93 Deville climate control
 

Hi all !

I have a 93 Deville with 88k miles. The problem started acouple of days ago. The dispay for the ac/climate control and fuel gauge/fuel data center shows a lower case "d" , the blower stays on withot the compressor kicking in, can't use any of the buttons and when the ignition is turned off everything goes off.....normally everythig stays on until you open the door. The "service engine soon" , "service vehicle soon" and "service A/C soon" lights stay on. A few occasions everything at once changed back to normal while driving .....service lights went out, climate control /fuel data back to normal and compressor came on. I've checked fuses and maxi fuses and took it to the dealership. Any ideas ?

RE: 93 Deville climate control
 

dont have such a manual, but i seen many on the front of the inner fender or
by the headlight - compressor side.


maybe that will help some?

keep us posted.

RE: 93 Deville climate control
 

Problem solved.....PCM bad

RE: 93 Deville climate control
 

FINALLY I HAVE A ANSWER!!!! MY 93 D IS DOING THE SAME THING EXCEPT MY CLIMATE CONTROL SECTION HAS A SMALL ..c... not ..d..... YOU SAID YOU CHANGED THE PCM???OR BCM ??? PLEASE HELP..THANK YOU!!!

RE: 93 Deville climate control
 

ANYBODY KNOW WHERE THE PCM IS ON A 93 DEVILLE???? THANKS TONY!!!!

RE: 93 Deville climate control
 

Me best recollection is under the instrument panel on the passenger side If you are a do it yourselfer you should invest in a FSM. They can be found on e-bay pretty cheap.

RE: 93 Deville climate control
 

HEY GUY..WHATS A FSM???????????? THANKS.

RE: 93 Deville climate control
 

service manual

RE: 93 Deville climate control
 

THANKS..G.A.R.Y. I HAVE LOOKED AT ALL THE SERVICE DIAGRAMS FOR THIS 93 AND ALL I COULD FIND IS EVERYTHING BUT??? THE PCM?? HELP!! THANKS.

RE: 93 Deville climate control
 

Hey TV: When you say all the service manuals do you mean Chilton or Haynes manuals?? Best go to www.autorepairmanuals.biz and order up one of the original dealer service manuals and you will have all the original factory specs and the schematics for your ride. Good luck.

RE: 93 Deville climate control
 

Check all your ground connectionsunder the vehicle because it seems like you have power going to systems because it does on and off intermediately and it seems to be a ground curcuit problem if anything. and check them all there are a lot of them everywhere. be careful and to use a digital volt meter. do not give up cause you will find it[sm=drlove.gif]

RE: 93 Deville climate control
 

This thread discusses a bad PCM as the root problem ... will that also cause other "electrical gremlins" to surface?

I also have a 93 DeVille showing a "c" in the CCC. Just started last week, the a/c turns on even when it is switched off. Also, when I start the car, the a/c usually comes on, temp set at 75, and then a few minutes it will go blank and show the "c".

Will the PCM also cause the Fuel Data Center to not display? It comes and goes, but usually will not reset, just not display.

Any help would be appreciated.

RE: 93 Deville climate control
 

c is for clock which bcm has more control of. Are codes set?

RE: 93 Deville climate control
 

I cannot get the codes to come up. Unless I am trying to access them incorrectly (hold off and warm at the same time), it will not enter the diagnostic mode. Any suggestions?

RE: 93 Deville climate control
 

What happens when off and warmer are pressed? Do all the buttons on a/c panel work?

RE: 93 Deville climate control
 

Actually the buttonsdo not workmost of the time since this issue started. Sometimes when I start the car, the CCC works, then will revert to the mode where the "c" appears. Other times when I start the car, the "c" is there and the CCC doesn't respond to any buttons pressed.

RE: 93 Deville climate control
 

Got codes to come up. I am getting
E47 E85 F30 F31 F40

I cannot determine what the F codes are. Any suggestions?

RE: 93 Deville climate control
 

E47 - BCM-PCM DATA PROBLEM
E85 - THROTTLE BODY NEEDS CLEANED
F30 - CCP-BCM DATA PROBLEM
F31 - FDC-BCM DATA PROBLEM
F40 - AIR MIX DOOR PROBLEM

This condition is not an easy fix if you don't have FSM or parts car to raid parts from. You could try to unplug different components when condition occurs, a see if corrects itself indicating bad part.

I suggest to disconnect and re-connect if no change:

1) a/c programmer
2) FDC - fuel data panel
3) CCP - a/c control head
4) PCM / ECM
If disconnecting the different parts make no change BCM is the likely cause. If you have or can get access to a FSM follow diagnostic charts.