Safety functions
Power to the relays and electronics is controlled directly by the control buttons. When the seat is not being operated all power to the motors is cut to ensure that the seat stops moving.
If more than one button is operated at the same time, the seat will stop. The only motors which can be operated simultaneously are those controlling the seat cushion height.
If an open-circuit, short-circuit to ground or supply occurs in the leads to the motors or sensors, this will be detected when trying to operate the motor because the sensor signal will not change. The motor concerned is then disabled.
If a button is held down for longer than 60 seconds, the power is cut to the main relay.
This function is controlled by a timer circuit in the control module.