2010 Prius won’t go to READY after radio install – Check Hybrid System + dash lights on

Hi everyone,

I have a 2010 Prius and I’m having a starting issue after attempting a radio installation.

What happened:

I tried installing an aftermarket radio, then later reinstalled the factory radio. During/after the install, I may have accidentally caused an electrical issue or blown a fuse.


⚠️ Current symptoms:

• Dashboard powers on normally
• Multiple warning lights appear
• “Check Hybrid System” message shows
• Car will NOT go into READY mode
• Engine does not start
• Accessories and dash still receive power

What I’ve checked so far:

• Reinstalled original factory radio
• Visually checked a few interior fuses
• Considering checking AM1 / AM2 / ACC fuses next
• Haven’t confirmed 12V battery voltage yet

❓ Questions:

1. Does this sound more like a blown AM2/AM1/ACC fuse or a 12V battery issue?
2. Can a short from a radio install trigger a hybrid system fault like this?
3. If AM2 is blown, would the car still power on like this but refuse READY?
4. Should I reset anything after replacing fuses, or will it clear automatically?

Any guidance would really help — I’m trying to avoid unnecessary part replacement or towing if it’s just a fuse issue.