Module, Power Sunroof (PSM): Operation

WARNING: This page is about a different car, the 2021 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The dual pane power sunroof and power sunshade motors are each completely controlled by the circuitry of their respective on-board electronic module. The module receives battery current on a fused B(+) circuit from the Body Control Module (BCM) and has a path to ground at all times through a take out and eyelet terminal connector secured by a ground screw to the body sheet metal. These connections allow the module to function regardless of the ignition switch position.

However, the modules both monitor an input on a fused ignition switch output (run - accessory) circuit, and provide a source current to the sunroof and sunshade switches in the overhead console only when the ignition switch is in the ON or ACCESSORY positions, or while the accessory delay feature is active. The modules then monitor a separate input circuit for each switch position, which it uses to determine the proper outputs to the power sunroof or power sunshade motor. A positive and negative battery connection to the two motor brushes will cause the power sunroof or sunshade motor to rotate in one direction. Reversing the current through these same two brushes will cause the motor to rotate in the opposite direction.