AHL Control Unit Diagnostic Mode
WARNING: This page does not describe the selected car, but rather 37 other vehicles, including the 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, 2005 BMW 330xi, and 2005 BMW 330i. However, it is still accessible from the selected car via links, so may be relevant.
For the following diagnostic operations, the AHL control unit must be set to diagnostic mode:
- Reading off relevant bus signals at a standstill shows whether or not the following signals are present:
- Road speed
- Yaw rate
- Steering angle
- Check whether messages are received by the AHL control unit:
- Check AHL control unit inputs
- Check whether the AHL control unit is receiving any valid signals via the K CAN
- Check whether switch-on conditions for the adaptive headlights are satisfied:
- Rain-light sensor status
- Light switch status
Faults are stored as follows:
- Faults in the stepper motors etc. are fed to the AHL control unit by the stepper motor controllers (SMCs) and stored in the AHL control unit.
- The AHL control unit reports these faults in response to the status request (e.g. "communication with left-hand headlight failed").
- Missing bus signals and missing signals from components are stored in the AHL control unit.