Prius with ABS VSC (!) and constant buzzer

was it the kind of carwash that required you to put the car in neutral?

 

washing the engine compartment isn't recommended. maybe some time in the sun with the hood open would help.

 

The warning lights and buzzer are on, so this is a straightforward matter of reading the codes from the brake computer to learn what the trouble is, then fixing it. That it happened at the car wash could be mere coincidence, but after knowing what the issues are, it will be easier to say.

If you don't have a suitable code reader, you're in luck, brake codes on a Gen 3 can also be blinked out on the dash lights, all you need is a jumper wire.

There are dozens of possible brake trouble codes, but only about a half dozen of them (IIRC) considered so severe that they trigger the buzzer. So that already narrows the possibilities somewhat. The conditions triggering the buzzer are mostly those to do with failure to reach or maintain the proper assist pressure, which you can tell is a real issue, because you can feel that you don't have brake assist.

So, your car needs something repaired, and it is ready to tell you the details, and then you'll know where to go from there.

-Chap

 

This is gen 2 forum....But recently I had Brake/ABS/VSC on and went to O'Reilleys....plugged scanner in...ran ABS codes...The code was for a rear right ABS sensor.

Bought $80 wheel bearing that included sensor at O'Reilleys (it was very cheap online but I was impatient). Shop charged $75 to put on and problem was resolved. YMMV

 

T3, does that mean you imported it from the UK?

 

In your case, did that right rear ABS sensor code cause the alarm buzzer to go off? Only a small subset of codes are programmed to do that. If it wasn't sounding in your case, that would be a dead giveaway that the OP in this thread is having a different issue reported, to which your case is unrelated.

-Chap

 

had the same happen one of the ABS sensors got water in the connector where it plugs into the back by the wheel hub... .. I removed mine and hit them with a hair dryer.. dried the connector then put electrical tape over it.. been ok since

 

The code shown in this thread is for a wheel cylinder pressure sensor. While it's understandable someone might guess the wheel cylinder pressure sensor is near the wheel cylinder, it's not. It's one component of the ABS actuator assembly under the hood and cowl.

As to why there is a code for that sensor, the various possibilities just have to be sorted through to find the one that applies. The things to check are in the repair manual. Is the alarm still sounding?

-Chap

 

If brake actuator the best bet is to drop off to toyota dealership and have them diagnose. Call first and see if your VIN qualifies for the extended warranty through 10 years / 150K miles.