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All 4 warning lights came on yesterday when started car 2007 Prius with 125K miles. Brakes working but grabbing with added pedal pressure. Need help on how to diagnose.
 

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Did the lights turn off, and did the problem happen again the next time you turned on you car? Might be a 12v battery problem. In any case, you should get it checked out as that is a safety issue with the brakes.
 

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Get the codes and post them here to help diagnose the problem. If those warning lights stay on DO NOT DRIVE THE CAR!
 

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Lots of unusual problems can pop up when the 12-volt battery goes bad and the voltage drops to 10.5-11 volts or lower. Before spending time and money troubleshooting these problems, if you still have the original 12-volt battery, you might want to check it to verify that the battery is OK. If the voltage is low, most auto parts stores will charge and load test it for free (because they want to sell you a new battery).

I have purchased a couple of batteries from eLearnAid:

http://www.elearnaid.com/priusparts.html

Bernie Littman is very helpful, and his prices are competitive for hard to find Optima batteries.

Otherwise, most auto parts stores will also read the fail codes for free; and those codes will help others on this site to provide more accurate troubleshooting advice.

Good luck!
 

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1) R&R 12V battery
2) Check if there is any damaged harnesses.
We have pack rats (yes rats) in Tucson that love to chew on cable insulation. I had an Honda Element that had to be towed and a $300 repair due to this.

If not fixed then get the dealer to test the hybrid battery.
 

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Brake, (!), ABS, VSC Lights Warning Lights Popped On

Almost home when 4 warning lights (Brake, (!), ABS, VSC) came on Friday after driving about 45 minutes from work (around 13-15 miles). 2006 Prius with 133K miles. Brakes working. Found this forum and took car to garage next day. 12 volt battery replaced (garage owner said it was a Toyota brand, could have been the original). No problems driving until today, same symptoms, lights came on again while driving home from work, this time farther from home. If it's not the 12v battery, what else could it be? Will be taking it back to the garage first thing in the morning.
 

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This could be your Brake Actuator going out. Take it into the deal IMMEDIATELY. My brakes were making a BARKING noise, and I could hear a motor or something cycling on and off every 5 seconds or so. Then all those lights went on!

Turns out that in my 06 that part is under warranty until Dec 31, 2017!! Yeah you read that right, NEXT December. It's a known bad part.

When they look it up, have them look up the ORIGINAL warranty, not the secondary warranty. It's a $2300 repair, you don't want to have to fork that over if you don't need to.

If your actuator goes out, you will lose your brakes (it could happen while you're driving).
 

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Thanks

This could be your Brake Actuator going out. Take it into the deal IMMEDIATELY. My brakes were making a BARKING noise, and I could hear a motor or something cycling on and off every 5 seconds or so. Then all those lights went on!

Turns out that in my 06 that part is under warranty until Dec 31, 2017!! Yeah you read that right, NEXT December. It's a known bad part.

When they look it up, have them look up the ORIGINAL warranty, not the secondary warranty. It's a $2300 repair, you don't want to have to fork that over if you don't need to.

If your actuator goes out, you will lose your brakes (it could happen while you're driving).
I just want to say thanks to the forum for info about the actuary. Three weeks after paying cash for a 12 year old Prius (2005) my entire dash lit up like a Christmas tree. I was able to tell the dealership that I was under an extended warranty for the break actuary. They made the repair and gave me a rental for 1 week all at no charge. Unfortunately, I'm back to the forums because all my lights have gone off again. I'm hoping it is a bad replacement part...time will tell!
 

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How did it go? Also have the problem with the three yellow symbols, but only when going faster than 113 km/h.
A few months ago it was when going faster than 128 km/h.
 

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Hello cptjames,

I faced the same issue like yours. I have my Prius 2006 Half Full, checked by specialized garage . They detected with their computer analysis on the car, it shows as per screen.
2327


Next day, I started the engine again, it alerts "Brake, (!), ABS, VSC Lights Warning Lights Popped On" again. I went to another garage, and have its original battery Voltage replaced. I ride for one day, the alerts "Brake, (!), ABS, VSC Lights Warning Lights Popped On" disappeared.

Today, it alerts "Brake, (!), ABS, VSC Lights Warning Lights Popped On" again with new battery.

Any suggestion, Prius fan.!!! Please.!!!


Brake, (!), ABS, VSC Lights Warning Lights Popped On

Almost home when 4 warning lights (Brake, (!), ABS, VSC) came on Friday after driving about 45 minutes from work (around 13-15 miles). 2006 Prius with 133K miles. Brakes working. Found this forum and took car to garage next day. 12 volt battery replaced (garage owner said it was a Toyota brand, could have been the original). No problems driving until today, same symptoms, lights came on again while driving home from work, this time farther from home. If it's not the 12v battery, what else could it be? Will be taking it back to the garage first thing in the morning.
 
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