Rolf Persson
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
My guess is there are uarts in the C68 control unit and the Programmer under the dash.
There is a dedicated serial link between these two units.
Probably, something has failed for this link.
Tom Piper
There is a dedicated serial link between these two units.
Probably, something has failed for this link.
Tom Piper
Thread Starter
Heel & Toe
Joined: Nov 2006
Posts: 17
Likes: 0
Heater and a/c programer
thanks for the inf maby someone can tell me if that could have any thing to do whit a battry drain i am trying to find it is true the curtesy fuse and i have disconet everything i can thing of and it stops when i disconecting programer have disconetet radiocomponents, light, ecm,ccm a/c controller i dont now if there is somthing i need to check before i change the programer somthings i need to thing about and if there is any good repiaer shop thath i can send the electronic componetes for checks and repears
Thread Starter
Heel & Toe
Joined: Nov 2006
Posts: 17
Likes: 0
Thanks for the info mabye someone can tell me if that could have any thing to do with the battery drain i am trying to find.... it is through the courtesy light\fuse and i have disconnected everything i can think of ....and it stops when i disconnect AC and heater programer, have disconnected radiocomponents, light, ecm,ccm a/c controller. I don't know if there is something i need to check before i change the programmer ....something i need to thing about and if there is any good repair shop that i can send the electronic components for checks and repairs. I am located in Sweden. Appreciate your help and reply.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
All i can offer is some info on the C68 climate control.
http://members.shaw.ca/dankai/AC%20Electronic.pdf
http://members.shaw.ca/dankai/AC%20Electronic.pdf
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
Right on! UART, Universal Asyncronous Receiver Transmitter. If it's marked with the generic part number, you could probably get one for pennies and replace the one (which one?) that's bad. Problem is, that kind of info is almost impossible to get and GM's supplier never intended it to be repaired. I'm suprised it even told you that level of detail. Essentially what it means is you have the choice of replacing the whole unit or doing without but you can feel comforted in the fact that you know why! You might want to search for the posts concerning reversion of the C68 auto control to C60 manual control! When I finally get "my" '89, I'll likely have a complete C68 system for sale 'cause it's one of the things on my "hit" list. Good luck!
