A calibration status is stored on the DDE control unit indicating whether or not the multifunction steering wheel or air conditioning is fitted.
Matching has the function of activating/deactivating fault recognition in the DDE for the assemblies multifunction steering wheel and air conditioning.
Example: If the multifunction steering wheel calibration status is ”Fitted” and the multifunction steering wheel is not fitted on the vehicle, fault detection is active on the DDE and a fault code is always stored in the fault memory due to the absence of the multifunction steering wheel signal.
The DDE control unit automatically detects from the signals it receives that a multifunction steering wheel or air conditioning is fitted.
If the DDE control unit does not receive any signals from the multifunction steering wheel or air conditioning, it cannot determine on its own whether this is due to a fault or the fact that those items are actually not present . The calibration status then remains set to ”Fitted” and fault monitoring for the system concerned is active.
If the calibration status for one of the two assemblies is ”Fitted”, but the assembly is not actually fitted, there will be an unjustified entry in the fault memory for that assembly.
Remedy: the calibration function allows the calibration status to be reset. It enables the DDE control unit to relearn the correct fitted status, thereby preventing unjustified fault registration.