Retained Accessory Power (RAP) Power Mode
RAP is a power mode that permits the operation of selected customer convenience
items for 10 minutes after the ignition switch is turned OFF. RAP
power mode is enabled by the BCM.
The BCM:
Controls certain body functions.
Some BCM features, such as the interior courtesy lamps will function
after the 10 minute RAP time limit has elapsed. This is normal, and
does not mean RAP power mode is malfunctioning. The BCM enables the following
functions in RAP Power Mode:
| • | The sunroof (internal to BCM -- if equipped) |
| • | The right and left power windows front and rear (internal to BCM --
if equipped) |
RAP is disabled when:
| • | A low battery voltage is detected by the BCM. |
| • | The transition of ignition switch from OFF to ON or ACC. |
| • | 10 minutes have elapsed after the ignition was turned OFF. |
| • | There may be some functions of the vehicle that are hard-wired straight
to the battery, these are the exceptions. |
The BCM monitors the ignition switch position, battery voltage and passenger
compartment door status to determine whether RAP power mode should be enabled.
If the ignition switch transitions from ON to OFF, the battery voltage
is within the acceptable range and the passenger compartment doors are
closed, the BCM enables RAP power mode. After the 10 minutes has
elapsed, the BCM will cease to produce the RAP power mode.
ACC Relay
The ACC relay switches the accessory power to the vehicle and also severs as
the RAP relay when the BCM commands a RAP powermode. The ACC relay is installed directly
on the BCM and its supply current is derived from the Fuse Block-Underhood junction
box. The BCM on this vehicle is integrated with a Bused Electrical Center (BEC), because
the BCM and the BEC are integrated, replacement of the BCM may be the only way to
repair certain RAP malfunctions. e. g. internal short to B+ or Ground.
