Sunroof System Function

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

The roof opening panel motor and the shield motor are hard wired to both the BCM and the roof opening panel control switch. The only function of the BCM is to provide battery voltage and accessory delay voltage to the roof opening panel motor and battery voltage only to the shield motor. Both motors are interchangeable with the shield having one extra ground circuit which determines that it is the shield motor and that the roof opening panel motor is the master motor. The 2 motors communicate on a K Bus for interaction but there is no vehicle communication with the motors. The K Bus is only for communication between the motors and is not used for diagnostics. The roof opening panel control switch is hard wired to the roof opening panel motor with a sunroof open circuit, sunroof close circuit and a tilt/vent switch circuit. When the roof opening panel control switches are pressed a ground signal is sent to the roof opening panel motor to activate the respective switch request. The shield open and close switches are hard wired to the shield motor and operate the same as the roof opening panel motor.