Schematic Reference: Wiper/Washer Schematics

DEFINITION: The rear wiper motor is inoperative in one or more modes, the rear washer pump may or may not operate.

Did you review the Rear Wiper/Washer System Description and Operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms - Wiper/Washer Systems

1. Turn the ignition ON.
2. Operate the rear wiper/washer system in all the switch positions.

Does the rear wiper/washer system operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Does the rear wiper motor operate when the rear washer switch is pressed?

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Go to Step 6

Go to Step 4

1. Disconnect the rear wiper motor connector.
2. Connect a test lamp from the rear wiper motor battery voltage supply circuit terminal in the wiper motor harness connector to a good ground.
3. Turn the ignition ON.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 10

1. Connect a test lamp from the rear wiper motor battery voltage supply circuit terminal to the ground circuit terminal in the wiper motor harness connector.
2. Turn the ignition ON.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 11

1. Disconnect the rear wiper motor connector.
2. Connect a test lamp from the rear wiper switch signal circuit terminal in the wiper motor harness connector to ground.
3. Turn the ignition ON.
4. Operate the rear wiper/washer switch to the 1 position.

Does the test lamp illuminate?

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Go to Step 7

Go to Step 9

1. Disconnect the rear wiper/washer switch connector.
2. Operate the rear wiper/washer switch to the 2 position.
3. Measure the resistance through the rear wiper/washer switch from the accessory voltage supply circuit terminal to the rear wiper switch signal circuit terminal.

Is the resistance at or near the specified value?

1000 ohms

Go to Step 8

Go to Step 13

1. Using a DMM measure the voltage from the negitive side rear window defogger grid terminal to a known good ground. Refer to Measuring Voltage Drop in Wiring Systems.
2. Turn the rear window defogger on.

Is the voltage measurement less than the specitied value?

0.5 V

Go to Step 15

Go to Step 11

Test the rear wiper switch signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 12

Repair the rear wiper motor accessory voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 17

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Repair the rear wiper motor ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 17

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Test the rear wiper/washer switch accessory voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 13

Inspect for poor connections at the rear wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 14

Replace the rear wiper/washer switch. Refer to Accessory Switch Replacement in Instrument Panel, Gages, and Console.

Is the repair complete?

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Go to Step 17

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Inspect for poor connections at the rear wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 16

Replace the rear wiper motor. Refer to Rear Window Wiper Motor Replacement .

Is the repair complete?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3