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A/c light flashing

Discussion in '2nd Gen. Tacomas (2005-2015)' started by MACKT28, Feb 13, 2023.

  1. Feb 13, 2023 at 12:29 PM
    #1
    MACKT28

    MACKT28 [OP] Well-Known Member

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    Heretic Ditch lights Toyo Open Countrys AT2 HI VIS OVERLAND RTT
    Wondering if anyone has experienced the a/c light flashing issue and what was done to correct the fix without going to the dealership.
     
  2. Feb 13, 2023 at 1:56 PM
    #2
    TnShooter

    TnShooter The TacomaWorld Stray

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    winkel likes this.
  3. Feb 13, 2023 at 6:01 PM
    #3
    Dm93

    Dm93 Test Don't Guess

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    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    Does the compressor turn on for a few seconds and then turn off with a flashing A/C light?

    The flashing A/C light is when the A/C amplifier does not detect a speed signal from the compressor lock sensor after commanding the MG CLT relay on.
    Possible causes are:
    Open or shorted wire(s) in the lock sensor circuit
    Bad lock sensor
    Internal problem in the compressor
    Open or shorted wire(s) to the MG CLT relay
    Open in the wire from the MG CLT relay to the compressor
    Failed compressor clutch
    Belt slipping
    Failed A/C amplifier

    You will need to check your wiring
    The MG CLT relay should have power on pins 2 and 5 when the ignition switch is on, the A/C amplifier grounds pin 1 to turn it on.
    You can momentarily jump pins 3 and 5 of the relay to see if the clutch engages.
    Also check the wiring between the lock sensor and A/C amplifier.
    The sensor signal itself can only be effectively checked with an oscilloscope.

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