I have a set of OEM Schefenacker power, heated, signal TTT mirrors and I am having a problems with my passenger side one. The problem is that when I turn on the defrost switch for the mirrors the passenger side mirror lights go out completely and it's only the passenger side because the drivers side works fine.The mirror still has power because I can still move the glass. Yesterday I took my truck to the dealer to ensure that there wasn't any problems with the truck wiring which there wasn't. I've already switched out 2 mirrors and both of them did the same. I'm waiting for my third one to arrive. Has anyone had this problem.

 

Hey Angel, did you get this fixed? I never had any issue with mine. It sounds like some type of wiring problem...I don't understand how two mirrors have the exact same problem. Just a thought, and this is a little bit of work, but you could remove the other mirror and plug it in that side to see if it's doing the same thing.

 

Sorry I dont have any help with your problem but you have a really nice *** truck and I really wanna get a set of those mirrors. They look so nice on your truck man!

 

Hey Ralph, I spent all day looking and figuring what is the difference is in the plug and realized that the mirror has two ground wires while the plug from the truck has 1. Then I sat down and realized the that drivers side works fine so I'm going to take apart both doors and compare mirrors I just received my third passenger side mirror and they all do the same because of the wiring. So I took apart the second of the three one and removed the ground wire to the signal light and decided to ground that one to the vehicle and just use the one from the truck for the heated mirror to see if it works. I'll have to wait to this weekend to do it though but ill keep you guys posted. Nuclearthreat54 Thanks for the props.

 

Well I figured out the problem and I fixed it. The drivers side and passenger side wiring harnesses are different when you look at the pictures below. The Passenger side mirror is missing the #2 and #9 wires that the drivers side wiring harness has and uses as ground wires for the drivers side mirror . So I moved the #9 pin on the mirror to the #8 slot so that it would use the #8 ground wire from the passenger side wiring harness for ground. I could have used either the #2 or #9 pin because both these wires merge into one ground wire anyways.

Drivers side wire harness


Passenger side wire harness


Schefenacker Passenger side mirror wiring

 

wow, good catch. i never would have thought the harnesses would be different for each mirror!!!...glad u got it fixed, kinda funny that ford didnt find that when u took it in. hope none of this cost u anything, if so i would have to have a lil talk with the dealer since they said the wiring was ok.....

 

Hi Labman!

Why would he have a talk with the dealer? According to the wiring schematic, the Ford wiring harness is as it should be. I'm sure the dealership service department could care less how an aftermarket mirror is wired. It looks like the Passenger mirror was looking for a ground on the wrong pin. If anything, he should have a talk with the company that made the mirrors so they can correct their mistake??????

Perhaps I am reading something wrong????

 

true, i just misread his OP. my bad!!!

 

Thanks for the clarification. Just making sure I was reading it right.

 

Thanks, and I hate to say it but it did cost me money. They charged me to look at the wiring at the dealership and then I went through the hassle of getting other mirrors exchanged thinking something was wrong with them, I guess the passenger side does have something wrong with it since it's wired the same as the drivers side. Also I called schefenacker to let them know about the problem, but the lady on the other side of the phone line just got angry with me. I tried to explain to her what was happenning and she just went ballistic and said it was Ford problem. I told her how can it be Fords problem if you manufacture the complete mirror, it's got your name written all over it. So I just told her to forget it. The same thing happened when I called the ford Customer Relations Center another lady just lost it with me and told me it was my problem because I had installed the mirror myself. She even as far as to accuse me of messing with the wiring. I told her it was a plug and play deal and I hadn't messed with any of the original wiring, that's when she started getting angry with me because I explained to her how basic it is to unplug one thing and plug another in and asked her how that involved messing with the wires. I can understand if a person doesn't comprehend what your saying, but when your just plain stupid that really ticks me off.