K 2500 Suburban 4WD V8-5.7L VIN R (1999)
Accessory Delay Module: Description and Operation
The Retained Accessory Power (RAP) system is a subsystem of the Body Control Module (BCM). It is designed to provide power to the following
accessories when the ignition is in the Run or Accessory position and up to 10 minutes of power when the ignition is cycled to the Off position.
^
Power Windows Circuit
^
Rear Window Wiper Circuit
^
Front Windshield Wipers Circuit
^
Radio Circuit
^
Courtesy Lamp Circuit
All components in the circuits powered by the RAP system will be enabled when the Ignition Switch is in the Accessory or Run position. Once the
Ignition Switch is turned to the Off position, and all doors remain closed, the components in these circuits will remain enabled for 10 minutes. Once any
of the doors open, the 10 minute timer is cancelled and power to these components is disabled.
In addition, anytime the the doors are opened, and remain opened while the Ignition Switch is in the Run position, the courtesy lights will come on for 10
minutes then turn off. The same holds true for the Glove Compartment Light when the Ignition Switch is in the Off position.
Power is supplied to the RAP System through CKT 342 (RED), from the IGN B fuse #5. Power is then sent out of the Body Control Module through
CKT 75 (DK BLU) to the I/P fuse block to power the PWR WDO CIRCUIT BREAKER; RR WIPER fuse #23; WIPER fuse #11; and RADIO fuse #17.
Control for the courtesy lamp feed runs through CKT 40 (ORN) from the Body Control Module and returns to the Body Control Module through CKT
157 (GRA), courtesy lamp return. Driver Door Jamb teed for the RAP System runs through CKT 159 (TAN) to the Body Control Module as does the
Passenger Door Jamb feed runs through CKT 328 (PPL) to the Body Control Module. The ignition switch feed for the RAP system comes from
GAUGES fuse #4 and runs through CKT 39 (PNK). Ground for the RAP system runs through CKT 150 (BLK) to ground G202.
