RickHaleParker wrote: 26 Apr 2021, 09:51
You might want to consider Transient Voltage Suppression ( TVS ). One spike over 45V on the 12V line would fry the MC33290. That Zener diode connected to +Vbat on the first page of the MC33290 Datasheet is TVS.

small update: 2 tvs added(SMA6J30A).
updated gerbers attached.

Added jumper pads and RX to 15 pin:
Gerber attached.
@vtl I can assemble and send spare pcb to if needed OBDII used from ali: Type 1:

vtl wrote: 26 Apr 2021, 04:50 K-Line TX to TX3 (pin 14).

Also this chip is obsolete (out of production), you may want to replace it with mc33290d.

Replaced to 33290d:

vtl wrote: 25 Apr 2021, 08:10

MaxDenisov wrote: 24 Apr 2021, 12:57 @vtl I am working on new pc/hardware design. Please let me know if you are interesting in spare pcb/device

It also need a driver for K-line, for earlier P2s. I used mc33290d connected to serial port 3.

Made a small correction, k-Line added and -> 12- 5V:

vtl wrote: 25 Apr 2021, 08:10

MaxDenisov wrote: 24 Apr 2021, 12:57 @vtl I am working on new pc/hardware design. Please let me know if you are interesting in spare pcb/device

It also need a driver for K-line, for earlier P2s. I used mc33290d connected to serial port 3.

two in one or just separate device/adapter?

@vtl I am working on new pc/hardware design. Please let me know if you are interesting in spare pcb/device

I'm a bit late but had much different things to do and didn't come so far with a normal user "useful" software. My idea was and is to release a windows soft this week, which allows to change the parameters of the car, like having fog lights, having this, having that. Beyond each parameter is one ...

My 2011 XC90 , B5254T2( 2,5AT ) 31314468

T5Luke just saved me from the fridge)
Thank you very much!

Engine working well now

Today I was able to add a brand new remote(part of key) into my XC90 car using the found PIN and Vdash.
Half way passed - I can use the remote for lock and unlock the car now.
I still use a funny Thermapack bag to store my immo key and frozen berries during the day to be able to start the engine ...