Information Bus: Description and Operation
OPERATIONVarious modules exchange information through a communications port called the CCD bus. The PCM transmits the Malfunction Indicator (Check Engine) Lamp On/Off signal and engine rpm on the CCD Bus. The PCM receives the air conditioning select input, transaxle gear position input and speed control engage inputs over the CCD Bus. The PCM also receives the air conditioning evaporator temperature signal from the CCD Bus.
The following components access or send information on the CCD Bus:
- Instrument panel
- Body Control Module
- Air Bag System Diagnostic Module
- Full ATC Display Head
- ABS Module
- Transmission Control Module
- Powertrain Control Module
- Overhead Travel Module