Information Bus: 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).