HVAC Code 4 help
 

i have DTC 4 "AN OPEN OR SHORT IN THE MODE CONTROL MOTOR CIRCUIT" it says see page 21-24. do you happen to know how to fix this or have those pages to post? thanks in advance

I moved this to a new thread.

Do you have a volt meter to take some readings?

I have a volt meter. Thanks in advance for the help.

What year/trim Accord? Place in your signature for easy access.

good luck

TX - I moved this from the end of a 7th gen thread (03-07). There is a bit of difference between the 2 and 4 door models.

i just updated my signature. i have the 4 door.

There are tests to run. Also be sure, if you go thru everything and are down to replacing the motor - be sure the linkage is not binding.

I have an 05 Accord and the vents will not physically switch to defrost, floor, or floor/vent although the LED controls will show it switched.

The diagnostic presented the same DTC Code 4 "An open or short in the mode control circuit" mentioned above.

I am not familiar with using a volt meter and currently don't have access to one to test all the connections. Would it be a safe bet to order a new mode control motor? If so, can someone pass along the part #?

Thanks in advance.

2005 Honda Accord EX Sedan
4cyl with sunroof

The motor is different between the 4-door and 2-door. Which one do you own?

It is a 4 door.

How to unbind mechanism?
 

I was able to get to the control panel and found out the mechanism gets bound up when it switches to the normal dash vent only. This causes the mechanism to go to the lowest position and get stuck there.

Once in dash only setting it is stuck. Once I force it away from that position it will move freely to the floor, defrost, and floor & dash settings using the controls.

Any suggestions on how to prevent it from binding?

Thanks in advance.

I had a 5th gen that would "bind" up like that. I would lube the linkage with some white lithium grease.

I think on your car the motor will need to be removed to get at the linkage.

Took the motor out and everything seemed greased up and I put some more on to make sure it was good to go.

Moving the levers manually it does seem difficult to change from the top vent setting. It isn't stuck and operates smoothly it is just a bit heavier that I imagines for that small motor.

Does anyone know the part number for that motor? I will give that a shot.

Thanks.

Please double check me on this - 79140-SDA-A01.

A bone yard might be a choice to think about if you don't want to go with a new one :shrug: