An interface error is stored in the LDM control unit (see also test module on the right).
For the LDM function, information from partner control units is essential. The fault is entered if the relevant partner control unit (= interface to the LDM) sends a default value or invalid ID instead of the required information to the LDM and this impairs the LDM function. In this case, a fault code memory entry should also be made in the corresponding partner control unit.
For this fault, the cause does NOT lie in the LDM control unit or in the LDM software!
Possible causes of fault:
- the relevant partner control unit is not yet operational
- the sensor system of the relevant partner control unit is defective
- general malfunction of the partner control unit
Read the fault code memory of the relevant partner control unit and continue troubleshooting according to test plan in the relevant partner control unit. Delete fault code in LDM control unit.
If work is currently being carried out on the vehicle and this causes the interface error in the LDM, under certain circumstances the corresponding fault code memory entry can only be made in the partner control unit after a terminal change. If necessary, run a terminal change.
If no fault is stored in the relevant partner control unit, it can be assumed that there is a sporadic fault. There is no repair measure available for this case: Delete fault code in LDM control unit.
Note on deleting the fault code memory
Under certain circumstances, the fault in the LDM can only be deleted after a terminal change. In this case, switch the ignition off, wait 10 seconds, switch the ignition on again and then delete the fault.