QuestionThe ATC control head will not go to "recalibration/diagnostics" mode. I have tried numerous times with no success. I have followed the directions in the Mitchell manual each time. I need to know if I need to find a new ATC control or no. Don't want to throw parts at it. Thanks, DaveC
AnswerHi Dave,
I don't know exactly what procedure you are following or even what signs/symptoms the unit is showing (does the display work or is it 'dark', do any of the controls work, if so which?).
Just in case you don't have the procedure correctly here it is:
The engine has to be running and the car not in motion to do the test. Simultaneously press the floor, mix, and defrost buttons, (the lower 4th button, the upper 5th and the upper 6th) and see if the display unit begins to blink. Release the buttons when it has started to do that and then after it blinks for a while longer watch for two digit numbers to appear on the readout. Those are the fault codes. If the first number appears and stays in place, push on the upper 4th buttton (panel) to continue the readout. Do that until no more codes come out. At the end of the readout the unit will return to normal settings.
Then write back with the number(s) and also tell me more about exactly what is wrong with the function of the unit.*
If the head unit doesn't respond at all, then check fuse #6 under the dash. There is also a 12V supply line to the control that is directly connected to the battery on a black/pink wire on the green plug on the rear of the control unit that should be checked to verify that you are getting that power to the control unit.
I would do a thorough readout before buying a new control unit. It may be a part in the air distribution system itself rather than the computer that is the problem. And you also might find a working used unit at a wrecking yard.
Let me know if you get any codes. Check fuses 17, 21 and 23 in the fuse box behind the left end cap of the dash.
Roland
