HOW TO: Retrofitting tap to pass turn signals to your W123 / W124 / W126 - PeachParts Mercedes-Benz Forum

compu_85 · #1 04-11-2010, 02:30 AM

Many newer cars have a nice feature where taping the turn signal lever will cause the blinkers to blink 3 times then stop. This is very handy for changing lanes on the highway. Volkswagen created a retrofit kit to add this feature to previous models. Because Mercedes and VW wire their turn signals & hazard light switch the same way adding this retrofit kit to the Mercedes is very easy.

Stuff needed:

Turn Signal Convenience kit for the A3 Golf, VW part # 000 998 229 , ~$70
- Includes relay (000 953 227 A), relay socket, wiring pigtail, horrible instructions, a zip tie, and some crimp connectors
Screwdrivers to disassemble the center dash
Wire strippers
Soldering iron / solder
Forceps

First let's look at the wiring diagrams.

For the Gen2 W126, others are probably similar:

The "Komfort Blinker" instructions:

So:

Code:

Pin# | Mercedes  Color | VW Add On Color   | Komfort Relay Pin
31   | Brown           | Brown             | 4
15   | Black / Violet  | Black / White     | 6
49A  | Blk / Green / White | Green / White | 8
49R  | Black / Green   | Green             | 5
49L  | Black / White   | White             | 2

Continued...