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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 752 (WIPER SYSTEM & WASHER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESWIPERS INOPERATIVE - ALL MODES
1999 GMC Forward Control 5.7 R, Automatic

Wipers Inoperative - All Modes

1999 GMC Forward Control 5.7 R, AutomaticSECTION Wipers Inoperative - All Modes
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.
Wipers Inoperative - All Modes

Step Action 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 switch 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
  1. Disconnect the windshield wiper motor connector.
  2. Connect a test lamp from the accessory voltage supply circuit terminal in the harness connector to a good ground.
  3. Turn the ignition ON.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 7 
4
  1. Connect a test lamp from the accessory voltage supply circuit terminal to the ground circuit terminal in the windshield wiper motor harness connector.
  2. Turn the ignition ON.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 8 
5
  1. Connect a test lamp from the windshield wiper switch signal 2 circuit terminal in the windshield wiper motor harness connector to ground.
  2. Turn the ignition ON.
  3. Press the windshield washer switch.
Does the test lamp illuminate?		 Go to Step 10  Go to Step 6 
6
  1. Disconnect the windshield wiper/washer switch connector.
  2. Connect a test lamp from the accessory voltage supply circuit terminal in the windshield wiper/washer switch harness connector to ground.
  3. Turn the ignition ON.
Does the test lamp illuminate?		 Go to Step 11  Go to Step 9 
7 Repair the windshield wiper motor accessory voltage supply circuit for an open or short to ground. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Is the repair complete?		 Go to Step 12  -
8 Repair the windshield wiper motor ground circuit for an open or high resistance. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Is the repair complete?		 Go to Step 12  -
9 Repair the windshield wiper/washer switch accessory voltage supply circuit for an open or short to ground. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Is the repair complete?		 Go to Step 12  -
10 Replace the windshield wiper motor. Refer to Wiper Motor Replacement .
Is the repair complete?		 Go to Step 12  -
11 Replace the windshield wiper/washer switch. Refer to Wipers/Washer Switch Replacement .
Is the repair complete?		 Go to Step 12  -
12 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.