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.
1979 BMW 633CSi Automatic TransFACTORY OEM SERVICE PROCEDURE
Top Gear Switch
- With ignition switch in the "ON" position and engine stopped, shift transmission into 4th gear. Disconnect electrical connector from electromagnetic switching valve.
- Connect a test light to terminals of switching valve connector. Test light should come on when transmission is in 4th gear and go out when transmission is shifted out of 4th gear. If not, top gear switch is defective and should be replaced.
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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