Multiplex Integrated Control System Description - Control/Function

Self-diagnostic Function

The MICU provides the self-diagnostic function for checking the communication and input systems.

Communication Check (Test Mode 1)

When the B-CAN is disconnected, or the connection to the gauge control module fails, or the door multiplex control unit fails, the error code is shown with the number of blinks of the ceiling light (ceiling light is DOOR position).

Switch Input Check (Test Mode 2)

When the input of a switch or a sensor to the MICU has changed, diagnosis of the input system can be performed on the basis of the ceiling light flashing count (ceiling light is DOOR position).

HDS Diagnostics

The HDS connects to the data link connector (DLC) to communicate with the vehicle's control units. This allows the HDS to retrieve DTCs, diagnostic data, or transmit forced commands during output function tests.