Impact of bus faults
If individual bus signals fail that are not stored in the fault code memory
Possible fault symptom or perception on failure of the corresponding bus signal |
Faulty or missing signal |
Transmitter control unit |
|---|---|---|
No air-conditioning function in the rear of car interior with MAX_AC for HKA ON / HKA OFF |
Bedienung_AC_Fond |
MMI_GT |
Cooler box in rear cannot be switched on/off with rear cooler box ON |
Bedienung_Kühlbox_Fond |
MMI_GT |
No function with undervoltage detection |
Spannung_Batterie |
PM |
No cooling system at front with current status IHKA ON / OFF |
Status_AC_Front |
IHKA |
No function as of terminal 15 active |
Status_Klemme 15 |
CAS |
Cutoff as long as start operation continues |
Status_Klemme 50 |
CAS |
Distribution of cold - less cold available in rear - with AC max? y/n. With coded function, MAX_AC is also activated on FKA when MAX_AC is activated on integrated automatic heating / air conditioning system. |
Spannung_Batterie |
IHKA |
No control operation / ventilation + heating |
Status_Motor_Läuft |
DDE1, DME1 |
No cooling function |
Steuerung_Kälteabsperrventil_Fond |
IHKA |
No cooling function |
Steuerung_Kälteabsperrventil_Front |
IHKA |
Temp. control reference, default value (0°C), no temperature-dependent control |
Temperatur_Außen |
Instrument cluster |
Temp. control reference, default value, no temperature-dependent heating |
Temperatur_Motor |
DDE1, DME1 |
Temp. control reference, no controlled cooling |
Temperatur_Verdampfer |
IHKA |
Fault code memory entry incomplete |
Wegstrecke_Kilometer |
Instrument cluster |
Abbreviations |
Full expression |
MMI |
Man-Machine Interface (Control Display) |
PM |
Power module |
IHKA |
Integrated automatic heating and air conditioning control unit |
CAS |
Car Access System |
DDE1, DME1 |
Digital Diesel Electronics 1, Digital Engine Electronics 1 |
LM |
Light module |
Instrument cluster |
Instrument cluster |