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 MANUALSPORSCHE1982928 AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALBODY ELECTRICALREAR WINDOW DEFOGGERTESTINGSYSTEM TESTING
1982 Porsche 928 Automatic Trans
System Testing
1982 Porsche 928 Automatic TransSECTION System Testing
- Check that all in-line fuses or circuit breakers are operational. Turn ignition and control switches on. Check rear window glass temperature after a few minutes. Glass should feel warm to the touch.
- If not, use a test lamp or voltmeter to check for battery voltage at grid feed wire. If voltage is not correct, check the wiring harness, control switch or the timer/relay.
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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.