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.
1985 BMW 635CSi AutomaticFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS Control Unit | Below right side windshield. See Figure. |
| Central Locking Control Unit | Under dash, above and to left of glove box. |
| Cruise Control Unit | Under dash, above and to left of glove box. |
| Idle Speed Control Unit | Under right side of dash, above glove box. |
| Lock Heater Control Unit | In left front door. See Figure. |
| Motronic Control Unit | Under right side of dash, above glove box. See Figure. |
| On-Board Computer | Under left side of dash, on dash frame. See Figure. |
| Transistorized Speed Control Unit | On the right side of the blower housing. |
| Windshield Wiper Control Unit | In main fuse/relay box. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
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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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