ECM/PCM Power Relay Control Circuit
 

My malfunction indicator light came on the other day, took it to the parts store and got the error code P0685. The light has been reset since I went (Sunday) and hasn't come back on yet. Should I wait for the light to come back on before I do anything? Please help :)

welcome to the forum. Yes and see if it is the same, then you know it for sure its doing a malfunction.

Thanks. It's back on again. How difficult is it to replace an ecm relay? Is this part something I can only get from a dealer?

It is not hard to replace the ecm . Go to hondaautomotiveparts.com and put your car info in. go to control unit cabin. Make sure it is the relay or ecm/pcm

I really appreciate your help, acmech. I've confirmed that it is for sure the ecm/pcm relay and I've ordered 2 of them. If you haven't figured it out, I'm no mechanic...the most I can do is change the oil and filter on my own. :) Can you tell me where the ecm/pcm relay goes? I looked at the diagram but couldn't figure it out.

Here's what I was looking at, illst #48:

http://www.hondaautomotiveparts.com/...%29+%28+05-%29

Does anyone know where ecm relay goes on a pilot?

I have this error on my 2005 Honda Pilot, P0685 ECM/PCM Power Relay -Open Circuit, Can i get help to solving this issue?