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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 618 (Body Rear End) >> Diagnostic Information and Procedures >> DTC B3896 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.

The rear compartment occupant sensor is connected to battery voltage and ground at all times. When a combination of a difference in temperature compared to ambient and movement is detected by the sensor and the ignition is off, the BCM will command the horn to chirp and command the trunk to release within 3 minutes of a detect signal from the sensor. If the ignition is in the on position when the BCM receives the detect signal, the disable switch on the rear compartment occupant sensor will flash.

The rear compartment occupant sensor can be disabled by pressing the disable switch on the sensor and holding for 2 seconds. The BCM will command the trunk ajar telltale on for 1 minute with each ignition on signal while the sensor is disabled. Once the trunk is opened the sensor will reset to on and resume normal operation. The sensor can also be enabled inside of the trunk with the ignition on or off by pressing the disable switch. The trunk ajar switch signal circuit is used for rear compartment occupant sensor class 2 data.

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