I have an '05 Honda Accord Hybrid, sedan. Everything is working properly with hot/cold air and A/C. However, the climate control temp lights blink every time I turn on the A/C. When this happens, auto-stop won't work. I searched the forums and found how to use the HVAC diagnosis system. I understand that I can find the codes A-N on the left side temp indicator and O-Q on the right side temp indicator. The only code it shows me is lighting up the "M" position...but on the right side temp indicator, which should be only O-Q. See attachment. Not sure why that is happening. Thoughts anyone?

Is it still the "M" code if it is on the right side? The M code diagnosis is "a problem in the mode control linkage, doors, or motor." "See pg 21-50" This must be for a service manual that I do not have. There used to be free service manuals online (I tried all the old links in other threads) but not anymore. I don't want to buy a manual, if that is even possible, for a car I'm trying to sell.

In 2023 I replaced the Motor Assembly Temperature Driver (79160-SDC-A41) because the driver side air was only blowing cold when the heat was on. That solved the cold air problem. I'm not really sure if I was having the temp display blinking problem back then or not. It has been doing the blinking thing a long time and I just haven't dealt with it since everything was working properly. Well, except no auto-stop when A/C is on and temps are blinking. But now I have to figure this out because I would like to sell the car and already had one prospective buyer ask me about it and I had no answer.

So, is it still an "M" code?
Does anyone have a service manual and can send a pdf that might address this code?
Any help or advice appreciated.
Thanks

 

I'd condsider the M position on the passenger side temp indicator as a non-existing code.

HVAC codes can be read with a scanner that can read b-codes. OBDII engine codes start wtih the letter P and have four numbers, but there are body codes for the HVAC system starting with the letter B and have four numbers. Stop by an auto parts store and have them scan for codes and/or do a system health check to get all types of codes. If their scanner can read B-codes, this could give you direction.

Just based on your description, I'd suspect a bad HVAC control module. The control module is part of the circuit board with your a/c and heat settings on the center dash.