Serial Data Control of Retained Accessory Power (RAP)
Retained accessory power (RAP) is a vehicle power mode that permits the operation
of selected customer convenience items after the ignition switch is turned OFF. These
selected items will remain in operation until a passenger compartment door is opened
or until the RAP function timer reaches its shut-off limit.
The class 2 RAP power mode is mapped to GMLAN serial data circuit as
Off power mode. Refer to
Data Link Communications Description and Operation
for more information on data link communications. The body
control module (BCM) monitors the ignition mode signal from the ignition
mode switch, battery condition and the doors status to determine whether RAP should
be initiated. The modules that support the RAP power mode will operate the systems
under their control as required by their RAP power mode strategy.
RAP will end when one of the following conditions is met:
| • | The BCM detects the opening of a passenger compartment door. |
| • | The battery capacity decreases below a prescribed limit. |
| • | Any other ignition switch state is chosen. |
The functions supported in the RAP power mode are:
| • | The IPC and DIC displays |
| • | The entertainment devices |
