Sunroof Description and Operation (Coupe)

Sunroof Description and Operation (Coupe)

Power Sunroof System Components

The Power Sunroof and Sunshade System consists of the following components:

* Sunroof control module

* Sunroof shade module

* Sunroof switch

* Sunroof shade switch

* Sunroof window

* Sunshade panel

* Rail and track assembly upon which the sunroof and sunshade glass rides

* S/ROOF or SUNSHADE Fuse 30 A

* Body control module (BCM)

Power and Grounds

Battery positive voltage is supplied at all times to the sunroof control and sunroof shade modules from the 30 A S/ROOF or SUNROOF Fuse located in the rear or underhood fuse block, respectively. Ground is supplied to the sunroof control and sunroof shade modules through the body ground circuit G401.

Ground is supplied to the sunroof and sunroof shade switch through the body ground circuit G401.

Power Sunroof Operation

The Power Sunroof System will operate only with the ignition turned to the RUN or Accessory position, this allows for retained accessory power (RAP) control of the sunroof and sunshade through the body control module (BCM). With the ignition in the run or accessory position, the BCM supplies the sunroof control and sunroof shade modules with ignition voltage which allows sunroof and sunshade operation. Once the ignition switch is turned to OFF the sunroof and sunshade will continue to operate until any door is opened or when the RAP timer reaches its shut-off limit. For a description and operation of the RAP operation, refer to Retained Accessory Power Description and Operation Retained Accessory Power.

Sunshade Switch

The sunshade switch assembly contains two rocker type switches that are used to control the following functions:

* Express open - A momentary press of the switch will automatically open the sunshade. To stop the sunshade partway, press the switch a second time.

* Express close - A momentary press of the switch will automatically close the sunshade. To stop the sunshade partway, press the switch a second time.

Sunroof Switch

Press and hold the front of the switch to vent the sunroof. The sunshade will automatically open approximately fifteen inches. Press and hold the rear of the switch to close the sunroof vent.

Sunroof and Sunshade Modules

The sunroof control and sunroof shade module assemblies have internal bi-directional motors and hall effect sensors. The hall effect sensors create pulses that are counted by the modules until the end of travel position is reached.

Sunshade Operation

The sunroof shade module determines the sunshade motor direction based on inputs received from the sunroof shade switch. The sunroof shade module controls the sunshade motor direction by changing the polarity of the applied voltage.

In addition, during sunroof or vent open operation, the sunroof control module sends a message through the K-Bus circuit to the sunroof shade module to open the sunshade while the glass panel is being commanded open. The sunshade will not fully close unless the sunroof is completely closed. If there is a problem with the K-Bus circuit signal the sunshade will not operate when commanded.