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  1. Gary Chan
    Post

    2005 Prius – “Check connection to air conditioner” + can’t locate A/C amplifier (HVAC ECU)

    My mfd panel suddenly appears to operate normally now. I believe that its due to increase temperature and less humidity. Although I do not know...
    Post by: Gary Chan, May 23, 2026 in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
  2. Gary Chan
    Post

    2005 Prius – “Check connection to air conditioner” + can’t locate A/C amplifier (HVAC ECU)

    Just ran toyota tech stream software. Air conditioner diagnostic codes are: B1412 ambient temperature sensor circuit. Summary: no Malfunction...
    Post by: Gary Chan, May 16, 2026 in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
  3. Gary Chan
    Post

    2005 Prius – “Check connection to air conditioner” + can’t locate A/C amplifier (HVAC ECU)

    Thank you for your lengthy reply. 1. I tried the ac auto and refresh/circ button press simultaneously while press Power 2x. No code appearing on...
    Post by: Gary Chan, Apr 29, 2026 in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
  4. Gary Chan
    Thread

    2005 Prius – “Check connection to air conditioner” + can’t locate A/C amplifier (HVAC ECU)

    I’m working on a 2005 Prius and getting the “Check connection to air conditioner” message on the MFD. Here’s what I’ve done so far: Checked all...
    Thread by: Gary Chan, Apr 27, 2026, 6 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
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