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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC B3031: No Valid Key Pellet Resistance In Memory >> Circuit Description

Circuit Description

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

When an ignition key is inserted in the ignition switch, the terminals located in the ignition lock cylinder contact the resistor pellet in the key. The body control module (BCM) measures the resistance of the key pellet and then compares the resistance to the one stored in memory. If the BCM has been replaced, the new BCM needs to learn the ignition key code value. The BCM learns the first key code value when the ignition is first turned to ON.

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