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Vida CEM swapping

A mid-size luxury crossover SUV, the Volvo XC90 made its debut in 2002 at the Detroit Motor Show. Recognized for its safety, practicality, and comfort, the XC90 is a popular vehicle around the world. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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ZRimaZ
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Re: Vida CEM swapping

Post by ZRimaZ »

matija0610 wrote: 06 Dec 2021, 11:28 i'm looking at .bin i read last week ..
is it possible that pin is 0 0 0 0 0 0?
i'm not sure if anyone touched CEM before me.
and I'm not sure if I'm at the right address 0x6000?


Screenshot_1.png
Is it "brick" cem before 2004? If yes, thoose cem have pin at 2 different addresses- just before 0x6000 or before 0x4000, so look for another location
Have a nice day,

ZRimaZ

matija0610
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Post by matija0610 »

yes, 2000 brick CEM
on 0x4000 and very around 0x4000 only FF

does it make sense to try teensy on this CEM?
I know it still doesn't work on this variant of CEM, but I want to participate in the development, does it make sense for me if the PIN is all 0?

ZRimaZ
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Post by ZRimaZ »

matija0610 wrote: 06 Dec 2021, 12:00 yes, 2000 brick CEM
on 0x4000 and very around 0x4000 only FF

does it make sense to try teensy on this CEM?
I know it still doesn't work on this variant of CEM, but I want to participate in the development, does it make sense for me if the PIN is all 0?
PIN for cem-b is located at 0x5ff0 or 0x3ff0.

Edit:

Sorry, my mistake: For CEM-B PIN is located at 0x4000 or 0x6000:
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2021-12-07_141637.jpg
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Last edited by ZRimaZ on 07 Dec 2021, 05:14, edited 1 time in total.
Have a nice day,

ZRimaZ

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RickHaleParker
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Post by RickHaleParker »

RickHaleParker wrote: 05 Dec 2021, 19:20 I have 30+ ( V-Battery ) to E:3 & E:6. E:1 is grounded, no current draw.

Tired applying 30+ to the Ignition switch pins B:1 ( S ), B:2 ( X ) & B:3 ( 15 ) and still no current draw.
Tried this again and it came to life when I connected B:3 ( 15 ). Drawing ~100 mA and I can hear a internal relay power up when I connect B:3 ( 15 ) Key on. Looks like the CEM-B needs the key on unlike the L & H which is always alive to some extent.

The CEM-B has been in storage ... perhaps it was comatose. :wink:
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matija0610
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Post by matija0610 »

ZRimaZ wrote: 06 Dec 2021, 12:08

PIN for cem-b is located at 0x5ff0 or 0x3ff0.

Edit:

Sorry, my mistake: For CEM-B PIN is located at 0x4000 or 0x6000:
this is my CEM:
Screenshot_4.png
Screenshot_4.png (10.59 KiB) Viewed 230 times
Screenshot_5.png
Screenshot_5.png (6.56 KiB) Viewed 230 times
I don't know why I have 0?
a friend sends me another CEM, I'll try with him. For this one I’m not sure if anyone messed up before me.

vtl
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Post by vtl »

I can email you my dump (flash chip was blown off and read in a programmer), it has the pin at ~0x6000.
05 XC70, 19 Tundra, 22 Sequoia, 16 XC60 (sold), 05 XC70 (crashed), 02 V70 (sold)
P1+P2+P3 CEM PIN-code retrieval DIY thread

ZRimaZ
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Post by ZRimaZ »

matija0610 wrote: 07 Dec 2021, 10:37
this is my CEM:

Screenshot_4.png


Screenshot_5.png

I don't know why I have 0?
a friend sends me another CEM, I'll try with him. For this one I’m not sure if anyone messed up before me.
Strange... To be honest, I never checked what pin is in cem. And I have tons of read cems, so if you need some, I can manage to share it with you. Also - cem-l, cem-h and p3 cems...
Have a nice day,

ZRimaZ

matija0610
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Post by matija0610 »

is it possible that for some markets they did not put a pin?
i picked up a couple .bin's from the internet, they all have a pin at 0x6000.

i wanted to test tensy on this CEM but i don't know if it makes sense when pin 0, and old CEM-B is a hard nut to crack anyway?

on point:
What do we need to have, what do we need to know, to change the configuration block via OBD?
1. PIN
2. R/W flash (Dice?)
3. Config parameter
4. ...
check list?

ZRimaZ
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Post by ZRimaZ »

To answer to your question before and now, whether is cem-b worth wasting the time trying to crack it.. My opinion is - not worth. Because of very simple reason - every day it is less and less thoose volvo before 2005...
Have a nice day,

ZRimaZ

matija0610
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Post by matija0610 »

yes, you are totally right. I agree

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