That’s a JC5 CPU, did you get this as a replacement for an older board? You need 675HE16 generic software for this board. Maybe why you can’t talk to it, does the LED flash slow? The trick to doing this upgrade is to fire up the board for the first time with a blank U22 EEPROM, after you get a slow flash turn it off and replace the U22 with the original adjusted one. Then the car should just run. The reason is the first power up initialized the U22 and you will have to adjust from scratch.
