Circuit/System Description

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) controls the ignition main, ignition run, and retained accessory power relay1 by applying voltage to their individual relay control circuits. The ignition main relay is energized when the ignition switch is in the ON or the CRANK position. The ignition run relay is energized when the ignition switch is in the ACCESSORY or the ON position. The retained accessory power relay 1 is energized during all power modes, except OFF-awake and CRANK. The relays are also energized for approximately 10 min after shutting the ignition OFF and removing the key, providing no door is opened.

The BCM also controls the battery saver relay through individual circuits by applying voltage to the battery saver set and reset circuits. The battery saver relay is a latching relay that when enabled disconnects some modules from their ignition power or memory power sources.

The keyless entry control module controls the retained accessory power relay 2 through the control circuit by applying voltage to the interruptible retained accessory power relay coil control circuit. The retained accessory power relay 2 is energized when the ignition is in the ACCESSORY or the ON position. The relay is also energized for approximately 10 min after shutting the ignition OFF, providing no door is opened

The engine control module (ECM) controls the engine controls the ignition relay by applying voltage to the engine controls relay control circuit.