RAP Relay (if equipped)

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The long base vehicles (GMT370), with third row seating, will have a RAP relay (RAP relay is also on the G/H Van). Due to this, the BCM will power/enable a relay. On the short based vehicles (GMT360), the RAP output only needs to drive the sunroof. The BCM is able to supply enough current to operate the sunroof by itself, so a relay is not needed. Although, on the GMT370/longbase vehicle, there are optional powered rear quarter vent windows, which are also enabled in RAP power mode. Refer to Retained Accessory Power (RAP) Schematics for the applicable schematics for RAP on both vehicle types. On the GMT370/longbase vehicle, the BCM is not able to supply enough current to both rear quarter vent windows and the sunroof at the same time (if equipped with both options). This is the purpose of the RAP relay. The BCM energizes the RAP relay coil, which allows a fused power supply to the sunroof and the rear quarter vent windows.