Soldat79

Hello guys, in France we have a Lexus Forum, and some times we come in this forum to learn a little bit more about our IS. We have a thread about convert the car to ethanol, but we need to find the ECU/ECM number. Because we know there is a lot of different number ECU for the LEXUS IS between 2013 and 2016. Do you know how we can find this number ?

Edit (thanks Sasnuke) 12/01/2021

89661-53R70 is an Engine Computer part number for an IS300h (02-2015 to 08-2015).
89661-53S30 is an Engine Computer part number for an IS300h (08-2015 to 10-2016).
89661-53N50 is an Engine Computer part number for an IS250.


89661-53P80 (04-2013 to 07-2014)
89661-53P70 (04-2013 to 02-2015)
89661-53P60 (04-2013 to 08-2015)
89661-53P90 (04-2013 to 08-2015)
89661-53S10 (08-2015 to 10-2016)
89661-53R70 (02-2015 to 08-2015)
89661-53S30 (08-2015 to 10-2016)
89661-53S40 (08-2015 to 10-2016)
89661-53S50 (08-2015 to 10-2016)


Update, the ECU/ECM part Number is write on the ECU/ECM:

Sasnuke

If you provide the dealer the VIN they can tell you the part number for the ECU.
If you don't/can't ask the dealer, then the absolutely most reliable way is to the remove the ECU.
The ECU will have a parts label on it with the ECU part number, then you will know what the ECU is for your vehicle 100%.
You could start a thread on that forum cataloging the ECU's per year and what model they belong to...I'm not sure how many different models of IS per year you have.

Soldat79

Exactly my dealer told me he found my ECU part Number with the VIN and it is 53S30 (it s the case for all AVE30 to 2015 August to 2016 october), but a engine engineer is connected to my OBD car three month ago and told me my ECU number is 53N50

I would like to read directly on my ECU car, but I'm a afraid to create an issue !!!

If there is guys who know their own ECU part number I can edit the first one to add each ECU per period.

Sasnuke

89661-53P70 is an Engine Computer part number for an IS300h (04-2013 to 02-2015).
89661-53R70 is an Engine Computer part number for an IS300h (02-2015 to 08-2015).
89661-53S30 is an Engine Computer part number for an IS300h (08-2015 to 10-2016).
89661-53N50 is an Engine Computer part number for an IS250.

I'm gonna say the dealer was correct.

NOTE: These are only some of the available Engine Computer part numbers. There are still several more depending on year and vehicle trim level.

Soldat79

A big thank Sasnuke, I will share it on the french Forum and today I m going to check directly on my ECU car.

Sasnuke

Here is a more complete list.

89661-53P80 (04-2013 to 07-2014)
89661-53P70 (04-2013 to 02-2015)
89661-53P60 (04-2013 to 08-2015)
89661-53P90 (04-2013 to 08-2015)
89661-53S10 (08-2015 to 10-2016)
89661-53R70 (02-2015 to 08-2015)
89661-53S30 (08-2015 to 10-2016)
89661-53S40 (08-2015 to 10-2016)
89661-53S50 (08-2015 to 10-2016)

The list above includes various countries in the Eastern hemisphere and various trim levels.
Likely not all the computer part numbers will be found in France.

Soldat79

Thanks Sasnuke. I had this list to the first post .

Do you know how I can find which model is link at each ECU

Sasnuke

That might be a little tough to find which model is linked to which computer.
In Canada where I am we refer to the IS trim levels differently that in the USA.
So I can only imagine in France they may even have a different way of referring to the trim levels of each model than the USA and Canada.

You may need to have the France forum members check which computer number they have and then post what model they have...that might be the only way to link them together.

Soldat79

Ok , I get it. We will check on us ECU.

Or you agree it's not necessary to unplug the battery or anythings else for unplug the ECU to check the ID part.

Sasnuke

It's really depends how the ECU is situated in the vehicle.
It may be possible to see the label with the part number without disconnecting the battery or ECU.
Unfortunately I've never seen an IS300h in person, so I have no idea how the ECU is positioned in the car.
I would say try to take apart as least as possible to access the label with the part number...try to keep it simple.

Soldat79

Here is.




i can t see directly without unlplug, I already tried.

Sasnuke

In that case I would say only disconnect the 12V battery and unplug the ECU.
I wonder if the bracket holding it could be unbolted and just lift the entire ECU upwards far enough to read the label.

Soldat79

I m going to try that or else I will disconnect the 12 V battery, not the 228V battery

Soldat79

It's confirmed like the first post said. Lexus IS300H 10/2016 is 53S30.