Circuit/System Description

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

NOTE:

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

The body control module (BCM) controls the ignition main, exhaust flow control valve, and trailer ignition power relays by applying voltage to their individual relay control circuits. The ignition main and exhaust flow control valve relays are energized when the ignition is in the ON or the CRANK position. The trailer ignition power relay is energized when the ignition switch is in the ACCESSORY or the ON position.

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

The keyless entry control module controls the retained accessory power relay by applying voltage to the relay coil control circuit. The retained accessory power relay is energized during all power modes, except OFF-awake, CRANK and during transmitter authentication. The keyless entry control module will deactivate components that may cause radio frequency (RF) interference when the ignition mode switch is pressed which may result in NO REMOTE DETECTED displayed on the driver information center. 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 ignition relay by applying voltage to the engine controls relay control circuit.