Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests for continuity through the 24K ohms resistor and the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from high to low as the delay speed is increased. The connector behind the instrument panel knee bolster is suitable for performing this step.
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This step tests for the wipe command from the moisture sensor. The signal voltage will alternate from approximately 0.03 volts to 7.0 volts when the windshield has sufficient moisture accumulation to activate a wipe command.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Wiper/Washer Schematics | ||||
1 | Did you review the Wiper/Washer System Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 | Verify the fault is present. Does the windshield wiper/washer system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Do the windshield wipers operate at low speed in any of the delay switch positions? | -- | Go to Step 13 | Go to Step 4 |
4 | Do the windshield wipers continuously cycle in and out of the park position in all of the delay switch positions? | -- | Go to Step 15 | Go to Step 5 |
5 |
Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 17 |
6 | Connect a test lamp from the accessory voltage supply circuit terminal to the ground circuit terminal in the moisture sensor harness connector. Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 18 |
7 |
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 8 |
8 | Test the windshield washer 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? | -- | Go to Step 25 | Go to Step 19 |
9 |
Is the voltage at or near the specified value? | 5.0 V | Go to Step 12 | Go to Step 10 |
10 | Test the windshield wiper switch low 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? | -- | Go to Step 25 | Go to Step 11 |
Is the resistance measurement infinite in any switch position? | -- | Go to Step 19 | Go to Step 23 | |
Does the voltage momentarily increase? | -- | Go to Step 21 | Go to Step 23 | |
13 |
Does the test lamp illuminate in any of the delay switch positions? | -- | Go to Step 14 | Go to Step 21 |
14 | Test the windshield wiper motor low speed circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 19 |
15 |
Does the test lamp illuminate? | -- | Go to Step 16 | Go to Step 21 |
16 | Test the windshield wiper switch high signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 23 |
17 | Repair the accessory voltage supply circuit to the moisture sensor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 25 | -- |
18 | Repair the moisture sensor ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 25 | -- |
19 | Inspect for poor connections at the windshield 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? | -- | Go to Step 25 | Go to Step 20 |
20 | Replace the windshield wiper/washer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column. Is the repair complete? | -- | Go to Step 25 | -- |
21 | Inspect for poor connections at the windshield wiper motor module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 22 |
22 | Replace the windshield wiper motor module. Refer to Wiper Motor Cover Replacement . Is the repair complete? | -- | Go to Step 25 | -- |
23 | Inspect for poor connections at the moisture sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 24 |
24 | Replace the moisture sensor. Refer to Windshield Outside Moisture Sensor Replacement . Is the repair complete? | -- | Go to Step 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
