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tomtom72 · 03-28-2012

I know that the 90's use the CDM box as a hub in serial data communication from the radio head and the A/C panel to the CCM. Yea, it's nuts, but it is true. Did someone mess with the CDM box recently?

If not check over at the Net Registry site, hit the "maintenance" tab and the "troubleshooting" or "common issues" tabs there will be a topic: "loss of serial data a/c control" or something like that. Usually shutting the car off works to re-establish the logic for the A/C control head.....not too sure about the radio head, as I've never seen that one.

Tom

http://zr1netregistry.com/ZR1_issues.htm#19
try this link. Is this what you have going on?

03-28-2012	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: HEATING A/C AND RADIO QUIT WORKING I know that the 90's use the CDM box as a hub in serial data communication from the radio head and the A/C panel to the CCM. Yea, it's nuts, but it is true. Did someone mess with the CDM box recently? If not check over at the Net Registry site, hit the "maintenance" tab and the "troubleshooting" or "common issues" tabs there will be a topic: "loss of serial data a/c control" or something like that. Usually shutting the car off works to re-establish the logic for the A/C control head.....not too sure about the radio head, as I've never seen that one. Tom http://zr1netregistry.com/ZR1_issues.htm#19 try this link. Is this what you have going on? __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 03-28-2012 at 04:18 PM.