Chevrolet Sonic Repair Manual: Retained Accessory Power Description and Operation

Retained Accessory Power

RAP Description and Operation Block Diagram

K9Body Control ModuleK73Telematics Communication Interface Control ModuleA11RadioKR76Retained Accessory Power Relay

Hard-Wired

Serial Data

K9?€‰Body Control Module

K73?€‰Telematics Communication Interface Control Module

A11?€‰Radio

KR76?€‰Retained Accessory Power Relay

The body control module (BCM) monitors the ignition switch position, battery condition, and each door ajar/open switch status to determine whether the retained accessory power should be initiated or terminated. Retained accessory power is controlled by two different methods; relay control and serial data. Some modules receive a retained accessory power message from the BCM over the serial data circuits. Serial data controlled retained accessory power is deactivated as required by their modules retained accessory power mode operation. Other subsystems are activated directly by the BCM through a relay. Components and systems that are active in retained accessory power are also activated anytime the ignition is any position other than OFF regardless of the door switch signals.

Relay Controlled Retained Accessory Power

The BCM keeps the relay energized during all power modes, except Off-Awake and Crank. The relay is also energized for approximately 10 minutes after shutting the ignition OFF and removing the key, providing no door is opened.

Relay controlled retained accessory power will end when one of the following conditions is met:

• The BCM receives an input from any door ajar or open switch indicating the opening of any door after the ignition key is out of the ignition.

Note:

If the BCM is receiving any door ajar or open signal from those switches when the ignition key is turned OFF, retained accessory power will not initiate.

• The BCM internal timer for the retained accessory power expires after approximately 10 minutes.
• The BCM detects a decrease in battery capacity below a prescribed limit.

Systems powered by the retained accessory power relay during the retained accessory power mode are as follows:

Note:

The vehicle may not be equipped with all components as listed below.

• Accessory Power Receptacle
• Cigarette Lighter Receptacle
• Window Switches
• Sunroof Control Module
• Sunroof Switch
• Mobile Device Wireless Charger Module
• Mobile Telephone Control Module
• Traffic Data Receiver
• Transmission Shift Lever Position Indicator (w/floor mounted console gear shift)
• Seat Heating Control Module

Serial Data Controlled Retained Accessory Power

Retained accessory power systems controlled by serial data are as follows:

Radio

Radio retained accessory power activation / termination is the same as relay operation with one exception; the only door switch that will turn off the radio during retained accessory power is the driver door open switch.

Vehicle Communication Interface Module (VCIM) (Onstar?®) (If Equipped)

VCIM RAP activation/termination is the same as radio operation with 1 exception; if there is an active call when the ignition key is turned off the VCIM will remain in RAP mode, and keep the radio in RAP mode until the call is terminated.