Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 5: This step tests for continuity through the 390 ohms resistor in the windshield wiper/washer switch.
- 6: This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from low to high as the delay speed is increased.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Wiper/Washer System Schematics Connector End View Reference: Wiper/Washer System Connector End Views DEFINITION: Windshield wipers are inoperative in one or more modes. | ||||
| 1 | Did you perform the Wiper/Washer System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Wiper/Washer Systems | |
| 2 | Turn the ignition ON, with the engine OFF. Attempt to operate the windshield wipers in all modes. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
| 3 | Do the windshield wipers operate in the high speed mode? | Go to Step 5 | Go to Step 4 | |
| 4 | Turn the ignition OFF. Disconnect the multifunction turn signal harness connector C3. Connect a fused jumper wire from the windshield wiper switch high signal circuit terminal in the body harness connector half to a good ground. Turn the ignition ON, with the engine OFF. Do the windshield wipers operate at high speed? | Go to Step 8 | Go to Step 7 | |
| 5 | Turn the ignition OFF. Disconnect the windshield wiper motor module connector. Test the resistance from the windshield wiper switch voltage supply circuit terminal to the windshield wiper switch signal circuit terminal in the windshield wiper motor harness connector. Operate the windshield wiper/washer switch in the following positions: MIST LO Is the resistance near the specified value in all of the listed switch positions? | 390 ohms | Go to Step 6 | Go to Step 9 |
| 6 | Test the resistance from the windshield wiper switch voltage supply circuit terminal to the windshield wiper switch signal circuit terminal in the windshield wiper motor harness connector. Operate the windshield wiper/washer switch in all of the delay positions. Does the resistance remain within the specified values from low to high as the delay speed is increased? | 1000 ohms-10K ohms | Go to Step 13 | Go to Step 11 |
| 7 | Test the windshield wiper switch high signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 13 | |
| 8 | Repair the wiper switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Is the repair complete? | Go to Step 15 | ||
| 9 | Test the windshield wiper switch voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 10 | |
| 10 | Test the windshield wiper switch signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11 | |
| 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 15 | Go to Step 12 | |
| 12 | Replace the windshield wiper/washer switch. Refer to Multifunction, Turn Signal Switch Replacement . Did you complete the replacement? | Go to Step 15 | ||
| 13 | Inspect for poor connections at the windshield wiper motor module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 14 | |
| 14 | Replace the windshield wiper motor module. Refer to Wiper Motor Replacement . Did you complete the replacement? | Go to Step 15 | ||
| 15 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | |
Wipers Inoperative - One or More Modes
Scheme 6
- Run the wiper arms to the mid-wipe position.
- Remove the wiper blades from the wiper arms. Refer to «Wiper Arm Blade Replacement»(ref-238213-S40864502902006072400000) .
- Attach a scale to the end of the wiper arm and measure the force required to lift the wiper arm perpendicular to the windshield to normal working height with the blade attached.
- Replace the wiper arm if the measurement is not within the specification. Refer to «Wiper Arm Replacement»(ref-238213-S37235956912006072400000) . Tip Pressure: Driver Side - 8.1-9.5 Newtons (29- 34 Ounces) Passenger Side - 5.8-7.0 Newtons (21- 25 Ounces)
Scheme 7
- Remove the wiper blades from the wiper arms. Refer to «Wiper Arm Blade Replacement»(ref-238213-S40864502902006072400000) .
- Look down the length of the blade element.
- Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade +/-15 degrees. Refer to «Wiper Blade Element Replacement»(ref-238213-S33654813792006072400000) .
- Install the wiper blades on the wiper arms. Refer to «Wiper Arm Blade Replacement»(ref-238213-S40864502902006072400000) .
Scheme 8
- Remove the washer solvent container. Refer to «Washer Pump/Reservoir Replacement»(ref-238213-S13753301822006072400000) .
- Using a small flat-bladed tool, remove the washer solvent container level sensor (1) and seal (2) from the container.
Wiper/Washer System Operation
The windshield wiper motor module controls the windshield wiper motor and washer pump operation. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The accessory voltage supply circuit to the windshield wiper motor provides the power for operating the wiper motor module. The windshield wiper switch supply voltage circuit is a 12-volt reference from the wiper motor module to the wiper/washer switch. The WASH, MIST, LOW, and DELAY modes are controlled by the windshield wiper/washer switch through a series of internal resistors, and the switch position determines the point on the resistor assembly where the reference voltage is applied. The windshield wiper switch signal circuit supplies the signal voltage from the switch assembly to the wiper motor module which determines the operating mode. Windshield wiper motor high speed operation is controlled by the windshield wiper/washer switch through the windshield wiper switch high signal circuit. The windshield wiper switch high signal circuit is supplied 12 volts by the wiper motor module and when the wiper/washer switch is turned to the HIGH position the windshield wiper switch high signal circuit is grounded. The windshield washer pump is controlled by the wiper motor module through the windshield washer relay. The windshield washer relay coil and switch is supplied battery positive voltage, and during WASH mode the wiper motor module grounds the washer relay control circuit energizing the relay. While the relay coil is energized battery positive voltage to the switch side of the relay is supplied to the washer pump control circuit.