VOLVO
IHU-B108786 - LIN Bus A. General Signal Failures. Signal stuck low
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?
Button status on the wheel is checked by the infotainment head unit (IHU) over LIN. The code is stored when the message received is not the one expected.
Possible causes
- A fault in the transmitting control module, the one that sends the steering wheel button signals
What you can do
- 1Clear the code and check whether it returns
- 2Check that the fuses are intact
- 3Switch the ignition on, or start the engine if needed, so that all units on the bus get power and communication starts, then read the code again
- 4If you have a diagnostic tool: check in live data whether the steering wheel button value updates when you press one button at a time
- 5If the fault remains, have a workshop trace the LIN bus further
Symptoms you may notice1
- Audio functions from the steering wheel do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.