Rear Windows & Side Mirrors Heating Button (a two positions switch, non-sticking one) 

Two versions:
* with an extra LED circle above
* without an extra LED indicator

Original part: Renault Group [X1 Made in France]
Brown switch: 
26488 (04) <R>
253509856R
4190 20h
 <015> <POM>
...
411137
6240 12h
...

A1 yellow// has 12V+ when the ignition is on// or yellow / red
A2 empty
A3 brown// or pale brownish / red
B1 white// or white / red
B2 black// negative// or thick black / brown
B3 empty

when is pressed: the resistance between A2 and B1 becomes ~0 Ohm// it does disconnects when the button is not pressed
when is NOT pressed: the resistance between B1 and B2 becomes ~0 Ohm// it does disconnects when the button is pressed
else all the contacts are disconnected

Has a fitting/stopper next to A3. This fitter can be removed prior to the shipment if requested.

Two golden / pink LEDs under the icon and under the LED circle
> one is lit when the ignition is on

Also the version with the extra LED circle glows brightly when the button is engaged and the engine/alternator is running.

Kindly PM what kind of the LED version you need.

In general can be used as any non sticky push button.

The button label can be removed prior to the shipment if requested.

Can be connected to relays to handle high amperage if needed.

Also compatible with:
* Renault Clio
* Renault Espace
* Renault Laguna
* Renault Master
* Renault Mascott
* Renault Mégane
* Renault Trafic
* Opel Movano
* Opel Vivaro
* Nissan Interstar
* Nissan Primastar
* Iveco Daily
...

AI summary:

Elevate your Renault Master MK2's functionality with these versatile cruise control buttons / switches, designed to control multifunctional settings, boot release, and boost control. The set includes precisely engineered push switches, finished in an elegant black colour, ensuring a seamless integration with your vehicle's dashboard and centre console. Suitable for models from 1998 to 2010, these switches are a perfect match for those seeking to replace or upgrade their existing system. Crafted in France, these buttons boast a 'as new' grade and come with a reassuring 10-year manufacturer warranty, in addition to a 3-month seller warranty. Their robust build ensures durability, dustproof and weatherproof features, making them a reliable choice for any Renault Master owner. The part numbers, including 8200421910, 8200411138, 8200525404, 8200411139, and 8200441141, along with the MPN 82 00 421 910 / 82 00 411 138 / 82 00 525 404 / 82 00 411 139 / 82 00 441 141, confirm their authenticity and fitment for universal application.