mk2 wiring diagram
 

As the title really, I need a wiring diagram for the mk2 heated rear window switch.

I've got a switch to use for my heated windscreen when it turns up, and just need to know which terminals on the switch do what.

Thanks:smile1:

My god, one to put in the calendar people, Pete needs our help! :laugh:

I take it the mk1 is too dissimilar then?

I think its a momentary contact rather than a switch, so you would need a little switching circuit behind it.#

Is it not easier to wire up a relay on the wires that go from the BCU to the rear heated screen?

I had considered linking in to the hrw wires from the bcu to switch a relay, I'm just a bit concerned about how temperamental the bcu can be.

The switch would have to be used with a latching relay because as you say it is a momentary switch, so press it once to latch the relay, and again to unlatch.

Momentary Switch for sure.

4 wires, Black, Red/Black, Yellow/White and Yellow/Blue

Black - Common
Yellow/White is Normally Open
Yellow/Blue is a +ve voltage for Tell-Tale light
Red/Black is +ve voltage for the light

Hope this helps?

Cheers Smokey that's a big help, it confirms that the mk1 wiring diagram is the same as the mk 2 for the heated rear window, ideally I want to make the front screen work with the rear so that they're both on a timed cycle.

So only having one switch? Surely that would be the easiest way to go?

Yes, just the rear screen switch, and use the +ve feed to the hrw element to switch a relay for the front screen, Then just source a live feed for the front screen element, the easiest way to do that is by using one of the spare connections on the fuse box in the cabin

Sounds like a plan. Shame you are getting the screen just as the warm weather is appearing. Will be an awesome mod come the frosty mornings though!

lol yeah tell me about it, the plan was for them to be ready last year, but it took forever to get enough people for the group buy.