Sunroof Motor - Operation

OPERATION

The single pane and 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 Totally Integrated Power Module (TIPM) 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.

The hard wired circuits of the power sunroof and power sunshade motors as well as those between the electronic modules and switches may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic module integral to the power sunroof and power sunshade motors. If the power sunroof or power sunshade switches and the hard wired circuitry test okay, but the motor or the express or Excess Force Limitation (EFL) features are still ineffective following the calibration and initialization procedures, the motor and module must be replaced as a unit.