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.
Body Control Unit: Operation: Notes
For IDM inputs which are also inputs for BCU functions, the delay before the BCU recognizes the change in input status is less than 250 ms. The BCU uses a de-bounce algorithm to ignore changes in input having a duration less than 100 ms with the exception of automatic gearbox W, X, Y, Z inputs, which have a de-bounce period of 33 ms.
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.