96 e300d how to clear the DTCs
 

Does anybody no how to clear the DTCs in the push button control unit. Thanks for any help

hope this helps...

to read the PBU's error codes follow the procedure,
Key on with enginer off
Set temperature to LO
Press REST and "Defrost" buttons at a time for over 2 seconds (must be done in 20 seconds from last step"

If you see the LED on recirc button is flashing at 1Hz freq and screen shows "diR" you are in error code retrieving mode.

Press AUTO to read a contineous error codes at a time

Continue press AUTO and write all codes in your note until screen shows End

Now press AUTO again to read the intermittent codes.
Same procedure as contineous code reading above until screen shows End.

Make sure you log all the codes in your note. Let's see what you get.

Now the procedure to clear these codes,

Press '^' and 'V' at a time the screens shows "---". Codes being cleared.

The last step is somewhat different from what I experienced in my car. Manual says press ^ and V again to exit but I never success. So I simply turn key off, then start engine again. Turn AC on to see if you get cool air back. You can also check 22 to see if the compressor is running.

http://www.peachparts.com/shopforum/showthread.php?t=291829

Just for the sake of responding to the same thread title....

Title fixed. Awesome. :)

Thanks to Pimpernell, I am going to try to clear the P0400 code in our 98 E300 with your above method. I am not confident that the same applies to our model year, but worth a try as I do not (yet) have a code reader of my own.

Won't work, yours is an engine code and the OP's is an AC code......will prob clear (for a while) if you disconnect the batt for 30 minutes. You'll have to re-sync all seats and windows though which can be a pain. $50 code reader is much more efficient.