Wiring diagram of Mercedes 1991 420SEL

|       ITEM      |     WIRE COLOR     |POL|       WIRE LOCATION        |

|              12V|red *1              |+  |ignition switch             ||          STARTER|purple *2           |+  |ignition switch             ||         IGNITION|pink/black          |+  |fusebox                     ||  SECOND IGNITION|pink/green (2nd acc)|+  |ignition switch             ||        ACCESSORY|pink / YELLOW         |+  |fusebox                     ||       POWER LOCK|blue, green (L,R)   |E  |either kick or pump in trunk||     POWER UNLOCK|same wire           |   |                            || PARKING LIGHTS +|gry/wht and gry     |   |switch or anti-theft *5     ||       HEADLIGHTS|WHITE/ yellow        |+  |light switch                ||     DOOR TRIGGER|brn/gry, brn/wht/blk|-  |anti theft *3               ||  TRUNK/HATCH PIN|BROWN / WHITE/ red     |-  |anti-theft unit *5          ||         HOOD PIN|BROWN / WHITE/ gray    |-  |anti-theft unit *5          ||  FCTRY ALARM ARM|yellow/blue         |-  |anti-theft unit *5          ||FCTRY ALRM DISARM|GREEN/ YELLOW        |-  |anti-theft unit *5          ||       TACHOMETER|black               |   |ignition coil               ||       BRAKE WIRE|BLACK/ red           |+  |brake sw or anti-theft *5   ||     HORN TRIGGER|blk/pnk, blk/RED / pnk|+  |st column, anti-theft *5    ||           WIPERS|black and blue *4   |+  |wiper switch                ||  LF WINDOW UP/DN|green - black       |B  |at switch in console        ||  RF WINDOW UP/DN|green - black       |B  |at switch in console        ||  LR WINDOW UP/DN|grn/red - blu/wht   |B  |at switch in console        ||  RR WINDOW UP/DN|grn/red - blu/wht   |B  |at switch in console        |

Notes:

*1 Also BLACK/ red at the factory alarm. Do not use this feed wire for remote start.  *2 Also purple or PURPLE / white at the center console. Do not use the PURPLE / white for remote start, use the purple at the center console or switch only.  *3 Can also be found at the passenger front pin (BROWN / gray) and either rear pin or dash mounted rear dome light switch (BROWN / WHITE/ black at pin and BROWN / white at dash switch). Also the rear doors changed to BROWN / white at all locations in later production.  *4 Use both of these wires and diode isolate to get all speeds.  *5 The anti-theft module is located just below the passenger foot board.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

No problemoJeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA