A/C and AV Switch Self-Diagnosis Function: Description: Notes
WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
It can check ON/OFF operation of each switch in the A/C and AV switch and diagnose the input signals to the steering switch (audio).