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Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 7:  This step tests for continuity through the 24K-Ω resistor in the windshield wiper/washer switch. The connector behind the instrument panel knee bolster is suitable for performing this step.
  2. 8:  This step tests for continuity through 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.
Wipers Inoperative - One or More Modes

Step Action Value(s) Yes No
Schematic Reference:  Wiper/Washer System Schematics  
Connector End View Reference:  Wiper/Washer System Connector End Views  
1 Did you review the Wiper/Washer System Description and Operation and perform the necessary inspections? - Go to Step 2  Go to Symptoms - Wiper/Washer Systems 
2
  1. Turn the ignition ON.
  2. Operate the windshield wiper/washer switch through all the switch positions.
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 in the high speed mode? - Go to Step 5  Go to Step 4 
4
  1. Disconnect the windshield wiper motor connector.
  2. Connect a test lamp from the windshield wiper motor high speed circuit terminal to ground.
  3. Turn the ignition ON.
  4. Operate the windshield wiper/washer switch to the high speed position.
Does the test lamp illuminate?		 - Go to Step 14  Go to Step 9 
5
  1. Disconnect the windshield wiper motor connector.
  2. Connect a test lamp from the windshield wiper switch signal 2 circuit terminal to ground.
  3. Turn the ignition ON.
  4. Press the windshield washer switch.
Does the test lamp illuminate?		 - Go to Step 6  Go to Step 10 
6
  1. Connect a test lamp from the windshield wiper switch signal 1 circuit terminal to ground.
  2. Operate the windshield wiper/washer switch to the following positions:
    • MIST
    • LO
    • HI
Does the test lamp illuminate in the listed switch positions?		 - Go to Step 7  Go to Step 11 
7 
  1. Disconnect the windshield wiper/washer switch connector.
  2. Measure the resistance through the windshield wiper/washer switch from the signal 2 circuit terminal to the accessory voltage supply circuit terminal in the wiper/washer switch connector.
  3. Operate the windshield wiper/washer switch to the following positions:
    • MIST
    • INT
    • LO
    • HI
Is the resistance at or near the specified value in all the listed switch positions?		 24K Ω Go to Step 8  Go to Step 12 
8 
  1. Measure the resistance through the windshield wiper/washer switch from the signal 1 circuit terminal to the accessory voltage supply circuit terminal in the wiper/washer switch connector.
  2. Operate the windshield wiper/washer switch through all of the delay positions.
Does the resistance remain within the specified values from high to low as the delay speed is increased?		 38K - 690K Ω Go to Step 14  Go to Step 12 
9 Test the windshield wiper motor high speed circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
10 Test the windshield wiper switch signal 2 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 16  Go to Step 12 
11 Test the windshield wiper switch signal 1 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 16  Go to Step 12 
12 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 16  Go to Step 13 
13 Replace the windshield wiper/washer switch. Refer to Wipers/Washer Switch Replacement .
Is the repair complete?		 - Go to Step 16  -
14 Inspect for poor connections at the windshield wiper motor. 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 16  Go to Step 15 
15 Replace the windshield wiper drive system module. Refer to Wiper Drive System Module Replacement .
Is the repair complete?		 - Go to Step 16  -
16 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 3 
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