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.
1990 BMW M3FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| ABS Electronic Control Unit | Above hood release. See Figure . |
| ABS Hydraulic Unit | In front of left front wheelwell. See Figure . |
| Active Check Control Unit | Above rear view mirror. |
| Central Locking Control Unit | At left kick panel. See Figure . |
| Chime Module | Mounted on left dash hush panel. |
| Cruise Control Unit | Above glove box. See Figure . |
| Evaporator Temperature Regulator | On left side of evaporator housing. |
| Evaporator Temperature Sensor | On left side of evaporator housing. |
| Interior Light Timer Control | Below left front speaker. See Figure . |
| Lock Heater Control Unit | At top rear of left door. |
| Motronic Control Unit | Above glove box. See Figure . |
| On-Board Computer Module | Behind center of dash. See Figure . |
| SRS Diagnostic Module | Above ABS electronic control unit. See Figure . |
| Wiper Control Unit | In power distribution box. See Figure . |
Factory Service Tools
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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.
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