VOLVO
IHU-B12A012 - Auxiliary Input 2. General Electrical Failures. Circuit short to battery
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) monitors voltage on the AUX2 output's signal wires. The code is stored when the voltage on the signal wire is too high, which points to a short-circuit to supply voltage.
Possible causes
- The signal wire is short-circuited to supply voltage
What you can do
- 1Read and clear the code, then check whether it returns
- 2Check that the fuses are intact
- 3Disconnect the accessory from the AUX input and see whether the code clears
- 4Check the AUX cable for chafing or damage, especially where it may have touched a live wire
- 5If the fault remains, have a workshop trace the AUX input and the wiring further
Symptoms you may notice1
- The AUX panel does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.