Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 173 (WIPER SYSTEM AND WASHER SYSTEM)SYSTEM TESTSTEST G: WIPER BLADES DO NOT PARK
1999 GMC Forward Control 5.7 R, Automatic
Test G: Wiper Blades Do Not Park
1999 GMC Forward Control 5.7 R, AutomaticSECTION Test G: Wiper Blades Do Not Park
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- If wiper/washer system description and operation has been reviewed and preliminary inspection has been performed, go to next step. If wiper/washer system description and operation has not been reviewed and preliminary inspection has not been performed, go to DESCRIPTION & OPERATION and DIAGNOSTIC STARTING POINT under TROUBLESHOOTING.
- Turn ON the ignition, with the engine OFF. Move the wiper switch to the LO position. Move the wiper switch to the OFF position. Do the front wipers advance to the park position? If so, condition is intermittent. See INTERMITTENTS under TROUBLE SHOOTING. If not, go to next step.
- Turn the ignition switch to the RUN position. Turn the wiper switch to OFF. Disconnect the wiper/washer switch connector. Do the wipers park? If so, go to step 7 . If not, go to next step.
- At the wiper/washer switch connector, measure the voltage of the windshield wiper switch signal 2 circuit (Dark Green wire). Does the voltage measure greater than 1.0 volts? If so, go to next step. If not, go to step 8 .
- Reconnect the wiper/washer switch connector. Disconnect the wiper motor connector. Measure the voltage of the windshield wiper switch signal 2 circuit (Dark Green wire). Does the voltage measure greater than 1.0 volts? If so, go to next step. If not, go to step 8 .
- Repair short to battery positive voltage in the windshield wiper switch signal 2 circuit (Dark Green wire). After repairs are complete, go to step 9 .
- Replace the wiper/washer switch. See WIPER/WASHER SWITCH under REMOVAL & INSTALLATION. After repairs are complete, go to step 9 .
- Replace the wiper motor cover. See WIPER MOTOR COVER (CIRCUIT BOARD) under REMOVAL & INSTALLATION. After repairs are complete, go to step 9 .
- Operate the system in order to verify the repair. Did you correct the condition? If so, system is okay. If not, go to step 2 .
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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.