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 MANUALSMERCURY1994COUGAR 3.8 4, 4R70WREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSDEFOGGER - REAR WINDOWTESTINGCONTROL ASSEMBLY TEST
1994 Mercury Cougar 3.8 4, 4R70W
Control Assembly Test
1994 Mercury Cougar 3.8 4, 4R70WSECTION Control Assembly Test
- Unplug connector from control unit. Ground control unit pin No. 4. Connect jumper wire between control unit pins No. 2 and 3. See Fig 1. Connect test light between pin No. 1 and ground.
- Using a fused jumper wire, connect battery voltage to pin No. 2. Test light should not come on. Connect battery voltage to pin No. 5. Rear window symbol on switch should come on.
- Momentarily press rocker switch. Indicator should come on and stay on after rocker switch returns to normal position.
- Indicator should go off only if rocker switch is pressed again, jumper wire is removed from between pins No. 2 and 3, or approximately 10 minutes have elapsed. Replace control unit if test results are not as specified.
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.