Volt

Retained Accessory Power Description and Operation

The body control module (BCM) monitors the vehicle power modes, 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 vehicle power mode is any state other than Vehicle OFF regardless of the door switch signals.

The BCM keeps the relay energised during all power modes, except Vehicle Off. The relay is also energised for approximately 10 minutes after moving to the Vehicle OFF state and moving the transmitter out of range, providing no door is opened.

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

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

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.