DIY Heated Seats C Class W203 with pics

Discussion in 'Interior' started by jpod, Feb 29, 2016.

  1. jpod

    jpod Active Member

    Messages:
    70
    Joined:
    Aug 8, 2015
    Car:
    Merc C180k 2005
    Please use my advice with extreme caution I am an interested rookie, not a Pro.

    Heated seats
    Google “Auto Carbon Heated seats retrofit kit Universal”, got mine on Amazon.
    The kit is superbly made in my opinion and a bargain at £23, there is a 15A fuse holder included.
    The wiring includes a positive and earth. A relay which I understand is a good safety point for high wattage electrical items. A decent 3 position round switch with a red led. The wires are nicely wrapped in PVC flexible tube.
    I only fitted one pad on the driver’s side to warm my **** on the drive into work on cold mornings.
    Minor issue - I will fit the passenger pad eventually – but I will need to lengthen the wire on the unused pad in order to do that – I can’t see how the current set up can reach 2 pads in two seats, certainly can’t reach on the C Class.

    First stage – fitting the pad
    Undid the 4 Star E Torx holding the passenger seat in, leant it back, undid the two retaining clips at the front of the bottom seat base and lifted this out.
    It is fairly hard to remove the ‘U’ shaped retaining clips all the way around the base of the seat cover, did it with a screwdriver and it took several minutes.
    Once off, unclip some upholstery clips, plastic on metal bars and cut some holes and fit your heated pad. I set it up so that the cable exited in the offside rear corner of the seat.
    Put the cover back, clip in the ‘U’ clips and refit the seat cover. I added some incredibly handy ‘plastic split cover’ to protect the wire where it exited the seat.
    Loosely fit the entire seat and move on to the second bit.

    Second stage – centre console and power from cigar lighter
    Put handbrake on, pull up gear stick surround and lift up the large gear change trim – fiddle a bit and lift it away.
    You can remove the gear knob by twisting the plastic base underneath it – I didn’t bother.
    On the driver’s side rear of the gear change plastic housing there is a black plastic bitty which you push to release the gear stick and move it backwards.
    There are two plastic clips either side of the facing edge of the ashtray and it lifts forward and out. On the back is the cigar lighter power supply, the connector pulls out to one side.
    Brown = earth (connects to the black wire to the seat cable loom)
    Black and yellow = power which is switched on by the ignition (connects to the red wire in-line fuse holder and the red wire to the seat cable loom)
    The other wire is for illumination to the cigar lighter
    I bared some wire and used some very lazy power connectors to tap power and earth. They are Wago compact connectors for home electrical installations, very fast, I like them.

    Third stage – cables from the seat pad loom to the centre console
    I couldn’t figure out how to remove the coin slot holder? Anyone know?
    Anyway, I poked about with a length of white 13A power cable and noticed a bit of a route from the side of the centre channel into the gear change compartment. I used a tail and insulation tape to pull the cables through. I carefully made a note of the wire arrangement and took off the white plastic connection block, threaded the wires through and then I refitted it.
    Once all connected I did a test – had a warm bum - success!
    Proceeded to drill a hole for the switch in a flat bit of the gear stick surround. First I piloted a small hole with a metal drill bit, then used a Flat Spade Wood Drill Bit size 19mm from the metal front, once through the alloy veneer I then worked from the back. A little ‘anti-rotation’ notch was needed to fit the switch – modified the hole with the side of the metal drill bit to accommodate that notch.

    Final stage – tidying the cables under the seat and refitting the seat
    I used cable ties to fit the relay and secured the cable beneath the driver’s seat, there are plenty of rails and things under there to offer safe fixings.
    So far the seat has been a success – takes a few minutes to heat up – perhaps because the upholstery over it is fairly substantial but it is well worth the effort.
    I plan to fit the passenger seat pad next, just need to lengthen the cables – for that I will use a more appropriate technique of cutting, adding in a length of cable by splicing and soldering, covering the join with heat shrink.

    Summary
    I found tons of cash and a priceless ring, the sale of which should pay for my installation although it does look lovely on, I may have to keep it.

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    Remove gear change surround, unclip rear electrical connector

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    Lift out gear surround

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    Push here to move gearstick rearwards

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    Drivers

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    Base off

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    The corner where I want the cables to exit, you can see the ‘U’ shaped seat cover attachments

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    Offering up the heated pad

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    Tinkering

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    More tinkering

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    Sorted

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    Bit of split cable to protect it

    Tabs on the cigar lighter tray, one on either side

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    Lifting it out

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    The cables to the cigar lighter

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    The back of the cigar lighter

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    The connector from the loom

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    Taking out each connector with a small screwdriver to push on tabs

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    Last edited: Feb 29, 2016
    6 people like this.
  2. OP
    OP
    jpod

    jpod Active Member

    Messages:
    70
    Joined:
    Aug 8, 2015
    Car:
    Merc C180k 2005
    Part 2

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    Cabling ready to go

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    Finished

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    Switch

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    Reconnecting my Kino Bluetooth and the audio jack that connects to the Aux of the car stereo

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    2 people like this.
  3. Hawkwind

    Hawkwind Hardcore MB Enthusiast

    Messages:
    475
    Joined:
    Oct 2, 2013
    Location:
    Brighton
    Car:
    CLK 320
    Great job!

    I think maybe if you got two heater pads and only one switch, the second heater pad is for the backrest of the drivers seat and you would have to buy another kit for the passenger seat.
     
    1 person likes this.
  4. OP
    OP
    jpod

    jpod Active Member

    Messages:
    70
    Joined:
    Aug 8, 2015
    Car:
    Merc C180k 2005
    Haha, I didn't think of that - what a plonker! That would be toastie.

    Hmm... I think I may give that a go,...thanks Hawkwind. To be continued....
     
  5. Druk

    Druk Administrator Staff Member

    Messages:
    5,309
    Joined:
    May 28, 2004
    Location:
    Not far from Edinburgh.
    Car:
    2011 S212 E350CDi. 1981 R107 300TurboDiesel.
    Great thread. We like piccies. :thumb:
     
  6. Charles Morgan

    Charles Morgan MB Club Veteran

    Messages:
    8,206
    Joined:
    Feb 2, 2010
    Car:
    Mercedes 250CE W114, Alfa Romeo GT Coupe 3.2 V6
    Seconded! Looks like the job paid for itself too....
     
  7. drwizz

    drwizz New Member

    Messages:
    23
    Joined:
    Feb 24, 2016
    Location:
    devon
    Car:
    2005 c320 cdi w203
    Braver man then me
    There is no way i would tackle something like that
     
  8. m2287

    m2287 Hardcore MB Enthusiast

    Messages:
    3,014
    Joined:
    Jan 27, 2010
    Location:
    cambridge
    Car:
    Bentley Continental GT
    This also works when replacing the broken heater elements in your seats, literally cut the old cables, attach the new mats to old connections and off you go!!
     
  9. zipdip

    zipdip Hardcore MB Enthusiast

    Messages:
    2,267
    Joined:
    Mar 5, 2015
    Location:
    Essex
    Car:
    s320
    Very clear pictures and well done,I thought about doing it to my S320 great car no heated seats,I hoped I would be able to buy the door heater controls and then fit heated seats,but experts assured me that MB do not use the same wiring loom for cars with heated seats as for non heated seat cars,still think that is a little strange all it is a is a few wires and a relay.but hey ho I still have a cold bum on the frosty mornings.
     
  10. OP
    OP
    jpod

    jpod Active Member

    Messages:
    70
    Joined:
    Aug 8, 2015
    Car:
    Merc C180k 2005
    Thanks fellas. It is a pleasure to put something back on this forum - I have learnt tons from your combined MB wisdom. Turns out the ring was a priceless 'Claire's accessories' circa 2014.
     
  11. whitenemesis

    whitenemesis MB Club Veteran

    Messages:
    15,411
    Joined:
    May 7, 2007
    Car:
    Lexus RC300h F-Sport 2016
    Nice write-up :thumb:

    Looks like the kit I had fitted to the rear seats of my S203. Buttons located on the 'B' pillars and power taken from a spare fuseway in the rear SAM
     

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