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Cadillac STS Forum - 2005 through 2012 Discussion, 05 STS Remote start not working?? in Past Cadillac Vehicle Discussion; The fob's number has no real meaning. Your car can match up to four fobs and one of yours may ...
  1. #31
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: 05 STS Remote start not working??

    The fob's number has no real meaning. Your car can match up to four fobs and one of yours may be a replacement that is not matched to the car as one of the first two. Only those two can remote start your car.

    Anything else will not be inexpensive to repair.

    Good luck.

  2. #32
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: 05 STS Remote start not working??

    Yeah, I would think it has to do with the fob's and their respective settings in the system. Make sure you are saving the setting for enabling the remote start, it has to be something easy, just not real obvious...keep trying!
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  3. #33
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    Remote start in the system is on. This is the same key I used 4 days ago that worked

  4. #34
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    Re: 05 STS Remote start not working??

    how old is the 12v car battery?
    any corrosion on the battery posts?

  5. #35
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    The battery is 8 years old not really any corrosion on the terminals

  6. #36
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    Ok I'm convinced it's a car battery issue if I turn the car on and check the battery it's at 12volts and charges up to 14 quickly. If I turn the car off then the remote start will work. So I guess the battery drains slowly over a few days and doesn't have enough power to start it up

  7. #37
    curtc's Avatar
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    Re: 05 STS Remote start not working??

    that is pretty much how mine works too...random cold starts won't work on the first attempt, but will on the 2nd typically...I'll be getting a new battery soon.
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  8. #38
    Ludacrisvp's Avatar
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    Yeah the STS is REALLY REALLY picky about its battery. 8 years on a 5yr? Battery is definitely on borrowed time. Consider yourself lucky it even starts. When mine died in my DTS there was zero warning just one day it wouldn't even try to turn over and a truck couldn't jump it. New battery put in and it started without any effort.

  9. #39
    EChas3's Avatar
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    Re: 05 STS Remote start not working??

    Series 99 (or is it 109) are hard to find, but a 78 w/o top posts may fit. Optima makes one that does. We love ours.

  10. #40
    Cadzilla8's Avatar
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    Yeah what's the best type of battery to put in it and where can I get one

  11. #41
    Ludacrisvp's Avatar
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    Re: 05 STS Remote start not working??

    Service manual says it needs to be 690 CCA (cold cranking amps), model number is 101-6YR, should provide 63 A/H (Amp hours) and a 110 minute reserve capacity.

    If you feel there might be parasitic draw:

    Check and record the current reading.
    Note the battery reserve capacity, amp hour rating. Refer to Battery Usage.
    Divide the reserve capacity by 4, amp hour rating by 2.4.
    Compare this to the multimeter milliampere reading taken in the previous step. The parasitic current drain should not exceed this number.
    Example: If a battery has a reserve capacity of 100 minutes , (60 A/H) the current drain should not exceed 25 mA .

  12. #42
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    Thanks for the help guys glad I'm finally sorting battery issue out before it dies somewhere inconvenient haha

  13. #43
    EChas3's Avatar
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    Re: 05 STS Remote start not working??

    When I decided to stretch the life of my OEM battery, I caught a jump-pack for $40 on sale. I've used it for camping & backup power around the house. I never did need it in the car.

  14. #44
    johnteague is offline Cadillac Owners Member
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    Re: 05 STS Remote start not working??

    I've got an '06 STS with about 70k miles, battery in FOB and Car are both fairly new, but that's probably not the issue. I've got the amber radio setup. I go into the settings and the "remote startup" is not checked. I go into the sub-menus, uncheck everything, re-check everything, and press the back button. Everything EXCEPT "remote startup" is checked. I then look at the sub-menu's again....everything is still checked. Oh, and no..no check-engine light.

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