Decoding cim

[Mark I]

Hi guys,
I've been working through decoding the various modules on the astra im using a upa-usb but im now stuck on a cim with the mcu Motarola MC9S12DG128 112pin. ive soldered on to the pcb close to pins 23, 40 and 41, I've lifted the reset pin 42 but when I try to read all I get is "device not respond" I have cheked with the upa voltmeter and with one of my own, Vdd is 4.75v, Vss is 0v.
Any ideas welcome.

Regards Mark

[domtorredo]

Thats a preface vectra cim?

[domtorredo]

Some of these mcu are tricky and most of time they need to be removed completely to read.

[Mark I]

It's from an astra. I really was hoping you wouldn,t say that.

[domtorredo]

Eh but i must say it, had early vectra cim with key recognising problem mcu was only working when it was heated up with heat gun and guess it was motorolla

[domtorredo]

If you want to work with loads of mcu's i advise u getting IR heater with preaheater and for soldering use solder paste

[Mark I]

Thanks for the info, i'll take it off at the weekend and give it a try.

[domtorredo]

Well hope you will get it working and be aware that they can be encrypted and u dont see what you expect, for astra in cim look for keys and pins as 2nd keys can be got working on astra manualy placing them dump

[domtorredo]

Any results ?

[sarah1331]

7cc-7cd in mcu I believe eeprom is 658 but is encrypted and If I put algo here it would not be fair on Richard so wont