VOLVO
IHU-U024100 - Utebliven kommunikation med styrenhet huvudstrålkastare (HCM). General Failure Information. No sub type information
System
Infotainment Head Unit (IHU)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The head unit (IHU) continuously receives information from the headlamp control module (HCM) over CAN. The code is stored when communication with the HCM stops, which can affect the headlamp steering adjustment.
Possible causes
- A break in the communication line
- A short-circuit to ground in the communication line
- A short-circuit to supply voltage in the communication line
- Contact resistance, oxidation or breaks in the connections
What you can do
- 1Clear the code and check whether it returns
- 2Check that the fuses are intact
- 3Check the communication line for chafing, damage and loose connectors
- 4Use a multimeter to check that the communication line has no break and no short-circuit to ground or supply voltage
- 5If the fault remains, have a workshop trace the headlamp control module (HCM) and the communication line further
Symptoms you may notice1
- Headlamp steering adjustment on steering angle is incorrect or does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.