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Class 2 Serial Data Line

The class 2 serial data line is a Purple wire connected between Data Link Connector (DLC) terminal No. 2 and the following modules.

Body Control Module (BCM)
Electronic Brake Control Module (EBCM)
Instrument Panel Cluster (IPC)
Powertrain Control Module (PCM)
Inflatable Restraint Sensing And Diagnostic Module (SDM)
Radio

The class 2 serial data line allows these modules to communicate with each other and with the scan tool for diagnostic and testing purposes.