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 BUS or the connection to the gauge control module is disconnected, an error code is shown with the number of blinks of the front individual map light and ceiling light.

Switch Input Check (Test Mode 2): 

When the input of a switch or a sensor to the MICU changes, diagnosis of the input system can be performed on the basis of the front individual map light and ceiling light flashing count.

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, and transmit forced commands during output function tests.