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Reconnect Battery and A/C experience

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Micke.223, Aug 31, 2009.

  1. Aug 31, 2009 at 10:20 AM
    #1
    Micke.223

    Micke.223 [OP] Well-Known Member

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    So, I disconnected my battery (negative lead) to remove my front driver and passenger seats. Afterwords, I reconnected the batter and we went to out to the local casino. On the way there, I turned on the A/C and all it did was blow mild (outside vent) air. I checked and made sure the A/C light was on...I even cycled it off and on a couple of times. I finally turned it off from full blast and drove another 10 miles. On a lark, I tried it again and it miraculously worked. I tried a search but couldn' find any mention of this. I did check it again later that night and it worked, so there's no real issue. i just wanted to find out if anyone else has experienced this or knows why it didn't seem to work right away.

    Cheers,
    Mickey
     
  2. Aug 31, 2009 at 10:31 AM
    #2
    NuovoTech

    NuovoTech Well-Known Member

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    Similar thing happened to me, I've also seen a few posts here regarding this. It seems the A/C needs to recycle somehow after a battery disconnect...no big deal. ;)
     
  3. Aug 31, 2009 at 10:33 AM
    #3
    GeoTaco

    GeoTaco the town is back that way

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    did the same to me, i almost crapped my pants because i thought i Fed it up after having it for only 3 days. i turned the car off, then on again and it worked
     
  4. Aug 31, 2009 at 10:40 AM
    #4
    Micke.223

    Micke.223 [OP] Well-Known Member

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    Yeah, my butt was in a pucker too. Glad to know I'm not the only one. Must need time to "reset" something or other. Thanks for the reply.

    Cheers,
    Mickey
     
  5. Aug 31, 2009 at 10:42 AM
    #5
    Micke.223

    Micke.223 [OP] Well-Known Member

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    I swear I did numerous string and key word searches. My "search-fu" skills must be weak. :eek: Thanks for taking the time to reply and help set my mind at ease. :)

    Cheers,
    Mickey
     
  6. Aug 31, 2009 at 10:42 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    The A/C system on the second gen's has servo-motors and an amplifier to control the venting plenums and air direction. The A/C controls also run through this amplifier (if I remember the diagram correctly). Servo-motors need to "re-home" themselves when they are powered off. It is likely that the system shuts down until the homing is complete.
     
  7. Aug 31, 2009 at 10:51 AM
    #7
    Micke.223

    Micke.223 [OP] Well-Known Member

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    That's got to be one of the coolest techie ways to say "reset" that I've ever heard. ;) Seriously though, thanks for taking the time to provide a detailed explanation. I am totally at ease with yesterday's occurrence.

    Cheers,
    Mickey
     
  8. Aug 31, 2009 at 10:52 AM
    #8
    sriley727

    sriley727 Well-Known Member

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    Same thing happened to me when i disconnected the battery to do my cruise control install. Came back on in 5 mins or so. But, yeah, my ass puckered up quick when it wouldn't blow cold.
     
  9. Aug 31, 2009 at 11:15 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I think you just called me a nerd. :confused:

    It's cool. :D
     
  10. Aug 31, 2009 at 3:59 PM
    #10
    MWilliamson

    MWilliamson Well-Known Member

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    the last two times i unhooked my battery to change out a radio, mine did this. The a/c would not work at all the next morning driving to work until i got off of the interstate and slowed down, then the cold air would kick on!
     
  11. Aug 31, 2009 at 4:34 PM
    #11
    kbaum08

    kbaum08 Well-Known Member

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    Great post, same thing happened to me. It would not work on a 100 mile drive after I had it in to the dealership for problems with the radio they obviusly had taken the battery leads off. Next day and ever since it has worked spot on.
     
  12. Aug 31, 2009 at 8:06 PM
    #12
    Monarch

    Monarch Threadkiller

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  13. Aug 31, 2009 at 8:11 PM
    #13
    carmellocafe

    carmellocafe Begin With The End In Mind.

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    To prevent shorting any electrical circuit I guess.:confused:
     
  14. Aug 31, 2009 at 8:48 PM
    #14
    tammikm

    tammikm Well-Known Member

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    my 2006 DC did this as well after I had a remote start put in..thought it was broken, then the next day it worked fine. i was like, WTF...
     
  15. Aug 31, 2009 at 11:49 PM
    #15
    JKD

    JKD Well-Known Member

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    It depends on how close you are to airbag circuitry. It's a "just in case" precaution. 09+ all have airbags in the seats, so you would want to follow all airbag precautions before removing/installing a seat.
     
  16. Sep 1, 2009 at 3:57 AM
    #16
    sriley727

    sriley727 Well-Known Member

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    Safety first! :D
     
  17. Sep 1, 2009 at 4:24 AM
    #17
    reg boulette

    reg boulette Well-Known Member

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    Someone with an electrical background will jump in here, but practically any work done on your truck should necessitate disconnecting the battery first. In the olden days, electrical circuits in a vehicle were 'dead' until switched on - except for clocks etc. Now, there is always some current running through various circuits to maintain ECU settings memory etc. and likely AC setting memory as well. It was also explained to me once, that money was saved in wiring harnesses by having components 'hot' with the circuit interupting off / on switching done somewhere downstream.
     
  18. Sep 1, 2009 at 5:39 AM
    #18
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That's a good explanation. The body of the truck is the ground which is the negative side of the battery. So that cuts down on half the wiring.

    On the safety side, you might think it's just a vehicle. But that battery has the potential (meaning stored or available energy) to kill. You can get a nice jolt if you don't take precautions, and you could screw your truck or electrical components up.
     
  19. Sep 1, 2009 at 9:23 AM
    #19
    gfiber

    gfiber Well-Known Member

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    The others are correct. One needs to be careful when playing with DC electrical. If you were connecting up a big audio amplifier maybe using some #8 or 10 cable and accidentily had a quick short to ground, you could start a fire. 12 volt automotive batteries can deliver upwards of 400 amps of current plenty enough to weld with. ALWAYS remove not only the battery negative terminal but also any rings, watches, bracelets anything metal from your hands.

    Gary K8IZ
     
  20. Sep 1, 2009 at 10:03 AM
    #20
    Micke.223

    Micke.223 [OP] Well-Known Member

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    Like JKD said...I disconnected mine because I have airbags in my seats. I didn't want to chance setting those puppies off while I was disconnecting them (under the seats).
     
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