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Home >> GMC >> 2002 >> Sierra 2500, 2D Pickup, LQ4, Standard >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control System >> Description & Operation >> Body Control System Description & Operation >> Fail-Safe Operation
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Fail-Safe Operation

Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the BCM fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.