Body Control Module: Description and Operation

DATA LINK COMMUNICATIONS DESCRIPTION AND OPERATION

The scan tool accesses the following data lines:
- The brake pressure control valve (BPMV)-On vehicles with antilock brake systems.
- The powertrain control module (PCM)
- The inflatable restraint sensing and diagnostic control module (SDM)
- The radio.

The BLU/RED wire at cavity 7 of the data link connector (DLC) provides access to the BPMV, SDM, and to the PCM and the radio. The RED/BLK wire at cavity 16 provides voltage to the scan tool. The WHT/BLK wire at cavity 4 and the BRN/RED wire at cavity 5 provides ground to the scan tool.

The data lines monitor the module for diagnostic purposes and for diagnostic trouble codes (DTCs).