Same thing as CCRM. I think. Try this link it might help.
http://members.bellatlantic.net/~rbruce/ccrm.htm
Also provided thanks to
projectSHO89
IRCM/CCRM Functions/Pin-outs
The IRCM/CCRM performs four functions on the SHO:
1) EEC Power Switching
2) Fuel Pump Relay Switching
3) Cooling Fan Power Control
4) A/C Clutch Control
All years, all versions:
Pin 15 is ground.
Pin 16 (A/C Coil low side) is connected to pin 15 internally.
Pin 8 is ALWAYS HOT.
Pin 13 is HOT in RUN/START.
1. EEC Power Switching: When the ignition switch is turned to START/RUN, switched power is applied to the high side of the EEC POWER RELAY coil (low side is grounded). The COMMON terminal of the AC POWER RELAY is connected to pin 8. The output of the EEC POWER RELAY is supplied to the high side of the fuel pump, fan, and AC clutch coils and is distributed out pin 24 as SWITCHED B+ to the PCM and to various sensors and actuators on the engine when this relay is energized.
2. A/C Clutch Control: There are two inputs to the A/C clutch circuit and one output:
A) A/C Request signal (Pin 21). This is a switched HIGH (battery voltage) signal that is true when the EATC/HVAC control and the cycling switch have requested compressor clutch operation.
B) WAC* (WOT A/C Cutout - Pin 22). This is an active LOW (ground) signal from the PCM that is enabled when the PCM has determined that compressor operation must be disabled, i.e., under heavy acceleration.
C) A/C Clutch Coil (Pin 23). This is an active HIGH (battery voltage) signal that is true only when Pin 21 is high and pin 22 is not LOW.
Variations by Type
Fuel Pump Control
All versions provide output on Pin 5.
Type M:
(89-93 MTX) IRCM boxes contain two fuel pump relays. 89 and 90 used an external dropping resistor in the supply line for the LOW SPEED FP RELAY common (Pin 10). 91 and 92 MY vehicles have a jumper that applies full B+ to the supply of the LOW SPEED FP RELAY. All years supply B+ to the HIGH SPEED FP RELAY common via pin 12. The NO contacts of both relays are tied together internally in the box and is output on pin 5. The LOW SPEED FP RELAY is energized by the PCM by applying a ground to Pin 18 (Note: The FP TEST pin on the DLC is connected to this pin). The HIGH SPEED FP RELAY is energized by the PCM by applying a ground to pin 11.
Types D and J:
(93-95 ATX, 94-95 MTX) CCRM has a single FP RELAY. B+ power is supplied to the common terminal via pin 12. The FP RELAY is energized by the PCM (or grounding the FP TEST pin on the DLC) by grounding pin 18.
Cooling Fan
Type M:
(89-93 MTX) Single speed. Input fan power is supplied to pins 1 & 2. A single fan relay is energized by applying an active ground to pin 14. Output switched power is output on pins 3 & 4 to the electric fan.
Type D:
(94-95 MTX) Dual speed cooling fan (dual coil). Input fan power is supplied to pins 3 & 4. LOW SPEED FAN RELAY is energized by a ground on pin 14 and switches power to pins 1 & 2 which is routed to the low speed fan winding. HIGH SPEED FAN RELAY is energized by a ground on pin 17 and switches power to pins 6 & 7 which is routed to the high speed fan winding. Due to an internal switching diode, application of a low on pin 17 will result in BOTH fan relays being energized.
Type J:
(93-95 ATX) Dual fans in parallel with an external low speed dropping resistor. Input power via resistor is applied to pins 1 & 2 to the common terminal of the LOW SPEED FAN RELAY. The relay is energized by applying a ground to pin 14. Switched power is output on pins 3 & 4. Full battery power is input via pins 6 & 7 to the HIGH SPEED FAN RELAY common terminal. The relay is energized by grounding pin 17. Switched power is output on pins 3 & 4.
