Flap motors

The flap motors are activated and supplied with voltage and ground across the LIN bus by the corresponding control unit (IHKA control unit, HKA control unit). In the rest state, the control unit switches the supply voltage off.

The flap motor is fitted with an integrated circuit. This circuit controls the coil of the flap motor. The circuit has bus- and diagnosis capabilities. After activation of the flap motor, the integrated circuit sends position feedback (actual position) to the control unit. The flap motors communicate across the LIN bus with the HKA control unit. The flap motors are switched in series on the LIN bus. Each flap motor is assigned a certain address. The address determines which function the flap motor assumes in the system network. This address tells e.g. the rear right footwell flap motor that messages are being addressed to it (e.g. 'open flap'). This address tells e.g. the IHKA control unit which flap motor has sent it a fault message.