Need help with changing my ECU

The guy in this video does not say a word (perhaps he doesn't speak English), but the video does show a replacement of the HV battery ECU. You would need to remove the cover over the electronics, but not the cover over the battery pack itself. The video also does not show him removing the orange safety plug and testing for residual voltage across the orange cable connectors while wearing safety gloves, but that is definitely the necessary first step. I hope this helps.

 

To be on the safer side, you got to remove the service plug. You could mistakenly get yourself killed, when attempting to remove the battery ECU.

 

Just curious how much was the new battery?

 

You will need to reattach all of the things that were hooked up to your original battery. Hopefully they are still in the car. I don't think anyone who sells you a battery is going to attach any other electronics unless you make arrangements to buy them as well. You got everything that you would normally get.

 

Everything I've read indicates that if you measure 0 Volts (or close to 0 Volts) across the 2 connectors shown in the attached picture, and do not open the case of the HV battery, you will not get electrocuted. I believe you should keep your safety gloves on until after you've measured 0 Volts across those 2 connectors.

 

You will need to open up bother batteries.
Transfer quite a few parts from old pack to the new pack. Hoses, black separator, computer, contactor, white plastic rectangle, metal end plate, etc.

Then must properly package old pack. Place 2 rubber mats over modules, remove possible and negative cables, orange plug. Bag up orange connections. Label with VIN, miles, etc

 

This is wrong. You must take the cover off of the old battery in order to transfer the necessary parts over to the new unit.

This is the control assembly off of the battery. To get this off of your old pack you need to remove the cover. Remove both of the main cables. Remove the service plug housing and associated cables and finally the ECU. Once you get all of that off there are 3 10mm nuts that hold the control assembly on. Everything goes on the new battery in reverse order.


Hope that helps,
Matt

 

If the dealer installs you should get a 3 year warranty instead of the 1 year warranty if you installed it yourself.

 

My dealer has that install down to 35-40 minutes. 800 is a good money maker with the core charge scare. Love the dealers.

Posted via the PriusChat mobile app.

 

If they are selling you an unassembled Toyota pack that has new cells I would challenge your dealer.

It is impossible to do the job without opening it.
I will gladly put down an $800 bet on that.

I would be willing to call the dealer to advocate on your behalf as well. Contact me at 608-729-4082.

I am also willing to walk you through things as well.

Your profile says Bay Area, is that the San Francisco Bay area?

 

You can return the part and ask for your money back and use a different dealer or possibly from an independent shop.

Especially if you are in the San Francisco Bay area.