MK4 Golf Climatronic install into MK2 Golf

Discussion in 'Electrical' started by rubjonny, Aug 7, 2013.

  1. Salveno New Member

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    Hi,
    My car has the drain plug yes.
    I have started the process, soon I will be at the point of no return.
    [​IMG]
     
  2. Salveno New Member

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    1 hour got me this far.
    [​IMG]
     
  3. rubjonny

    rubjonny Administrator Admin

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    good progress :)

    one thing, you have an indicator relay in the rear wiper slot 11 on the fusebox :p
     
  4. swiftkid New Member

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    Been reading this thread on a daily basis and finally got my controller powered up last night. As always rubjonny had been a legend helping get wiring diagrams for install in a corrado, it's a little different but most of the info still applies.

    I'll try add a few other hurdles I've had to jump tonight.

    T12a - on climatronic loom to main car harness:
    1 - grey/white - diagnostics K line, I ran it down to the connection board just in front of the dash
    2 - brn/blu - a/c on signal, rad fan control unit T14/8 (mk4) ecu connection T80/10 or T24c/14 (passat) - bin, the ECU controls the fan on MK4s so not needed if you are using original
    3 - brn - n/a
    4 - gry/blu - n/a
    5 - brn/yel - outside air temp sensor, mines in the rain tray at the moment but will relocate and mount it next to existing external air temp when engine loom comes out next
    6 - blu/blk - n/a
    7 - yel/blu - n/a
    8 - wht/grn - sunlight sensor in top of dash, haven't quite decided where this is going yet, there's a vent blank in the middle I was going to try mount it underneath
    9 - blk/wht - rad fan control unit T14/12 (mk4) a/c pressure switch (passat, early mk4) - bin, the ECU controls the fan on MK4s so not needed
    10 - blu/wht - vehicle speed signal - added a connector on and plugged it into the connector block above the fusebox with the rest of the VSS
    11 - gry - n/a
    12 - red/blu - outside temp signal to dash clocks pin T32a/26 (feeds the temperature display on the clocks) - bin, existing sensor remains

    T17a - on climatronic loom to main car harness:
    1 - blk/blu - ignition live to blower fan and control unit (25a fuse) - I used Q2 (blk/yel) which goes into the white plug that used to go into the heater control
    3 - blu/red - ecu pin 10 or 40 (mk4) n/a (passat) -
    4 - grn/brn - engine speed signal - tap into G1/11 or U1/11
    5 - blk/blu - ignition live - Q4, this powers the glove box light & supposedly the VDO gauges in the centre console
    6 - brn - earth - I just plugged this into the terminal block on drivers side
    7 - red/gry - permanent live feed - now I think this is aircon related so plan on leaving it disconnected
    8 - brn/wht - climatronic sensor common ground (for outside air temp sensor & sunlight sensor)
    9 - pur/yel - n/a
    10 - gry/blu - dash lighting, connected this to the power from the old dash lighting, there's a couple of 2 pin plugs you can pick from. Should be Q6
    11 - yel/red - n/a (late mk4, passat) a/c pressure switch pin 3 (early mk4) - as T12a/2
    12 - grn - ecu pin 10 or 41 (mk4) ecu connection T80/8 or T24c/11 compressor switch off? (passat) - as T12a/2
     
    Last edited: Jun 12, 2019
  5. rubjonny

    rubjonny Administrator Admin

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    So you arent going to run aircon with this? as thats what the 2 wires from the climatronic panel to the fan control module are for, rather than just fan control.

    with engine speed signal this expects a low amp ecu signal, so it wont work with the mk2 signal. If you have mk3/4 clocks with ecu signal sent thru fusebox from G1/12 then for the dash loom you can use D/6 as this is common to the rev counter pin :)

    what I did on mine was run it to the ABF ecu wire with a plug inline, leaving the mk2 coil negative to G1/12. As the ABF ECU only has the 1 aircon signal wire to a 2 pin plug, I put the old ABF ecu green/white rev counter wire into the empty slot of the aircon plug and put a mating connector on my climatronic dash harness for them both.

    T17a/3 and 12 are both feeds to tell the ECU aircon is active, if you aren't running the aircon part then neither are needed. From lots of digging about I believe the functions are:
    T17a/3 (T12/3 on main panel) - blu/red - AGU pin 10, AUM pin 40 - (A/C readiness) - 12v signal 'A/C requested' (A/C switch on)
    T17a/12 (T16b/12 on main panel) - grn or grn/gry - AGU pin 8, AUM pin 41 - (engine electronics - bi-directional) - 12v signal 'A/C OK' (all sensors report OK)

    so for a MK2/3 ECU with just 1 trigger you would want to use T17a/3. T17a/12 probably wouldn't work on a MK3 ECU, but it may work on the later ones with 2 wires. possibly.

    on the B5 passat its a little different:
    T12/2 - blk/yel - AEB pin 10 - (idle speed control/boost) - live when A/C switched ON and/or heated screen ON
    T16b/12 - blk/gry - AEB pin 8 - (engine electronics - bi-directional) - 12v signal 'A/C OK' (all sensors report OK)

    so for an earlier car T12/2 would do you, and I guess it woudl also work on a MK4 panel though when you go into VAGCOM to set the coding to passat or mk4, this might have the side affect of switching the 'ac requested' output between pins 2 or 3 on the t12 pin plug, something I haven't messed with.
     
  6. swiftkid New Member

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    No, I'm just using the corrado fan box like you have done. Don't need aircon so no plans to ever install it, plus it just makes my life that bit easier.

    I've had a bit of a dumb moment, I'm running an Audi A3 3.2 and the tacho doesn't actually work. I did add the pin into the ECU, think it was T121/37 or 54 same as mk4 but nothing. I've seen it flutter a couple of times but nothing more than that. Would you happen to know if, once I have a canbus convertor for the tacho I could borrow that signal? Any idea why the climate control needs speedo & tacho signals? VSS is easy enough although I've ran out of slots in the little junction box.

    As you mentioned somewhere earlier I'm stealing the blk/yel wire from old heater controller for power to the fan then tapping into stage 4 of the fan which is a wht/yel wire apparently (or the biggest wire).

    So just to dumb it down for me, the minimum to get this running is:

    T12a
    1 - grey/white - K line

    T17a
    1 - blk/blu - ignition live to blower fan and control unit (25a fuse) - I used Q2 (blk/yel)
    5 - blk/blu - ignition live, Q4
    6 - brn - earth
    10 - gry/blu - dash lighting, Q6

    Carrying on with my notes of installation, it was a right sod to fit. I don't like drilling holes in my car so I opted to cut and move the top bolt, you'll need some very stong glue as epoxy just doesn't even hold for 5 minutes. I used the mk4 core which meant that you get quick release fittings onto the heater matrix which is lovely and neat, I grabbed 2 straight connectors from an Audi TT from scrapyard as the mk4 golf has a straight and an elbow fitting.

    The lower bolt on the heater box looks to be in the same position as the mk2/corrado but its shorter so brings the heater box closer to the bulkhead. ideally the holes in the bulkhead want slotting and a spacer added to move it out and up a touch but I did neither, I may take it all back out again and make it fit better but for now I just want to drive my car!
     
    Last edited: Jun 12, 2019
  7. rubjonny

    rubjonny Administrator Admin

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    Yeah the can-bus tacho adaptor will put the same signal out the climatronic expects, but you dont actually need it if you're not running aircon. its there so the module switches the a.c off at high rpm, and since you'll never have it switched on its no problem :lol: Mine hasnt been connected for a while, I thought the a/c signal from the module might have been messing with my abf ecu as sometimes idle went a bit funny so I disconnected the 2 pin plug I mentioned earlier which also had the rev counter signal in. made no difference either way so its been off ever since.

    Climatronic needs the speed signal to adjust for higher/lower airflow input depending on road speed I think. You could pull the speed signal out that goes to the radio, it wont be doing anything unless you have the expensive AKTIV radio or a later OEM VW unit. Again the VSS input doesnt make a massive difference, mine has been down ever since I put the 02a gearbox in! I must have bashed something while swapping the speedometer cable as I no longer get any speed/distance/mpg readings on my MFA. Yet another job to add to the list :(

    If I was to do it again I would so the same and move the studs on the box rather than drill holes, and I will do so when the next revision goes in at some point in the future. I used the same straight fittings you did, though I found they made my heater hoses bend slightly further forward than I would like so ideally need trimming down and/or using the mk4 angled fittings. Not that it really affects anything as they can still flow fine

    as you say lower stud is too short so needs a spacer on it as I mentioned in post 7. You can see in that post I also ran out of patience and just got it in there so it was finally done :lol:

    Think that covers it for the feeds, the permanent live might be required so the unit remembers settings between drives but I've not checked it with or without. The passat doesn't have this feed so certainly not needed for it to work anyway
     
  8. swiftkid New Member

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    Ahh yes, I didn't think of the memory aspect, will test that and report back. In hindsight I really should have started this at the start of winter not start of what is supposed to be summer so I could do things properly but hey ho. I'm also doing a teves20 upgrade at the same time which means there are wires everywhere but that's nearly done so hopefully get to reinstall everything and test it.

    Out of interest where do you get your connectors from? I've got about 6 cars worth of looms I pinch connectors from but I've used all the good ones so running a bit low. Ideally I want to get male & female connectors so I can retain the modular wiring.
     
  9. rubjonny

    rubjonny Administrator Admin

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    when you make as many looms as I do spare connectors off salvaged looms is something you never run short of :lol:

    for bigger multi-pin connectors the mk3 golf is a great donor in scrappy theres one for the rear window switch loom to main electric window loom for junior timer pins. or if you look in the doors on mk4 golf & similar theres a 10 pin plug for the electric mirror plug which takes micro timer male and female pins. 6n polo has a 5 pin junior timer male & female plug for the mirrors.

    basically scrappy shopping around, its where i get my stocks of fuse and relay holders from as well
     

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