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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSMAIN RELAY - CONTROL (DME RELAY 2)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Main Relay - Control (DME Relay 2)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Main Relay - Control (DME Relay 2)
Check function:
[D] 100 - This status inquiry is only possible as of model '89. With ignition ON or during engine operation, the main relay is driven with ground potential at terminal 85 (display: ON). The relay switches on and supplies the control units DME, AEGS, EML and ABS with voltage.
Possible causes.
- Wire to DME control unit Pin 36 detective
- Relay 2 or voltage supply not OK.
- Voltage supply for DME control unit not OK.
- The control unit is defective it no ground potential is output at control unit Pin 36 although the above points are OK.
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.