1992 Riviera trouble codes

[Festus]

Purchased a beautiful 1992 Riviera a few months ago (when it was cold) and just recently discovered that the AC doesn't work. Determined the relays are fine, clutch works and AC is charged-so the system works. So I ran through the trouble codes and they gave me 111H-AC temp or circuit fault highside, and 112H AC temp or circuit fault lowside (both history codes) and code 334C (current) which indicates "ECM to BCM fault-loss of communication". We also noticed the tach and temp gauage do not work. Thus we deteremined the BCM (Body Contol Module) was bad. I replaced the BCM but can't get the code 334 to clear and problems still exist. Any suggestions of what to look for now?

 

[RonLange]

well this may be a totally obvious idea, and i hope you've tried it, unhook your battery for a minute or more, and this may clear fault codes. if not, you'll have to look into the owner's manual or get a hand held code reader for your model to clear that pesky 334.