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HVAC Backlighting Issues (Not a Burned out bulb)

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TK89, Dec 8, 2014.

  1. Dec 8, 2014 at 6:44 PM
    #1
    TK89

    TK89 [OP] Member

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    Hey guys,

    I'm having a hell of a time figuring out why some of the backlighting is non-operational in my '05 Tacoma. Initially, I noticed the HVAC backling was out and got new bulbs, but that didn't work. Then I checked all my fuses and they seem to be good as well. I'm not sure what else it could be. I also have an '09 Tacoma so I tried swapping the HVAC control units. Both units light up in the '09 but neither one lights up in the '05. Addionally, the backlighting for the fog light switch and the Rear Dif lock switch are also out. Anybody have any idea what might be causing this issue?

    Any help would be appreciated.

    Thanks.
     
  2. Dec 8, 2014 at 6:47 PM
    #2
    moondeath

    moondeath The answer to divorce...... Tequila!

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    Did you check all the fuses in the engine bay also?
     
  3. Dec 8, 2014 at 7:00 PM
    #3
    TK89

    TK89 [OP] Member

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    I checked all of the standard (type A) fuses in the engine bay, but not the larger square fuses there.
     
  4. Dec 8, 2014 at 7:03 PM
    #4
    Jerez

    Jerez SoCal LED Dash Swap

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    probably its going to be the dimmer switch (if seen it happen)

    thats if the other lights dont light up (not counting the instrument cluster)
     
  5. Dec 8, 2014 at 7:42 PM
    #5
    landphil

    landphil Wishin' I was Fishin'

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    Yup, I'll bet the stereo backlighting is out as well as the switches and the HVAC controls. These trucks have a dual pole dimmer rheostat, so the dash cluster is on a separate curcuit within the dimmer.
     
  6. Dec 8, 2014 at 8:52 PM
    #6
    TK89

    TK89 [OP] Member

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    Well, I replaced the stock radio with an aftermarket head-unit so I don't know if the backlighting is out there too. If it is the dimmer switch, is the fix as easy as just getting another one and swapping it or is it a more involved process that I might want to have a professional do?
     
  7. Dec 8, 2014 at 9:44 PM
    #7
    TK89

    TK89 [OP] Member

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    UPDATE:

    So I took the Rheostat/dimmer switch out of my '09 (which I know works properly) and tried it in the '05 and the backlighting in the HVAC, etc is still not working...
     
  8. Dec 8, 2014 at 9:48 PM
    #8
    moondeath

    moondeath The answer to divorce...... Tequila!

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    I would start checking voltage at the connectors and work your way back.

    Easier said then done of course.
     
  9. Dec 9, 2014 at 7:08 AM
    #9
    landphil

    landphil Wishin' I was Fishin'

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    Huh. Another question then. Do all your park / tail /license plate lights work as they should?
     
  10. Dec 11, 2014 at 3:03 AM
    #10
    TK89

    TK89 [OP] Member

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    Yeah, all the other lights are working fine it's only the HVAC and the fog light switch that aren't illuminating.
     
  11. Dec 11, 2014 at 5:45 AM
    #11
    Pepe98

    Pepe98 Love moding vehicles as hobby

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    1st Update: 500 miles Rugged Ridges Matts, Dimming rear view mirror with comp/temp, AeroForce Tech Interceptor Gauge, Aeries Professional Bull and Nerf bars, LED Lighting complete in-Cab, LED DRLs, AMP Bed Xtendr, Extang Trifecta Signature Series Tonneau, Rigid Ind LED Lighting 30" E and 20" SR series, Rigid LED Grill insert, Katskinz Leather Interior, Custom 100amp Electrical Sub Panel x2 (Engine bay and Interior), custom vinyl bed side, interior accent lighting galore (Oznium), OTTRAW, switches, under hood lighting, Red Line Elite hood struts, Power Pop-n-Lock, Under Bed Rail Lighting (switched), Custom Tinting... More to come
    I had the same issue on my 2014. I blew something. Replaced the Dimmer Rheostat with a new one (found cheapest on line for about $100, just under actually) and it fixed everything and part of the AC HU lighting. By this I mean they are on and VERY dim but show up in the dark. all of my dash lighting was out, to include the instrument cluster. The AC HU lighting is not bright like the rest of the ambient lighting but you can see it. If you need the link let me know. I think they are the same part number. Toyota seems to use the same dimmer in a few vehicles.
     
  12. Mar 1, 2017 at 2:51 PM
    #12
    BlueTACO09

    BlueTACO09 Member

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    Was this issue ever solved? I'm having the same problem with my 09.
     

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