Problem dash is completely dead and Ignition switch no lights

Besides the checks you did on the positive side I would check the ground starting with the ground strap. If you use your voltmeter with negative probe on 12v negative pole and the positive probe on the chassis do you get any voltage? What about between engine block and chassis?

Do you hear the brake actuator when you open your door? Test also voltage between actuator ground and chassis. Any voltage?

Just to make sure I would connect a jumper cable between the negative battery post and the engine or chassis to create additional grounding ( reduce resistance) and try if dash lights and modules work.

 

Don’t bother measuring anything at the battery.

It only matters what the voltage is at the front jump point. That where the car sees the 12 volts. Measuring at the front jump point checks 8 battery connections and a long heavy duty cable before it hits the fuse box

If voltage there is bad then you can go into full search and destroy on the battery in the hatch.

 

The next step would be to then check all the fuses with an ohmmeter if you didn't do that when you did it the first time.

 

I sense that there might be more to this story. What code were you clearing when this saga began? Did you perhaps leave something unplugged while troubleshooting that code?

 

I have the exact same issue. Happened to me this morning whilst driving at about 60kmh, everything in the car just died, no assisted steering or brakes, dash went totally black, etc. Now key is unresponsive, power button does nothing, all I can do is lock/unlock it with the key fob.

Did you end up working it out?

 

Your Inverter cooling water pump has probably burned up, blowing the AM2 fuse in the underhood fusebox. fairly common failure in the Gen 2. Remove the pump from the electrical circuit by unplugging it at the connector shown in the photo, then replace the 15 amp fuse. Drive carefully. Get pump replaced asap.

 

It was my AM2 fuse dead, unplugged WP and seems to be working, however I still cant move the car or get it into "Ready" mode.
I've seen other members that have a dead WP and were still able to drive their car?

 

I had this problem, too. I would enter the car....hit the power button with my fob in my pocket - as normal, and the dash lights were all blank....a black screen. I would open the drivers door and slam it...snd somehow, the power button engaged, but my clock would always have to be reset and my radio stations had to be reprogrammed. I had replaced the 12 volt battery a month earlier, so it could not have been the battery....I checked the terminals on the battery figuring I had a rusty ground and needed to clean that up or a loose terminal. It had to be a battery problem! I pulled the red cap off the plus after seeing that the ground wire was secure...and the post it was attached to on the battery, When IK lifted the red cap, the terminal came off the post with the cap! So, it turned out that the new battery had a thinner post than the Prius battery and the lock -in 10 mm nut would tighten...but I could still wiggle the terminal. So, I loosened the terminal nut and got a small stainless screw and screwed it in between the post and terminal at the junction of the tightening nut and post.....screwed it in to take up that slack and tightened the post nut securely. This time...the positive terminal was tight and secure...reset the clock reprogrammed the radio stations....no problems since. JT

 

I have same problem no ignition no dash just central locking brake lights and hazards checked every fuse am2 fuse good with power to it battery is good fully charged power to under bonnet fuse box checked big aluminium fuse in fuse box good but nothing been trying for days

 

I have same problem did u fix

 

Does the clock turn on when you push the power button? What you describe COULD be the result of a bad capacitor in the Combination Meter (speedometer - dash cluster) assembly. There's a sticky thread near the top of the Gen2 Care & Maintenance forum - I think it's the 4th one down.

Posted via the PriusChat mobile app.

 

The power button does nothing at all not a thing no dash no square centre display am2 fuse perfect every fuse good perfect battery good power to jump point under bonnet brake lights work lights work hazards work nothing through ignition no live at several fuses fuse bpx drivers side rhd car uk.it i give live feed to certain fuses dash lights up but cant get in neutral or power button not lit up.if i give power to cigarette lighter the centre square display lights up all working but no power to on switch

 

Did you check the fuses under the instrument panel? In our 2007, fuse #s 14 & 22 power the hybrid system. There could be other possibilities in there.

 

Hi did u ever find the problem

 

I am having a similar problem. Did you ever find a solution?