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.
Program Button
Check the program button with the aid of the universal adapter with the control unit connected and ignition switched on. Measure between pin No. 19 and the specified pins. See Fig 1 Or Fig 2 . Number "0" corresponds to approximately zero volt, and "1" corresponds to approximately 12 volts. If inputs in control unit are not plausible, check ground connection to program button (pin No. 5 on E36; pin No. 31 on E34) and repair if necessary. See Fig 3 Or Fig 4 . If okay, remove program button. Check in accordance with switch diagram and replace if necessary. If okay, check wire and plug connection. Repair as necessary. If okay, replace control unit.
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.