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  1. #1
    Join Date
    Jun 2007
    Location
    CT
    Posts
    3

    Default Trailer Hitch Cable Harness + Module??

    I have a 2006 XC70 and have read many posts here on installing my own trailer hitch. I'm going with the Class II Hidden Hitch, and didn't want to get into any messy wiring, so I want to get the Volvo wiring harness.

    The other posts I read all seem to have been for pre-2006 Volvos where the pn 8698079 was all that was required to do the wiring. But when I look at autowebaccessories.com, it lists the wiring harness (pn 30664651 for 2005+ Volvos) AND something called a Hitch Module (pn 30664974). Does anyone know what this Module is and if I really need it?

    Has anyone else tried this on a 2005+ models? Is wiring with the Volvo wiring harness plug-and-play like it is on the pre-05 models? Thanks.

  2. #2
    Join Date
    Nov 2003
    Location
    West Sussex, UK
    Posts
    677

    Default Yes, I've done it on my 2006 model -

    Please bear in mind that I'm in the UK and for folks stateside the exact components will be different, but I feel sure the logic will be the same.

    In the UK I bought:-

    • A detachable tow hitch
    • Tow bar wiring
    • Trailer module
    So the answer to your basic question is "Yes". I have no idea what's in the trailer module, but the tow bar wiring has three flying plugs one (at least) goes into the module and one into the "logic panel" (with all the relays and fuses).

    The whole thing is most inelegant - unusual for Volvo. It was much simpler before the CANbus was started.

    However, both the cable and module come with copious instructions (here, in multitudinous languages) and illustrations. You have to read the booklets several times because they cover S60/V70/XC70 and XC90 models. It's best to cross out the pages and figures not to be used.

    A case of read for two hours and fix in 5 minutes!

    I'm sure the US version will be much the same.
    Mike.

    Mine: XC 70 Sport 2009 D5 Inscription Electric Blue.
    VNS, DSTC and 4C, BLIS, LDW ventilated leather ACC; Yummy.

    All gone now - XC70 MY 13 SE LUX Flamenco red - goes better than the '09 even with its "Polestar plus" upgrade. I justy miss the PCC...


    Hers: V60 Flamenco Red 215HP D5 (like above XC70 spec)

  3. #3
    Join Date
    Nov 2006
    Location
    NE Pennsylvania
    Posts
    459

    Default

    When I had my OEM hitch installed recently, in addition to the harness (30664651-4) they also installed a control unit (30664974-0). The parts manager had ordered this unit, not knowing if my 06 would require it. The service technician said it would.
    2006 XC70 Ruby Red, mfg 03/06 (traded)
    2005 S80 Ash Gold, mfg 11/04
    2016 XC60 T6 mfg 04/15

  4. #4
    Join Date
    Nov 2003
    Location
    London
    Posts
    125

    Default trailer wiring

    Hi,
    trailer module.
    I dont know the exact reason for the module, but
    sometimes the car brake or rear fog lamps are turned off or down so the front of your trailer is not lit up everytime you brake, or turn on the fog lamps.
    There is also mentioned in the handbook somewhere trailer detection as a wiring feature, so maybe powered trailer brakes or other trailer related functions are allowed for.
    Plus with the cambus variations in lamp curcuit loading give fault signals to the vehicles main module, maybe the trailer module actually only takes a signal from the car wiring and switches/relays the trailer lights itself so stopping false fault codes.

    well there are a few thoughts.
    Geo

  5. #5
    Join Date
    Jan 2004
    Posts
    3

    Default

    You also need to download software to enable the parking lights. So you have to go to the stealer to do it!

  6. #6
    Join Date
    Nov 2006
    Location
    NE Pennsylvania
    Posts
    459

    Default

    Now I know why I had the dealer do the installation.
    2006 XC70 Ruby Red, mfg 03/06 (traded)
    2005 S80 Ash Gold, mfg 11/04
    2016 XC60 T6 mfg 04/15

  7. #7
    Join Date
    Jun 2007
    Location
    CT
    Posts
    3

    Default

    Thanks for all the advice! Here's how it turned out:

    Hidden Hitch was simple to install...about an hour's work by myself. The wiring harness and module went in relatively easy, but a little tricky routing the wires under the rear sill trim. The harness came with two 25amp fuses to be plugged into the rear fuse panel, but there were two already there. I hooked everything up to my boat trailer and everything works! Even the special dashboard trailer blinkers were flashing when I activated the turn signals. No software upgrades!!

    Thanks again.

  8. #8
    Join Date
    Apr 2007
    Location
    Lake Tekapo, New Zealand
    Posts
    25

    Default

    My dealer told me yesterday that my 2002XC does not need any 'box' which is a nice big saving ($300)! The connector on the car is just a bunch of 'spade' type connectors so I could cut it off and use bullet type or try with the spade type.

  9. #9
    Join Date
    Jun 2007
    Location
    CT
    Posts
    3

    Default

    If by "box" you mean the hitch module, then you are right because they are only required on XC model years 2005 and newer. I got the module for around $62 plus shipping, so not sure where the dealer gets $300 (maybe that's including labor?)

  10. #10
    Join Date
    Apr 2007
    Location
    Lake Tekapo, New Zealand
    Posts
    25

    Cool

    Hi,

    Nope, the dealers here want NZ$300 for the module!!!! Thats about US$180. Lucky I dont need it!

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