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 MANUALSBMW1992850I AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF DIAGNOSTICSCOMPONENT TESTSDME MAIN RELAYCHECK FUNCTION
1992 BMW 850i Automatic
Check Function
1992 BMW 850i AutomaticSECTION Check Function
With ignition ON or during engine operation, main relay is actuated with ground potential at terminal No. 85 (display: ON). The relay switches on and supplies voltage to DME, EGS, EML and ABS control units.
RENDER: 1.0x
NO RELATED
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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.