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Thread: Dealer can't find problem in CX5 that blows fuses

  1. #1
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    Dealer can't find problem in CX5 that blows fuses

    I'll make this as short as possible, but I think the chain of events is important to figure out what to do:

    1. Daughter leaves interior light on on 2015 CX5. Battery dies.
    2. Tow truck driver apparently connects jumper cables wrong; then corrects himself and car starts.
    3. All lights on dash illuminated. Power steering doesn't work. Car can be started, however.
    4. Tows car to Trusted Mechanic who doesn't do electrical, so then car is towed to dealer.
    5. Dealer replaces fuse**, charges her $180, and sends her on her way.
    ** There is some question as to whether this is a 7.5A fuse in fuse box or main fuse on battery.
    6. Daughter drives car to East Jesus in Central Valley of CA and problem happens again but without jump start this time.
    7. Has car towed back to dealer. Dealer spends a week but cannot find problem. Apparently replaces same 7.5A fuse.
    8. Diagnosis: either the power steering, ABS, or SRS module needs to be replaced. Cannot determine which. Dealer says we'll put in a new SRS module ($1300) and see if that fixes it.

    I now have the challenging decision of either allowing my daughter to drive a potentially dangerous car, or to blindly replace "modules" in the hope that it will solve the problem.

    What do I do?

    Thanks,

    Chuck Hawley, new member and really in need of some good news.

  2. #2
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    Does the dealer know about the tow truck driver's screw up? That kind of mistake can be harmful in so many ways...

  3. #3
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    Make sure you document everything. Keep all receipts and a log of the activities you have had to endure.
    This way when the vehicle is finally fixed, you can go after the tow truck driver/company for reimbursement.
    No way should you be paying for his screw up.
    Hooking up the cables backwards on today's vehicles, with all the electronics in there, is a sure fire way to fry something.

  4. #4
    Registered Member Ronzuki's Avatar

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    Everything on that 7.5A circuit (or what ever it is, which is pretty important info to know in order to diag) is suspect at this point after the tow truck driver's screw-up. Since the PS didn't work initially after said screw-up as you say, and it's electric, I'd say that's a great place to start digging. Presumably the PS worked after mystery fuse was replaced the first time. It is now blown again, and presumably, the PS is no longer working, again? If not, the PS clearly was not happy about the reverse polarity condition. Doesn't mean anything else on that circuit, or the entire car for that matter, isn't subject to pre-mature failure. Reverse polarity protection is probably not something the nave automotive automation engineers have thought a need for...yet. that sort of 'feature' in controls and components costs more for certain. Dealer needs to know this occurred and you will likely need to fight the towing company to be reimbursed for the fix(es) which Mazda certainly won't cover when they learn the truth...which they'll need to know so they can fix the car.
    Ron
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    Good idea re: documentation. Tow truck company owner is an a**hole, and was very rude to my daughter when she contacted him. Has TERRIBLE reviews on Yelp. Shoulda know better...

    Chuck

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    There are about six 7.5A fuses, and one of them is identified as the SRS circuit. There is a 50A fuse for the ABS/Stability System. I can't find any fuse for power steering.

    This appears to happen when the car is at rest.

    I think the dealer, as well as Mazda US has given up, and is now in the mode of replacing expensive parts until the car stops failing...

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    Quote Originally Posted by chuckhawley View Post
    Good idea re: documentation. Tow truck company owner is an a**hole, and was very rude to my daughter when she contacted him. Has TERRIBLE reviews on Yelp. Shoulda know better...

    Chuck
    It wasn't AAA by any chance, was it?

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    I'd start by replacing all of the 7.5A fuses as well as the 50A fuse. The reverse poliarity may have fried something in more than one fuse, so the problem continues to exist as the chain remains broken despite the replacement of one fuse only. It's a cheap enough fix, and just may do the trick. If it doesn't, then you should try an experienced mechanic, other than the dealer ... replacing expensive modules blindly is no way to run a service department.

  9. #9
    Registered Member tibimakai's Avatar

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    Fuses blow for a reason. All the fuses were checked(in the whole car)? They check out OK?
    I would start watching some Youtube videos, like this one:
    https://www.youtube.com/watch?v=lQowZNSrffA

  10. #10
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    Quote Originally Posted by madar View Post
    It wasn't AAA by any chance, was it?
    No, as it turns out, it was the recommended tower for State Farm. Incidentally, we've had a series of not-our-fault accidents among my daughters, and State Farm has been A+ in taking care of the claims. I wouldn't normally call out an insurance company, but they have been fast and generous.

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    Quote Originally Posted by Joe Willie View Post
    ...replacing expensive modules blindly is no way to run a service department.
    Truth! I'd be embarrassed to recommend that "strategy" to a customer...

  12. #12
    Registered Member erhayes's Avatar
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    YOUTUBE watch by tibimakai above is the way to check this problem.

  13. #13
    Structural Member shadonoz's Avatar
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    Quote Originally Posted by tibimakai View Post
    Fuses blow for a reason. All the fuses were checked(in the whole car)? They check out OK?
    I would start watching some Youtube videos, like this one:
    https://www.youtube.com/watch?v=lQowZNSrffA
    Unbelievable!
    Thanks for that link.
    Great job. I liked his beat up hands. No gloves.

  14. #14
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    If the circuit is blowing fuses and all the devices attached to the circuit check out. Then it's the wiring harness. A wire got partially melted and is shorting.

    Oh, and you need to dump this Mazda dealer. These guys are idiots.

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