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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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