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B1400 No cold AC on 2004 Prius

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by 3prongpaul, Jun 1, 2014.

3prongpaul Hybrid Shop Owner, worked on 100's of Prius's

Joined:

Jul 18, 2010

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Location:

Boulder Hybids, Boulder, CO

Vehicle:

2006 Prius

Model:

N/A

Thought I share symptoms (and solution) so the next person who encounters this problem can save some time. Customer bought a used 04 Prius, no cold air. No AC error codes other than B1421 (which all Prius have when scanned indoors) and B1400 which I'd never seen before.

I then noticed the MFD doing funky stuff. At random times the ambient temp display would show 23C instead of 73F.

No matter what temp I selected, after car restart the temp setpoint would be 75F
(normally the car remembers your last temp preference)

I evacuated refrigerant and installed correct amount. No cold air.

I decided to change the AC Amplifier (ACU ECU) which is located "above the hump" (actually just above of airbag computer that has yellow connectors).

Anyway, a replacement AC Amplifier solved the MFD problems and restored COLD AIR!

#1 3prongpaul, Jun 1, 2014
Last edited: Jun 1, 2014

TampaPrius.com, bisco, koolingit and 1 other person like this.

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