MFL Messages

MFL Messages

The interface ECU outputs one of three MFL messages, RESUME, SET or OFF, on a serial link to the ECM. The power feed from the main relay to the interface ECU drives the MFL messages. While the master switch is selected off, only the OFF MFL message can be transmitted. When the master switch is selected on, the power feed from the switch enables the interface ECU to send either the SET or RESUME MFL messages, depending on the inputs from the steering wheel switches and the cruise control status message from the CAN bus. When the master switch is first switched on, the output of the RESUME message is automatically inhibited until after the first engagement of cruise control.