Retained Accessory Power (RAP) Power Mode
Retained accessory power (RAP) is a power mode that permits the operation of
selected customer convenience items for approximately 10 minutes after the
ignition switch is turned OFF. RAP power mode is enabled by the body control module
(BCM) and controls certain BCM features.
The BCM monitors the ignition switch position, battery voltage and passenger
compartment door status to determine whether RAP power mode should enable. 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 have elapsed, the BCM will cease to produce the RAP power
mode.
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 power windows, internal to BCM--if equipped |
RAP is disabled when:
• | The BCM detects low battery voltage. |
• | The transition of ignition switch from OFF to ON or ACC. |
• | 10 minutes have elapsed after the ignition was turned OFF. |
Important: There may be some functions of the vehicle
that are hard-wired straight to the battery; these are the exceptions.
ACC Relay
The accessory (ACC) relay switches the accessory power to the vehicle and also
severs as the retained accessory power (RAP) relay when the body control module (BCM)
commands a RAP power mode. 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 bussed 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.