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Mazda CX-9 Do it yourself solutions



  • abpelch1abpelch1 Posts: 48
    It depends on what you are towing. If your trailer has a 4-pin connector (for light trailers without brakes), you have everything you need in the factory towing harness and do not need to run any additional wires. If you are towing anything that requires a 7-pin connector (heavier trailers which have brakes) and plan to actually use the trailer brakes, you WILL need to run additional wires back to the engine bay. The CX-9 does not have the factory wiring to accomodate 7-pin connectors.
  • pcz0925pcz0925 Posts: 9
    Please forgive my ignorance. When you state that the wiring should be at the rear end, do you mean under the car and if so, what should I be looking for?
  • jneevejneeve Posts: 4
    The wiring harness is tucked against the back of the vehicle on the right side, underneath the rear storage compartment.

    Take out the two little pins holding it in, and the entire compartment comes out..

    Then look under the harness against the body, sort of underneath the tail light... its a 6 pin white connector taped to it. You can use a voltmeter with ground on the black pin, and map out the remaing pins (tl, tr, brake, running lights, etc)
  • cericceric Posts: 1,093
    I couldn't have answered it better than jneeve did.
  • Hi Ceric,

    If I have a 2008 AWD CX9, and I get the tow added at the dealer, is this an after
    market hitch and hence, 3" below the bumper?
    Mazda dealer says he can install the hitch and have it covered by Mazda. Does
    this mean his will be through the bumper or below it? I can presume it is after market and hence below the bumper?


  • cericceric Posts: 1,093
    "get the tow added" needs clarification.
    No one can add the tow "package" which includes
    - heavy duty radiator
    - dual fan control modules (instead of one) - look for a silver module with heat sink about 2-3 inches in size near fan. CX9 has two fans. The one with Tow package (real OE one) has two fan control modules.
    - heavy duty transmission cooler
    - ECU programming revision - change gear shifting points and and stability control algorithm to counter trailer swinging.
    - hitch and wiring

    I am guessing that your dealer only gives you the factory hitch and wiring.
    (i.e. for you to tow 2000lb or less only)
    The factory hitch sticks out at the lower part of the rear bumper (better integration). However, it has 2 1/4" inch opening. Most after-market hitches available for CX9 have 3" inch opening.

    Depending on how you plan to use your CX9, a full-blown Tow package may not be best for you unless you need to tow more than 2000lb. Those changes with Tow package could slow down the performance of CX9 or decrease MPG (a tranny that is too "cool" may increase MPG slightly). The gear-shifting algorithm could also costs you MPG as well. Just a reminder that it's not "the more, the better". :)
  • newawdcx9newawdcx9 Posts: 7
    Many have tried to answer the towing question for 2009 CX-9s. I have recently purchased an AWD CX-9 and thourghly researched the towing question. I do not know the answer for earlier models. Be cautious in that some of the Mazda literature has conflicting information and unless someone carefully researches this question they will likely have the incorrect information. So, here is the answer:

    All FWD CX-9 come standard with a towing capacity of 2000lbs. In order to tow to this capacity you will need to add a tow hitch and wiring harness neither is which is available from the factory but is available from the dealer.

    All AWD CX-9 come standard with a factory tow prep package which consists of a larger transmission cooler, revised ECM and wiring harness. With this tow prep package the towing capacity is 3500lbs. In addition, you will need to add a tow hitch which is not available from the factory but is available from the factory.

    The FWD Grand Touring CX-9 does have a factory towing package available which includes the tow prep package metioned above plus a tow hitch. This will allow towing to 3500 lbs. However, in order to get the towing package you also need to order a "mandatory" GT assist package.

    The towing prep package cannot be installed by the dealer only the factory.

    The factory tow hitch which is available for the dealer to install, is a class II (3500 lbs) hitch with a 1.5" reciever.

    I am getting a Class III hitch installated so I can get a 2" reciever for which I have a bicycle rack and other towing items. I do not know how it will integrate with the bumper but I will let everyone know.

    Don't reply that some literature or someone told you something else. This is what I learned over a 2 week period proir to purchasing my CX-9.
  • cericceric Posts: 1,093
    I made a mistake in my post stating 2 1/4" vs 3" when it should have been 1 1/4" (not 1.5", either) for class-II and 2" for class-III.

    I hope newawdcx9 was not implying that I provided wrong info. Because if I did, I certainly would love to know and correct it in my head.

    I have a 2008 model.
    newawdcx9 seems to know more about 2009 models. :)
  • howardruhowardru Posts: 155
    Ceric, rarely....if ever is wrong!

    (Except when conversing with his wife)
  • newawdcx9newawdcx9 Posts: 7
    Not wrong but incomplete.
  • redbull22redbull22 Posts: 4
    I just bought a 2007 cx9, it came with SIRIUS Satellite Radio (I don't want it), but because it is installed I can't use my aux port. does anyone know how to disconnect the satellite radio and re-connect the aux port. Or do I really have to buy the "switching box"?
  • cericceric Posts: 1,093
    If I were you, I would talk to my dealer (the guy who sold you the CX9) nicely to see if he/she can pull the Sirrus unit out and connect the Aux jack.
    That way, you get what you want, and have an Sirrus unit (for the dealer as parts) or for you to sell it on eBay. Make sure you have the whole accessories of Sirrus if you want to sell it on eBay.
    Depending on your negotiation with the salesperson, he/she may or may not charge you for the labor cost (get behind the center console and reconnect wirings).
  • montezumamontezuma Posts: 1
    Does this also apply to the 2008 CX9. All AWD have the factory tow pre needed?

  • cericceric Posts: 1,093
    Allow me to reiterate,
    all 2009 AWD (Sports, Touring, or Grand Toruing) models have Tow Prep as standard. No so for 2008 or 2007.
  • mbd57mbd57 Posts: 7
    You state AWD 2009 Tow prep is standard - where is the harness located or is the tail that plugs into it to give your a flat 4 wire connector available from Mazda?
  • cericceric Posts: 1,093
    I don't have a 2009 model.
    My 2008 did not come with Tow package.
    Here is a thread you may follow or ask question.
  • For the 2009 with the wiring harness, what do i need to complete the harness. I assume buying a $50 wiring harness from Etrailer designed the CX-9 is overkill (part 118442, because it has the mazda connectors to plug into the lights harness.

    Or can I go with a generic harness like this for $25 and tap into the wiring harness mentioned -

    Or just the $5 harness here

  • gtxjoe1gtxjoe1 Posts: 2
    edited May 2010
    The answer for 2009/2010 CX-9 all AWD models or FWD GT models : You can buy Mazda OEM wiring harness 0000-8E-N13. Picture is here:
  • Looking to surprise my wife for Christmas and install satellite radio in her 2009 CX-9. Since the dealer wants $350 for parts and $360 for labor I thought I'd try to do it myself. Please stop me if this is ill advised. Otherwise, can anyone tell me which OEM parts I need, where I can get them cheapest and where I can find step-by-step instructions for installation?
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