IRCM= Integrated Relay Control Module
CCRM= Constant Control Relay Module
They are basically the same thing. The module consists of 4
relays that work in conjunction with the PCM to make things
work.
1. Relay for the PCM
2. Relay for the high and low radiator fan speeds
3. Relay for the fuel pump
4. Rely for the Air Conditioning clutch on the compressor