Trunk/Liftgate Ajar Indicator Description and Operation
Door Ajar Indicator
The body control module (BCM) monitors the voltage level of the liftgate ajar signal circuit which is normally at the system voltage
when the liftgate or trunk lid is closed. When the liftgate or trunk lid is ajar or open, a switch within the latch assembly closes
providing a path to ground for the liftgate ajar signal circuit. The voltage within the signal circuit will then drop to 0 volts, the BCM
will then detect the voltage drop and will send a serial data message to the instrument panel cluster (IPC). The IPC will then display
the door ajar icon.
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Vehicle Access
BODY SYSTEMS
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CHEVROLET SONIC 2012 BODY REPAIR MANUAL