⌛ The basics of Heated Mirrors

[RobbiZ4]

Well guys, it's a bit more complicated as always with our cars.

There exist 2 different mirror solutions:

• Heated and anti glare LIN bus foldable mirrors
• Heated Non-LIN bus mirrors

Ugh, what is a LIN bus? Well, that's a single wire data bus to transmit data frames from one modul to another. The sender is the footwell module FRM3, the receiver is an electronic modul placed INTO the mirror housing.

Both types of mirror heaters are supported by the junction box electronics and operate depending on the vehicle's front temperature sensor. There is no way to manually heat the mirrors. This is JBE magic!

• LIN bus mirrors are connected to the FRM3 by a 6-pole plug in the window triangle, which only keeps 3 wires: +12V, GND, LIN.
• NON-LIN bus mirrors are connected to the FRM3 as well as to the JBE by the same 6-pole plug in the window triangle, which keeps 5 wires(!).

The installed mirror version can be checked by pulling off the mirror triangle with the tiny speaker on the inner side of the doors, unplug the 6-pole connector and count the number of pins comming in from the mirror! Quite simple, no tool is required.



Last autumn I had a problem with foggy mirror glasses in a chain of several 3km tunnels in the north of Italy. No way to get the mirror heating to do their job, I had paid for! That was the initial kickup for another project of mine:
SHiIT: Mirror (German: Spiegel) Heating in Italian Tunnels.

SHiIT has been successfully finished some days ago with some interesting findings on the mirror heatings.

Just have a look:
In German: https://www.zroadster.com/forum/thr...nneln-shiit-erfolgreich-abgeschlossen.149170/
or Translated by Google

 

[AnubisZed]

Can I just check something Robbi, did you mean the JBE, because when I retrofitted my Powerfold mirrors, the Linbus was wired to the FRM, as per the wiring diagram from newtis.

 

[RobbiZ4]

Thanks for your hint.

I've updated my post:

• LIN mirrors are directly connected to the FRM3 with their LIN bus wire
• NON LIN mirrors are connected to the JBE for the mirror heating, to the FRM3 for the mirror motors.