tcurtsinger

Cant seem to find a thread with a solution to my problems. The climate control acts funny, no air to floors, randomly stops and restarts on high. If I turn it off it will come back on. I cannot get diagnostic codes, when i enter the diagnostic mode I get the blank screen, but when I push the auto button to get the first code the unit starts flashing rapidly and wont stop, also has a corresponding clicking coming from under the passengers dash. It has done this once before while I was driving but stopped when I turned the car off and was fine when I restarted it. I am assuming the control unit is bad? Any suggestions?

Plutoe

You know doubt have checked this, but is the battery voltage at least 11 volts.

RobertG

My wife's e320 had the similar problem and it was loose connection on the back side of the control panel

tcurtsinger

It will let me do the input monitoring and the voltage is around 11.5. I took the unit out and checked the connection and everything seemed tight and corrosion free. Still wont let me enter diagnostic mode to retrieve trouble codes? I have a place nearby that parts out Mercedes, I need a new trunk release so I'm thinking of pricing a new control unit to see if that fixes the problems, seems like there is a short somewhere?

tcurtsinger

There is an aftermarket cd player installed, I'll try pulling it out too and checking the wiring a little further.