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Troubleshooting & Technical Questions & ModificationsHave technical or modification questions about the Crossfire?
Find out the answer, or give advice in here!
Is the EEPROM Chip serial programmable or parallel?
The EEPROM of my module is serial (I2C its an 24LC256) and the EEPROM of the PCM is serial too (SPI its an ST95P08) the EEPROM of the Skreem I think is serial too ist similar to the ST95P08 but I don't recognize the item Number now.
Here the second prototype on breadboard. Now I have to construct and print a case for the board and the display, then everything can be tested in the Crossfire.
Do you anticipate that what you've come up will be a generic skreem that will start any car, manual or automatic, or will it have to be programed by VIN.
Here the second prototype on breadboard. Now I have to construct and print a case for the board and the display, then everything can be tested in the Crossfire.
You are too clever for me, I do not understand any of it.
65,535 starts, so if I keep it at 20 starts a week, I should be good for 63 years, sweet, makes me feel better
I wish there was a cost effecient way to get rid of skreem, and all security.
keys just need cut and no rfid.
if I want to unlock doors, a separate stand alone system.
If I want a alarm, another separate system.
Ecu only has one job, make the car run, cruise control and gauges, as almost a stand alone system.
LEDs issues, less problems, more reliable.
I hope this one day can be a very cost effective way to fix this dreaded issue. Be really nice to be a few $ hundred dollar fix so we can drive our cars till our engines drops out , esp for those of us on fixed incomes. With sub par Crossfires .
Thanks so much for this new possible forever fix to a long dreaded problem. Guess cars built after 1996 were never ment to be upcoming classics. Cause unless you have a degree from M. I .T . Your lost . Long gone are the days to fix ones own car or tinker with it. I know some things but when it comes to computer systems forget it. Since I'm soon to be 61 yrs old many of us at this age are lost when it comes to this stuff. I know I am !!😱😱 . Wishing you best of luck in your new possible forever fix for Crossfires and older Mercedes that are plagued with this horrible over kill security . I would rip it all out if I could !! 😄😄
Here the second prototype on breadboard. Now I have to construct and print a case for the board and the display, then everything can be tested in the Crossfire. .
my fingers are crossed all works better than expected.
are you trying to make it a plug and play, or additional coding tonget our cars in sequence with you new module ?
TY
Do you anticipate that what you've come up will be a generic skreem that will start any car, manual or automatic, or will it have to be programed by VIN.
Yes my goal is to make a generic skreem, so the problem with the not available key fobs were be also solved. I thing I will go a way to unlock the car with RIFD or NFC Tags. If your skreem already works, you can read out from that 4000 codes (if your skreem has already so much) my module will make with a trick 8000 codes of them. No PCM programming necessary. You can repeat this so long until your skreem has no more codes.
If your skreem is broken you became from me 8000 codes but your PCM had to be programmed that it will work with this codes. If you have used all 8000 codes you will have two options:
First: Buy an other EEPROM from me with 8000 codes (or buy it at one with my Skreemulator).
Second: Reprogram your PCM and reset my SKreemulator, than you can use the 8000 codes again. This can be repeated infinitely.
Originally Posted by Speedy4x4
my fingers are crossed all works better than expected.
are you trying to make it a plug and play, or additional coding tonget our cars in sequence with you new module ?
TY
I try to make it as much plug and play as possible. For your other question see above.
Last edited by Viper-666; Jan 27, 2020 at 01:44 PM.
Yes my goal is to make a generic skreem, so the problem with the not available key fobs were be also solved. I thing I will go a way to unlock the car with RIFD or NFC Tags. If your skreem already works, you can read out from that 4000 codes (if your skreem has already so much) my module will make with a trick 8000 codes of them. No PCM programming necessary. You can repeat this so long until your skreem has no more codes.
If your skreem is broken you became from me 8000 codes but your PCM had to be programmed that it will work with this codes. If you have used all 8000 codes you will have two options:
First: Buy an other EEPROM from me with 8000 codes (or buy it at one with my Skreemulator).
Second: Reprogram your PCM and reset my SKreemulator, than you can use the 8000 codes again. This can be repeated infinitely.
I try to make it as much plug and play as possible. For your other question see above.
I think that many failed SKREEMs are the result of a simple component failure. We have power seat modules failing because of a failed 10 cent diode or poor soldering and there are more components in the SKREEM.
It is not in the financial interest of those reprogramming failed modules to say that a particular SKREEM failed because of some component so replacing it with one from the wrecker and reprogramming it makes sense, because when told that a particular module cannot be reprogrammed the owner may opt for a new one.
Finding a component fault within the module takes a lot of time unless you have an idea where to look.
Last edited by onehundred80; Jan 27, 2020 at 02:05 PM.
Although I don't have a SKREEM problem and do not think I will get one, maybe the focus should be on BYPASSING the module and related codes, so that repeated SKREEM problems will be a thing of the past. I think I read some have had repeated failures, so a bypass one time purchase would be beneficial to everyone (one time and done).
Although I don't have a SKREEM problem and do not think I will get one, maybe the focus should be on BYPASSING the module and related codes, so that repeated SKREEM problems will be a thing of the past. I think I read some have had repeated failures, so a bypass one time purchase would be beneficial to everyone (one time and done).
.
You are a long time member here and a good guy - but please stop. For the millionth time, that is not possible.
The handshakes that go on between SKREEM and ECM are not simple. To do what you ask, would mean a major rework of, at least, the ECM. If that were possible, this gentleman would be working on that as a cure.
We are DAMN fortunate that ONE guy, so far only one, has got as far as he has.
We are DAMN fortunate that ONE guy, so far only one, has got as far as he has.
It is great he's working on a solution for failed hardware. We will no doubt need it. But, if your Crossfire has an immobilizer related failure, don't leave it sitting waiting for a SKREEM in the meantime. Send it for testing and repairs.
As already written my goal would be to replace the skreem completely, if only because of the delivery problem with the key fobs. I had read somewhere that Mercedes has problems to get suitable transponders. This electronic components are no longer produced because the transponders used by mercedes are from the 90s.
But if there is more interest from your side to have only a bypass for the immobilizer, I would be finished with the development and could offer this after several months of testing.
What do you want?
1. only bypass
2. skreem replacement
It is great he's working on a solution for failed hardware. We will no doubt need it. But, if your Crossfire has an immobilizer related failure, don't leave it sitting waiting for a SKREEM in the meantime. Send it for testing and repairs.
Yes my goal is to make a generic skreem, so the problem with the not available key fobs were be also solved. I thing I will go a way to unlock the car with RIFD or NFC Tags. If your skreem already works, you can read out from that 4000 codes (if your skreem has already so much) my module will make with a trick 8000 codes of them. No PCM programming necessary. You can repeat this so long until your skreem has no more codes.
If your skreem is broken you became from me 8000 codes but your PCM had to be programmed that it will work with this codes. If you have used all 8000 codes you will have two options:
First: Buy an other EEPROM from me with 8000 codes (or buy it at one with my Skreemulator).
Second: Reprogram your PCM and reset my SKreemulator, than you can use the 8000 codes again. This can be repeated infinitely.
How did you arrive at the conclusion that there are a limited number of starts in the system? This contradicts what is in the student manual.
I find it hard to believe that a manufacturer designed a car with only a certain number of starts.
I believe (correct me if I'm wrong) Viper-666 is referring to a transponder bypass, not a SKREEM bypass. In other words, programmed keys would not be necessary, but his SKREEM still would be. The transponders are not the problem, the handshake between the ECM and SKREEM is the problem. A true bypass or immobilizer delete would involve rewriting the program for the ECM, as previously noted, so it no longer looks for authorization from the SKREEM. Not simple on this model. I see no need for a transponder bypass. Transponders are and always will be readily available. You will only be making your car easier to steal and you would still need a SKREEM module (his). But, to each his own. I'm going to keep my transponders and fix the SKREEM IF and WHEN necessary. So far, neither of our cars has ever had an issue. Of all the Crossfires we have worked on, only one or two had a real SKREEM hardware failure.
We look forward to seeing your finished product Viper-666.
Re: I hacked the Skreem, the Skreemulator
