Problem dash is completely dead and Ignition switch no lights

edthefox5 · Jan 10, 2023

Seen this before. You have to take out every single fuse in the cabin fuse box and and the black fuse box under the hood and check them all one by one with an ohmmeter to see if filament intact. Pray you find a bad fuse.

stuffyloaf14 · Apr 16, 2024

Tom600x said: ↑

I have a 2009 Toyota Prius problem is the car will not start up and the dash is completely out, this occurred after I unplugged and plugged in the aux battery when I was clearing a previous code. The only thing that lights up on the dash are the hazard lights and the door open indicator. Also if the key fob is not in or near the car when pressing the ignition (on switch) it will display the missing key indicator so this tells me that the on switch is doing something. I also tried each keyfob near and in the slot.

I have had a bad or weak aux battery in the past and this is not the same. The aux battery is charged and I am getting +12 volts at the fuse panel. I checked the AM2 fuse and that also has power as well as the fusible link. I also checked power at the fuses under the drivers side and the Gauge fuse has power. I checked I believe all fuses for continuity, most in and out of the car.

I have the Toyota tech software but can not get it or another code reader to read any thing.

I have also unplugged and plugged in the main battery and aux battery after letting it unplugged for a few days.

The key fobs seem to work since they do open the doors and the lights flash.

The ignition swtich / on button and dash do not light up at all no circle of green or orange, nothing.

Before the dash issue I was able to read codes with the toyota software and another code reader.

Any help is appreciated I tried a lot of information on this forum and elsewhere. I do not believe it is the same as other dash issues since others say their car works even thou the dash is out.

Thanks for any help on this.
Click to expand...

Hey man did you ever find out what was wrong? I'm having very similar symptoms anything helps right now

cesar morales · Aug 30, 2025 at 3:26 PM

Tom600x said: ↑

I have a 2009 Toyota Prius problem is the car will not start up and the dash is completely out, this occurred after I unplugged and plugged in the aux battery when I was clearing a previous code. The only thing that lights up on the dash are the hazard lights and the door open indicator. Also if the key fob is not in or near the car when pressing the ignition (on switch) it will display the missing key indicator so this tells me that the on switch is doing something. I also tried each keyfob near and in the slot.

I have had a bad or weak aux battery in the past and this is not the same. The aux battery is charged and I am getting +12 volts at the fuse panel. I checked the AM2 fuse and that also has power as well as the fusible link. I also checked power at the fuses under the drivers side and the Gauge fuse has power. I checked I believe all fuses for continuity, most in and out of the car.

I have the Toyota tech software but can not get it or another code reader to read any thing.

I have also unplugged and plugged in the main battery and aux battery after letting it unplugged for a few days.

The key fobs seem to work since they do open the doors and the lights flash.

The ignition swtich / on button and dash do not light up at all no circle of green or orange, nothing.

Before the dash issue I was able to read codes with the toyota software and another code reader.

Any help is appreciated I tried a lot of information on this forum and elsewhere. I do not believe it is the same as other dash issues since others say their car works even thou the dash is out.

Thanks for any help on this.
Click to expand...

did you solve this issue im having same issue in my 08 prius 2 gen

bisco · Aug 30, 2025 at 9:02 PM

i think it was a fuse, or the inverter pump

Problem dash is completely dead and Ignition switch no lights

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Problem dash is completely dead and Ignition switch no lights

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