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.
Vehicle Information Storage
The BC1 stores the total mileage and service interval data (SIA) in memory as back up for the IKE; this function is identical to that of the light switch center (LSZ) on the E46.
The Vehicle Identification Number (VIN) is entered during coding of the BC1 and can only be over-written if the total mileage is less than 100 km. The VIN's stored in the IKE and BC1 are checked each time the ignition is switched on.
The mileage and SIA data is also updated in the BC1 after 100 km of continuous driving.
The BC1 will not accept mileage from the IKE if the value stored is over 1000 km less than that stored in the IKE. If this occurs the BC1 must be replaced.
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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