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A/C Electrical Helppppp!!!! Tried it all already

Discussion in '2nd Gen. Tacomas (2005-2015)' started by JGon, May 20, 2020.

  1. May 20, 2020 at 11:19 AM
    #1
    JGon

    JGon [OP] New Member

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    Hey Guys and Gals, I hope you're having a kickass day so far!!

    I am looking for help and maybe I overlooked something. I want to say I have tested and replaced it all.

    I have a 2007 Toyota Tacoma 150K. One day the A/C stopped blowing, just went out while driving. Now prior to all this happening, I did have the typical A/C issues with the Blower motor resistor going out and the connector showing signs of burnt pins. I replaced both connector and resistor, Worked fine for another couple of months.

    Now the fan does not blow, on any setting. I took it to the dealer and the have misdiagnosed the problem twice. I was told it was the relays and fuses and need a new fan motor. I replaced them and still not working. I was then told It was a bad control panel unit so I replace that also and It is still not working. I was looking over the electrical schematic and everything works with the A/C amplifier, So I replaced that too and still nothing. I don't know what else to check. It is an electrical problem. When I turn the A/C on you can hear the engine side components engage and the engine RPM goes up a bit. So I know It is, not the Compressor or engine components that are Bad.

    Parts Replaced:
    A/C - Fuses and Relays under Hood
    Blower Motor
    A/C Control Panel
    A/C amplifier
     
  2. May 20, 2020 at 11:25 AM
    #2
    MR5X5

    MR5X5 Member

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    Get a multi meter and a circuit diagram and start working backwards from the fan until you find where the voltage is not being passed.
     
  3. May 20, 2020 at 11:31 AM
    #3
    IL Capo

    IL Capo Well-Known Member

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    Sorry to hear about your AC problems.....I would have to agree. You will need to work backwards from the fan unit. I'm assuming someone check the fan unit to ensure it still works....good luck & keep us posted.
     
  4. May 20, 2020 at 11:37 AM
    #4
    Jimmyh

    Jimmyh Well-Known Member

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    Did you look at the two wire connector that plugs into the motor itself? It is also subject to burning.

    Here are the prints for the Blower and AC Circuit.

    If you look you can see that the Blower motor should have AC power (12 VDC) on the Black wire with a Yellow Stripe when the blower is turned on any speed when the heater relay is energized.

    Where I would start is start the truck and turn on the blower ( any speed ) and check for voltage at the Black wire with a Yellow Stripe. If you have 12 VDC at that wire then you know everything is working up to that point.

    If you don't then you could have a blown IG1 NO2 Fuse. Check it with a meter don't depend on your eyes. You can't always tell a blown fuse. Also the ground wire for the heater Relay Coil is the yellow wire # 2 that goes through the AC Controller for a ground connection.

    If you are getting 12 VDC and the blower still isn't running, then what you can do is to connect the white wire with a lavender stripe with a temporary wire to a good ground. If the blower runs (warning it will be full speed as the resistor will be bypassed). If the blower runs then you know the blower is working.

    Now we are down to either the resistor or the ground wiring... All I can say here is to go through the circuit with a meter to check for broken or loose connections.


     
    Last edited: May 20, 2020
    06Tacooo, TnShooter and JGon [OP] like this.
  5. May 20, 2020 at 12:03 PM
    #5
    JGon

    JGon [OP] New Member

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    This is awesome and great info brother, Thank you. I have put a meter all over the place, but I will recheck these circuit and connectors. Also I don't know if this can be a clue of some kind. When the A/C went out so did the headlights. They only worked on Highbeams, The dealer replaced the relays and that started working again. I am going to use these prints and recheck it all. Thank you
     
  6. May 20, 2020 at 12:17 PM
    #6
    Larzzzz

    Larzzzz Grande' Ricardo

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    Aux back up lights, Bed lights, Re-located trailer plug, Good dooby, a.k.a. jumper cable mod, Heated seats, back up camera,
    If it's low on refrigerant, it won't turn on either. There's a pressure switch on one of the lines. Unplug it and check ohms on the switch. It should be closed, 0 ohms. If not, it's either a bad switch or no chilly juice in the system.

    You can also jump out the connector and see if it turns on. I wouldn't leave it running though until pressures are checked in the system. You just want to see the compressor spin.
     
    12TRDTacoma likes this.
  7. May 20, 2020 at 12:20 PM
    #7
    Jimmyh

    Jimmyh Well-Known Member

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    From the original post:

    "When I turn the A/C on you can hear the engine side components engage and the engine RPM goes up a bit."

    From his post I understood that the blower isn't working.
     
    Philrab likes this.
  8. May 20, 2020 at 1:02 PM
    #8
    Larzzzz

    Larzzzz Grande' Ricardo

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    Aux back up lights, Bed lights, Re-located trailer plug, Good dooby, a.k.a. jumper cable mod, Heated seats, back up camera,
    Ummmmmmmm, ya.

    I got nothing.

    I'll see myself out now....

    :anonymous:
     
    Jimmyh likes this.
  9. May 21, 2020 at 6:55 PM
    #9
    Jimmyh

    Jimmyh Well-Known Member

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    No need to wear a bag! LOL

    It's all good.
     
    Larzzzz likes this.
  10. May 23, 2020 at 8:52 AM
    #10
    Jimmyh

    Jimmyh Well-Known Member

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    Any updates?
     
  11. May 23, 2020 at 9:55 AM
    #11
    Philrab

    Philrab Well-Known Member

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    Bunch of Basic Taco mods.
    No easy answers with an electrical fault. Grab the multimeter, check every connection for power and ground, take nothing for granted, don’t assume even a brand new part is properly functioning.

    I’d even considering running a jumper wire to the blower motor to make good and sure it works installed, just so you aren’t chasing your own tail.
     
  12. May 23, 2020 at 11:15 AM
    #12
    Zersko

    Zersko Well-Known Member

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    What happens if you slam the glove box with the setting on high?
     

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