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.
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HOMESERVICE MANUALSBMW2011X5 50IREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSFUNCTIONAL DESCRIPTION - ANTI-THEFT, BODY ELECTRICAL, CHASSIS/SUSPENSION, CRUISE CONTROL, EXTERIOR LIGHTING, GLOVEBOX & HEADLINING SYSTEMSANTI-THEFT SYSTEM - FUNCTIONAL DESCRIPTIONCAR ACCESS SYSTEM (CAS)SERVICE FUNCTIONSREPLACING CONTROL UNITS
2011 BMW X5 50i
Replacing control units
2011 BMW X5 50iSECTION Replacing control units
The following points must be borne in mind when the CAS or the engine control unit are renewed:
- If a CAS control unit is renewed, it must be ordered using the vehicle identification number (VIN). Following installation, that starting value must be adjusted to the engine control unit. This starting value adjustment is performed using the service function "DME/DDE - CAS calibration" in the BMW diagnosis system.
- If the engine control unit is renewed, the drive-enable code must be transferred from the CAS to the engine control unit following installation. This procedure is also performed using the service function "DME/DDE - CAS adjustment" in the BMW diagnosis system.
- After the adjustment of the EWS and engine control unit, these are mutually linked. It is not possible to replace one of the two control units as a test.
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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.