Originally Posted by oritpro
Out of curiosity, why on earth would the IPC act as a gateway between the APIM and HVAC module?
There are 3 can buses: HS-CAN (High Speed), MS-CAN (Medium Speed), and I-CAN (Infotainment).
There are 2 gateway modules: BCM (HS-CAN <> MS-CAN) and the IPC (MS-CAN <> I-CAN).
The service manual is very clear that the IPC is used as a gateway for communication between the APIM and the HVAC.
However, I don't know exactly why it was done this way considering that the APIM is the only module in the car that is connected to all 3 buses directly.