Dashboard illuminated with too many warning lights

Try another code reader. There are codes. Without knowing them, we can't help.

 

Get Mini VCI to read the diagnostic trouble codes.

 

MiniVCI is best of if you have a 32bit WinOS to install it on (XP or Win7).

There are tons of cheap ($12) bluetooth OBD readers and Torque Pro for Android ($6).

There are wifi readers and equivalent iphone apps for a little more $.

 

Replace the high voltage traction battery.

 

Replace the 12 volt battery also - you would save time by starting with new batteries

 

It all depends how much you paid for the car. If you got it for cheap then great, just drop a used or new battery in it and drive her away...

 

Depends how many miles. High mile hybrid batteries can be bought for as little as three hundred bucks. As far as a do it yourself job, it's definitely doable. it's easy to access and a clean job compared to working in an engine compartment. There is a really good you-tube video on how change it out...

gen 2 used hybrid battery prius | eBay

 

I've heard that replacing cells is pretty much hit and miss. There's some threads here about it, some guys have had good luck, many others not so much...

Also make sure you clean the hybrid battery cooling fan while your at it.

 

Yes - the traction battery which resides under the back seat. Check out Youtube on a host of many repairs related to the battery and aquaint yourself. Seeing the various videos will aquaint you with the dry run so as not to psych yourself out. Many have done it - so can you.
Just take time to review the cautionary procedures so as not to electricute yourself. The Toy engineers have designed this to be as humanly fool proof as possible but as always - its possible to take a shortcut which would put yourself in peril.

 

I would use a power drill with socket adapter, it would take at least 4x as long doing it with socket wrench.

 

Yes, but before that you should use your scanner to getting reading of all of the blocks so you have a good idea of how many cells you may be dealing with.

Also using the scanner, what is the SOC ( State of Charge %)? Try to do a forced Discharge and then a Charge to a minimum of 70%

Take a pic of the discharged and charged state or better yet record it on the scanner or TIS

If you are going to tackle this but a New Bus Bar with sensors. The back bus bar can be cleaned up and re-used.

 

suggest you do some research here on battery threads. this stuff isn't for amateurs, the hybrid battery can KILL you.

 

^^^+1

You MUST read allot and watch allot of videos to absolutely insure you do not injure yourself or worse. SAFETY FIRST. Any doubts, Don't Do It! Never Ever cause the two leads (+/-) to make an errand/unintentional connection i.e. wire brushing or metal tool connection or ou for that matter.

Yes, the Bus Bars are the strips that connect the cell leads together to create the high HV battery voltage ergo the DANGER


from a G1.

1. Forced discharge: E-brake, wheel chocks, put in REVERSE and press the accelerator completely down until SOC drops below 30%
2. Then immediately place in Drive, press pedal all the way down ( ICE should start ) until SOC goes to a minimum of 70%
3. Then place in Park and let the car normalize and once ICE stops, leave car on to allow the fans to cool the battery down before shut off. You will hear the fans slow down.

I suggest lowering the windows and insure air intake for the cooling fans are not obstructed in anyway.

Please do a search to insure I have not missed a step. Yon can charge first then discharge if you wish but you must allow the fans to do a cool down cycle after this forced event.