talktome2009

Hello

I recentely noticed the passenger side mirror heating is not working. I am able to adjust the mirror from inside, but the heat function is not working. Is there a fuse that i can check or the heating element needs to be replaced. I hooked the veh to the star diagnostics, but didnt find anything.
Help!!

yulc320

I have the exact same problem on a 2005 C320...

All fuses are ok,
Continuity of the mirror heater is ok,
Continuity of the mirror heater wires ok,
Power supply to the door module is ok...
No power out to the mirror heater connector, so I suspect the door module to be faulty...

I purchased a used "door module" to see if this fixes the problem.

Will post results soon.

RWDlifer

My passenger mirror heater doesn't work either, all other door/mirror functions are ok incl reverse tilt....it's too warm now to troubleshoot, the mirror heater is controlled automatically depending on outside temps. I'll probably replace it before the next winter season, coz I doubt it's the door module. The pass. side mirror is not auto dimming and can be had brand new for under $100 (oem)

talktome2009

Do you know which fuse should i check for passenger side mirror heater? Dos the driver side and passenger side have separate fuses for heating?

lkfoster

My mirror heaters seem to be inconsistent, but I figure that it's energy management trying to level the load on the electrical system during cold starts.

RWDlifer

Both mirror heaters are on the same fuse...if one side works, then it's not the fuse. The fuse is 21 or 22 iirc located on the dash fuse box.

talktome2009

Thanks. We had a snow day couple days ago and I noticed, the passenger sider mirror is heating, but it is taking a really long time, compared to the driver side. Is it designed that way?