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.
Notes for service technicians
The ACC sensor and the ACC control unit are one component. Short-range sensors are no longer installed. The function of the short-range sensors is now handled by the ACC sensor.
The ACC requires an ICM control unit (Integrated Chassis Management) or an LDM control unit (Longitudinal Dynamics Management) in addition to the ACC control unit. These control unit are then installed as follows:
- In the X6 an LDM control unit is installed as well as the ACC control unit. In addition, there is also another ICM control unit which is not however used for the ACC function!
- In the X5 an LDM control unit is installed as well as the ACC control unit.
- On all other vehicles, an ICM control unit is installed as well as the ACC control unit.
Observe the following information in Service:
- The diagnosis for the ACC control unit are performed by the ICM control unit or the LDM control unit. The ICM control unit or LDM control unit is therefore a gateway for the ACC control unit. If the ICM control unit or LDM control unit is faulty or not connected, diagnosis cannot be carried out with the ACC control unit: The control unit does not respond.
- After any replacement, the ICM control unit or LDM control unit needs to be encoded again.
- After replacement, the ACC control unit must be recoded.
- In connection with frontal damage on the vehicle, make sure that the holder for the ACC control unit is not bent.
- After the ACC control unit is renewed, the unit must be put into operation again. Use the corresponding service function. The sensor does not require any mechanical setting.
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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.