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.
1992 GMC Safari Van Cargo, 4.3 Z, AWDFACTORY OEM SERVICE PROCEDURE
Wipers Inoperative In All Modes
- Turn ignition switch to ACC position. Connect test light between ground and White wire terminal of wiper switch connector. See Fig 1 . If test light does not come on, repair open in White wire between wiper switch and fuse.
- If test light comes on, connect test light between ground and Gray wire terminal of wiper switch connector with wiper switch in LOW position, and at Purple wire with wiper switch in HIGH position. If test light does not come on at one or both wires, replace wiper switch.
- If test light comes on at both wires, disconnect wiper motor connector. Connect fused jumper wire between battery positive terminal and Gray wire terminal of wiper motor connector. If wipers do not operate, repair or replace wiper motor. If wipers operate, repair open in White or Purple wire between wiper switch and wiper motor.
Factory Service Tools
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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.
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