance.
12. If all circuits/connections test normal, replace the windshield wiper motor.

Delay or Low Speed Wipers Inoperative
1. Ignition ON, use a scan tool to observe the Windshield Wiper Switch parameter in the Body Control Module data list. Turn the wiper switch through each DELAY and LOW position. The parameter should display Delay 1-4 for each delay position and Low for the low speed position.
- If the Windshield Wiper Switch parameter does not display each wiper switch position, test the following:
- Perform the windshield wiper/washer switch low speed component test.
- Test for a short to ground or an open/high resistance on the windshield wiper switch low/pulse signal circuit.
- If the wiper switch and circuits/connections test normal, replace the body control module.
2. Remove the wiper ON/OFF relay.
3. Ignition ON with the wiper switch in the LOW speed position, verify that a test lamp illuminates between the windshield wiper motor relay coil supply voltage circuit of the ON/OFF relay and the negative terminal of the battery.
- If the test lamp does not illuminate, replace the BCM.
4. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
5. Install the wiper ON/OFF relay.
6. Ignition ON with the wiper switch in the LOW speed position, verify that a test lamp illuminates between the wiper motor low speed control circuit of the wiper motor connector and the negative terminal of the battery.
- If the test does not illuminate, test the wiper motor low speed control circuit for an open/high resistance. If the circuit tests normal replace the wiper HI/LO relay.
7. If all the circuits/connections test normal, replace the windshield wiper motor.

High Speed Wipers Inoperative
1. Ignition OFF, remove the wiper HI/LO relay.
2. Ignition ON with the wiper switch in the HIGH speed position and verify that a test lamp illuminates between the windshield wiper switch high speed signal circuit, to the coil side of the HI/LO relay and the negative terminal of the battery.
- If the test lamp does not illuminate, test the windshield wiper switch high signal circuit for an open/high resistance. If the circuit tests normal, replace the windshield wiper switch.
3. With the wiper switch in the HIGH speed position, verify the a test lamp illuminates between the ground circuit of the wiper HI/LO relay and the positive terminal of the battery.
- If the test lamp does not illuminate, repair the ground circuit of the HI/LO relay for an open/high resistance.
4. Remove the wiper ON/OFF relay.
5. Ignition ON with the wiper switch in the HIGH speed position, verify that a test lamp illuminates between the windshield wiper motor relay coil supply voltage circuit of the ON/OFF relay and the negative terminal of the battery.
- If the test lamp does not illuminate, test the wiper high speed signal circuit and the connector terminals of the wiper diode in the underhood fuse block for an open/high resistance. If the circuit/connections test normal, replace the wiper diode.
6. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
7. Install the wiper ON/OFF relay.
8. Ignition ON with the wiper switch in the HIGH speed position, verify that a test lamp illuminates between the wiper motor high speed control circuit of the wiper motor connector and the negative terminal of the battery.
- If the test lamp does not illuminate, test the wiper motor high speed control circuit for an open/high resistance. If the circuit/connections tests normal replace the wiper HI/LO relay.
9. If all the circuits test normal replace the windshield wiper motor.

Wiper Operate at High Speed in the Low Speed Mode
1. Ignition OFF, remove the wiper diode.
2. Ignition ON, place the wiper switch in the LOW speed position. The wipers should operate in the low speed mode.
- If the wipers operate in the low speed mode, replace the wiper diode.
- If the wipers operate in the high speed mode, replace the wiper HI/LO relay.

Wipers Do Not Park or are Erratic in the Delay Modes
1. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
2. Install a 3-amp fused jumper wire between the windshield wiper motor park switch signal circuit of the wiper motor connector and the negative terminal of the battery.
3. Ignition ON, use a scan tool to observe the Wiper Park Switch parameter in the Body Control Module data list and verify the parameter displays On.
- If the Wiper Park Switch parameter displays Off, test the signal circuit of the windshield wiper motor park switch for an open/high resistance. If the circuit/connections tests normal, replace the BCM.
4. If all circuits/connections test normal, replace the windshield wiper motor.

Wipers Always On
1. Ignition ON, with a scan tool observe the Windshield Wiper Switch parameter in the Body Control Module data list and verify that the scan tool displays Off.
- If the scan tool displays Delay, Mist, or Low, test the windshield wiper switch low/pulse signal circuit of the windshield wiper switch for a short to voltage. If the circuit/connections test normal, replace the wiper switch.
2. Ignition OFF, remove the wiper HI/LO relay.
3. Ignition ON with the wiper switch in the OFF position, verify that a test lamp does not illuminate between the windshield wiper switch high signal circuit of the HI/LO relay and the negative terminal of the battery.
- If the test lamp illuminates, test the windshield wiper switch high signal circuit of the windshield wiper switch for a short to voltage. If the circuit/connections test normal, replace the wiper switch.
4. If all the circuits test normal replace the wiper HI/LO relay.

Washers Inoperative
1. Ignition ON, use a scan tool to observe the Windshield Washer Switch parameter in the Body Control Module data list while pressing the windshield washer switch. The reading should change from Off to On.
- If the scan tool displays Off, test the windshield washer switch signal circuit and the wiper switch for an open/high resistance. If the circuit/connections and wiper switch test normal, replace the BCM.
2. Ignition OFF, disconnect the harness connector at the windshield washer fluid pump.
3. Connect a test lamp between the control circuit of the windshield washer pump and the negative terminal of the battery.
4. Ignition ON, press windshield washer switch. The test should illuminate when the switch is pressed.
- If the test lamp does not illuminate, test for an open/high resistance on the windshield washer pump control circuit from the BCM. If the circuit/connections test normal, replace the BCM.
5. Connect the test lamp between the control circuit and the ground circuit of the windshield washer fluid pump.
6. Ignition ON, press the windshield washer switch. The test lamp should illuminate when the switch is pressed.
- If the test lamp does not illuminate, repair the ground circuit for an open/high resistance.
7. If all the circuits/connections test normal, replace the windshield washer pump.

Washers Always On
1. Ignition ON, use a scan tool to observe the Washer Switch parameter in the Body Control Module data list. The parameter should display Off.
- If the parameter displays On, test for a short to voltage on the windshield washer switch signal circuit. If the circuit/connections test normal, replace the windshield wiper switch.
2. Test for a short to voltage on the windshield washer pump control circuit between the BCM and the windshield washer fluid pump. If all circuits/connections test normal, replace the BCM.

COMPONENT TESTING

Windshield Wiper Washer Switch High and Wash Circuits
1. Disconnect the steering column harness to I/P harness inline connector C204.
2. Measure the resistance between the ignition 1 voltage circuit and the windshield wiper switch high signal circuit from the wiper switch side of the inline connector.
3. The resistance should indicate continuity while the wiper switch is in the High speed position.
- If the measured resistance is not less than 2 ohms, replace the windshield wiper washer switch.
4. The DMM should indicate no continuity while the wiper switch is in any position other than High.
- If the DMM does not display infinite resistance replace the windshield wiper washer switch.
5. Measure the resistance between the ignition 1 voltage circuit and the windshield washer pump control circuit from the wiper switch side of the inline connector.
6. The resistance should indicate continuity while the windshield washer switch is pressed.
- If the measured resistance is not less than 2 ohms, replace the windshield wiper washer switch.
7. The DMM should indicate no continuity when the windshield washer switch is released.
- If resistance is displayed, replace the windshield wiper washer switch.

Windshield Wiper Washer Switch Low Speed Circuit

1. Disconnect the Steering Column harness to I/P harness inline connector C204.

IMPORTANT: If the switch tests open in any switch position other than Off, test wiper switch low/pulse signal circuit for a short to ground before replacing the switch.

2. Measure the resistance between the ignition 1 voltage circuit of the wiper switch and the windshield wiper switch low/pulse signal circuit of the wiper switch.
3. Operate the windshield wiper switch from Off to Mist, Delay 1 through 4, Low, and High.




Disconnect the Steering Column harness to I/P harness inline connector C204. If the measured resistance does not display at or near the resistance values provided replace the windshield wiper/washer switch.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

- Wiper Motor Replacement
- Washer Pump Replacement
- Control Module References for BCM replacement, setup, and programming.
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