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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMS, SYSTEM SPECIFICIHKA (AUTOMATIC CLIMATE CONTROL SYSTEM)WINDSCREEN HEATING
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Windscreen Heating
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Windscreen Heating
Note: Windscreen heating is no longer fitted during the course of model year 1990.
Operation
If the ignition is switched on and the outside temperature is less than 5°C (41°F), the IHKA control unit switches the windscreen heating relay and the heating element heats up. The windscreen heater remains switched on for as long as the value of the outside temperature sensor of the IHKA is less than 8°C (43°F). The windscreen heater is switched off when the outside temperature increases to above 8°C (43°F).
Operation
If the ignition is switched on and the outside temperature is less than 5°C (41°F), the IHKA control unit switches the windscreen heating relay and the heating element heats up. The windscreen heater remains switched on for as long as the value of the outside temperature sensor of the IHKA is less than 8°C (43°F). The windscreen heater is switched off when the outside temperature increases to above 8°C (43°F).
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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.