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ASTRA F - IMMO OFF - SIMTEC56(.1)
06-03-2024, 22:00 PM,
Post: #1
KOpel  ASTRA F - IMMO OFF - SIMTEC56(.1)
Hi guys,

I wanted to ask if any of you have a tested IMMO OFF solution for an Opel Astra F - Simtec 56(.1) ECU?

I read the data from the 93C56 & NM27C256NE with the Willem Eeprom Programmer and hope that someone can help me.
I'm really not sure whether the immobilizer is stored on the 27256 or on the 93C56.
Unfortunately I can no longer tell whether it is a Simtec56 or Simtec 56.1 ECU.

The 27C256 also doesn't have a round opening in the middle where the UV rays could penetrate, so I delete everything and then write it again. I have the feeling that it can only be extinguished with additional power of 14V. Does anyone have a clue?

I would be really grateful if someone could help me with this.

Thanks in advance!


Attached Files
NM27C256NE_&_93C56_Read_X16_IMMO_ON.rar
File Type: .rar
Downloaded: 5 times
Size: 172.37 KB



Quote this message in a reply
07-03-2024, 06:20 AM, (This post was last modified: 07-03-2024, 06:26 AM by raffy haddad.)
Post: #2
RE: ASTRA F - IMMO OFF - SIMTEC56(.1)
(06-03-2024, 22:00 PM)kennyy Wrote:  Hi guys,

I wanted to ask if any of you have a tested IMMO OFF solution for an Opel Astra F - Simtec 56(.1) ECU?

I read the data from the 93C56 & NM27C256NE with the Willem Eeprom Programmer and hope that someone can help me.
I'm really not sure whether the immobilizer is stored on the 27256 or on the 93C56.
Unfortunately I can no longer tell whether it is a Simtec56 or Simtec 56.1 ECU.

The 27C256 also doesn't have a round opening in the middle where the UV rays could penetrate, so I delete everything and then write it again. I have the feeling that it can only be extinguished with additional power of 14V. Does anyone have a clue?

I would be really grateful if someone could help me with this.

Thanks in advance!
The pic of eep in your folder not erasable 
Need new one write this file and report back
Also in eeprom c56


Attached Files
27c256 off.rar
File Type: .rar
Downloaded: 6 times
Size: 21.83 KB

eep off.rar
File Type: .rar
Downloaded: 4 times
Size: 301 bytes


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[+] 3 users say Thank You to raffy haddad for this post
07-03-2024, 09:24 AM,
Post: #3
RE: ASTRA F - IMMO OFF - SIMTEC56(.1)
raffy haddad dateline='[url=tel:1709792455' Wrote:  1709792455[/url]']
kennyy dateline='[url=tel:1709762416' Wrote:  1709762416[/url]']
Hi guys,

I wanted to ask if any of you have a tested IMMO OFF solution for an Opel Astra F - Simtec 56(.1) ECU?

I read the data from the 93C56 & NM27C256NE with the Willem Eeprom Programmer and hope that someone can help me.
I'm really not sure whether the immobilizer is stored on the 27256 or on the 93C56.
Unfortunately I can no longer tell whether it is a Simtec56 or Simtec 56.1 ECU.

The 27C256 also doesn't have a round opening in the middle where the UV rays could penetrate, so I delete everything and then write it again. I have the feeling that it can only be extinguished with additional power of 14V. Does anyone have a clue?

I would be really grateful if someone could help me with this.

Thanks in advance!
The pic of eep in your folder not erasable 
Need new one write this file and report back
Also in eeprom c56



Thank you my friend!

Do you know where i can order the EEPROM?

I want to buy so fast as i can and report!!


Best Regards


Quote this message in a reply
12-03-2024, 20:58 PM,
Post: #4
RE: ASTRA F - IMMO OFF - SIMTEC56(.1)
(07-03-2024, 09:24 AM)kennyy Wrote:  
raffy haddad dateline='[url=tel:1709792455' Wrote:  1709792455[/url]']
kennyy dateline='[url=tel:1709762416' Wrote:  1709762416[/url]']
Hi guys,

I wanted to ask if any of you have a tested IMMO OFF solution for an Opel Astra F - Simtec 56(.1) ECU?

I read the data from the 93C56 & NM27C256NE with the Willem Eeprom Programmer and hope that someone can help me.
I'm really not sure whether the immobilizer is stored on the 27256 or on the 93C56.
Unfortunately I can no longer tell whether it is a Simtec56 or Simtec 56.1 ECU.

The 27C256 also doesn't have a round opening in the middle where the UV rays could penetrate, so I delete everything and then write it again. I have the feeling that it can only be extinguished with additional power of 14V. Does anyone have a clue?

I would be really grateful if someone could help me with this.

Thanks in advance!
The pic of eep in your folder not erasable 
Need new one write this file and report back
Also in eeprom c56



Thank you my friend!

Do you know where i can order the EEPROM?

I want to buy so fast as i can and report!!


Best Regards

Electronics junkyard , flea market etc. many old electronic boards have them
Quote this message in a reply
[+] 1 user says Thank You to dimitar for this post


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