Sierra 1500 4WD V8-5.3L VIN Z Flex Fuel (2005)
Steps 20-27
The numbers below refer to the step numbers on the diagnostic table.
2. A partial malfunction in the class 2 serial data circuit uses a different procedure from a total malfunction of the class 2 serial data circuit. The
following modules communicate on the class 2 serial data circuit:
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The audio amplifier (AMP), w/UQ7 and Y91
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The body control module (BCM)
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The communication interface module (OnStar(R)), w/UE1
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The digital radio receiver (DRR), w/U2K
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The driver door module (DDM)
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The electronic brake control module (EBCM)
