i have external mirrors heating in car but i cant or dont know turn it on. in manual i cant find anything..

somewhere i read that rear window heating must be turned on, and switch on drivers door turned on position heat, (see the picture)

rear heater it works ok, glass is getting hot but mirrors not.

did i something wrong or maybe is there some relay or some fuse is gone, did someone know? i am sure that is the same on all skodas and vw..

 

had to be related with this error..

 

1 Fault Found:
00470 - Company Comfort Databus in Single Wire 
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 3
                    Fault Frequency: 56
                    Reset counter: 57
                    Mileage: 189401 km
                    Time Indication: 0
                    Date: 2013.01.31
                    Time: 19:15:07
 

 

The door and rear window heating are separately controlled. Also, IIRC they both automatically turn off after a certain amount of time. 

Your photo shows the heated mirrors in the off position BTW.

I've already explained that error to you. It's to warn that one of the two comfort CAN-bus wires has a fault, this may cause performance issues on the CAN-bus but shouldn't cause any functional difference unless you also get fault codes about missing messages.

 

As JohnBoy mentioned, the switch is in the 'off' position, have you rotated it to the 'heat' position?

Are there any output tests you can try in the door mirrors?

Have you checked the resistance of each door mirror heating element as they can degrade and fail?

How are you testing to see if they are on?

What's the outside temperature? It needs to be cold enough before they'll turn on.

 

They should be connected directly to the door controllers so I don't think there are any other fuses/relays involved.

54 minutes ago, john999boy said:

The door and rear window heating are separately controlled. Also, IIRC they both automatically turn off after a certain amount of time. 

Your photo shows the heated mirrors in the off position BTW.

 

Good Morning John.

Sorry to say but the door mirror heaters are manual control only! They DO NOT turn off after a preset time as you had thought. It's been a topic on here before when people have suddenly found that the heater matrix behind (bonded to) the mirrors have failed as they have been left on. Lots of suggestions of how they could / should have been configured but that's the way they have been on the Yeti & others since they were introduced.........Tony

8 minutes ago, Great Yeti said:

Good Morning John.

Sorry to say but the door mirror heaters are manual control only! They DO NOT turn off after a preset time as you had thought.

I stand corrected. 

The rear window does though. 

how do i know which is canbus wire? some colour? is it thinner wire or wider diameter?

 

if i turn button on side with heater icon, nothing happens..

it is maybe by influence with outer temperature, it is autumn here like in england, no cold time yet, and no need mirrors to be heated yet..

i am wondering if them working only if outer temperature falls under...... some celisus..?

Edited 22 September, 20187 yr by imart143

CAN-bus should always be a pair of thin wires twisted together.

 

Not sure what colour they'll be. I'd suggest you use erwin to find the wiring diagrams as the comfort CAN-bus will connect to quite a few modules...

hmmm i foung something:

 

It is fixed by finding the break in the CAN-Bus wiring. CAN-Bus wiring is made up of a twisted pair of wires to improve noise immunity. Your CAN-Bus is operating in a degraded state as one wire is broken. You need to look at the orange/green, orange/brown twisted pair.