Prius Prime – A/C Not Working, B1476 Code, Constant Sound Under Hatch

Hi everyone,


I have a 2019–2020 Toyota Prius Prime (ZR-FXE) and I’m currently experiencing an issue with the air conditioning system.



Symptoms:

• Air conditioner doesn’t start at all. No cooling.
• Freon is fully charged – verified by technician.
• There is a constant electrical or humming sound coming from under the rear hatch area – even when the A/C is off.
• The A/C compressor does not engage.

Diagnostic Results:



Ran a scan with a professional tool and got the following codes:

• B1476 A/C Inverter Load System – Current
• B1476 A/C Inverter Load System – History

Other systems like hybrid control, HV battery, radar, etc., all show “Normal.”



My Questions:

1. Has anyone dealt with this B1476 code before?
2. Could this be caused by a blown fuse or relay, and if so – where is the A/C inverter or compressor fuse located in the Prius Prime?
3. Does anyone have a wiring diagram or fuse layout for the A/C system or compressor?
4. What could be causing that constant sound under the hatch – is it related to the HV system or cooling inverter?

Any advice or guidance would be hugely appreciated! I want to avoid replacing the A/C compressor or inverter without being sure.


Thanks in advance!