Honda Pilot: 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 or the door multiplex control unit is disconnected, an error code is shown with the number of blinks of the individual map lights.

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 individual map 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, or transmit forced commands during output function tests.

Multiplex Integrated Control System Description - Failsafe Function

Hardware Failsafe Control

When a CPU problem or an abnormal power supply voltage is detected, the MICU moves to the hardware failsafe mode, and each system output load is set to the pre-programmed failsafe value.

Software Failsafe Control

When any of the data from the B-CAN circuit cannot be received within a specified time, or an unusual combination of the data is recognized, the MICU moves to the software failsafe mode. The data that cannot be received is forced to a pre-programmed value.

Multiplex Integrated Control System Description - Failsafe Function

Hardware Failsafe Control

When a CPU problem or an abnormal power supply voltage is detected, the MICU moves to the hardware failsafe mode, and each system output load is set to the pre-programmed failsafe value.

Software Failsafe Control

When any of the data from the B-CAN circuit cannot be received within a specified time, or an unusual combination of the data is recognized, the MICU moves to the software failsafe mode. The data that cannot be received is forced to a pre-programmed value.

Multiplex Integrated Control System Description - Overview

The MICU (built into the under-dash fuse/relay box) is one of the B-CAN components. The MICU controls many systems related to the body controller area and security system, and also works as a gateway to diagnose the other B-CAN connected ECUs with the HDS.

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