The wires that control the radio from the steering go to the Body Control Module (BCM), not directly to the radio. The BCM sends data over the serial bus to the radio.
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The digital radio receiver (DRR)
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The electronic brake control module (EBCM)
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The inflatable restraint sensing and diagnostic module (SDM)
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The powertrain control module (PCM)
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The radio
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The vehicle theft deterrent (VTD)
The class 2 serial data link also allows a scan tool to communicate with the above modules for diagnostic and testing purposes.
The class 2 serial data link on this vehicle is configured in a star pattern. There is no redundant path for the serial data to flow through. If a class 2 serial data circuit develops an open condition, the module connected by that circuit will not be able to communicate.
If not hooked up right the vehicle may not even start .
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