[fdryer]

Cavell, some info to consider; a)the engine control module (ECM) runs the EFI system, b)body control module (BCM) runs almost everything else except airbags and abs, acts as gateway communications for OBD II, c)abs/tc has its own control module to self diagnose abs issues, turns on the abs light for errors, and run the abs operation to help with braking, d)airbag system has its own sensing and diagnostic module to self test the airbags, monitor the airbags during ignition on time, turn on the airbag light if system problems are detected and store error codes.