Sprinter T1N Sprinter Wiring
example: S126 = Central Door Locks
If you’re doing some DIYing and looking to see what wire powers what.. Here’s a helpful breakdown of all the reference numbers for controls and switches of a Mercedes, Dodge, Freightliner Sprinter Van. (thanks to autostaretx)
While you may find it easy to splice or tap into existing wiring. We highly recommend creating a dedicated fused distribution block with it’s own dedicated power in. We found this Blue Sea Systems one to work quite well for small power needs, like UBS ports or LED lights.
You should also use the correct gauge wire for your application. Using too thin of wire will cause it to heat up and melt the insulation either catching the insulation on fire or grounding the exposed wire. This is how many DIY vans typically burn down.
Check our other post on calculating wire gauge / thickness for your application.
Here’s a Switch Number and it’s associated Function
sorted by switch number:
----------
S2 - combination (multi-function) switch
S2s1 - high beam selector switch
S2s2 - exterior light switch
S2s3 - turn signal switch
S2s4 - hazard warning switch
S2s5 - horn contact
S2s6 - wash button
S2s7 - wiper switch
-------------------
S3k - high pressure switch (cooling)
S4 - low pressure switch
S6 - additional lamps restart switch
S8k - pop-up roof lower limit switch
S9 - pop-up roof upper limit switch
S12 - driver heated seat
S18 - ATA (hood) contact switch
S21 - horn switch
S25 - headlamp range adjustment switch
S25b, S29b, S30b, S31b, S32b -- swinging door switches (bus)
S34b - 2-stage heat exchanger switch
S39b - air cond switch (on/off)
S41 - crewcab right door contact switch
S41b - evaporator temperature switch
S42 - left door contact switch
S42b - low pressure/high pressure switch
S43 - right door contact switch
S44 - rear fog light switch
S45 - driver door lock switch
S48 - ASR switch
S53 - Steering lock with mechanical repeat start lockout
S57 - differential lock switch
S73 - Warning signal system switch
S76 - seat belt buckle switch
S80 - parking brake switch
S81 - rear window heater button
S85 - driver interior lighting pushbutton
S86 - rear interior lighting pushbutton
S87 - Aux heater switch
S90 - roof fan switch
S92 - panic alarm button
S97 - panic alarm button
S99 - ATA towing/interior motion sensor button (anti-theft)
S100 - Aux heat exchanger double-contact pushbutton
S101 - adjustable exterior mirror switch
S104 - differential lock switch
S106 - front passenger power window switch (driver door)
S107 - passenger heated seat
S108 - driver power window switch (driver door)
S109 - front passenger power window switch (passenger door)
S114 - left sliding door contact switch
S115 - right sliding door contact switch
S116 - tailgate/rear door contact switch
S119.1 - fog light switch
S124 - reading lamp switch
S126 - central door locks
S127 - trailer recognition switch
S137 - roof air conditioner switch
S138 - temperature switch
S161 - ADR ON switch ('working speed control')(cruise control?)
S169 - rollover switch (or: arcing switch)
S139 - ignition lock switch
S158 - right interior lighting pushbutton
S163 - cargo area light/cargo area fan pushbutton
S165 - left interior lighting pushbutton
