Circuit/System Description

WARNING: This page is about a different car, the 2017 GMC Acadia. 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 relay by applying voltage to its individual relay control circuit. The ignition main relay is energized when the ignition is in the ON or the CRANK position. T

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 relays through their control circuit by applying voltage to the interruptible retained accessory power relay coil control circuit. The retained accessory power relays are energized when the ignition is in the ACCESSORY or the ON position. The relays are also energized for approximately 10 min after shutting the Ignition OFF/Vehicle 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.