I have no other issues found. I'm now making the electrical schematic and wait for parts I have ordered.
And I have to figure out how the original skreem communicates with the other modules to open and close the car and enable/disable the alarm.

 

Hello,
I want to post a quick update. I was in holidays for a few weeks so I haven't a lot of time to work on that. But to figure out how the original skreem communicates with the other modules to open and close the car and enable/disable the alarm is really hard, I haven't any solution yet.
But I have had a skype meeting with the guy who will support my project in the US and in the discussion we have the question why don't disable the immobilizer function in the PCM. And there is a possible way to do this. This way would be a module what will be connected to the PCM and so the Skreem would only open/close the car.
But this would't be plug and play, you have to open the PCM and solder wires on it or send it to my partner who would do that.

The advantages of this solution would be:
- It also works on those where the skreem is already defective.
- There are no more limitations on how many codes are available.

The disadvantages:
- The PCM has to be modified.
- The PCM would have to be sent to my partner in the US for those who cannot modify it themselves.
- The immobilizer is deactivated.

My questions:
1. Is it OK for you if the immobilizer is completely disabled?
2. Is it OK for you to send your PCM to my partner in the US?

 

1-i wouldnt mind to have the immobilizer completely disabled;
2-i would like to learn what has to be done so i can decide if am able to do so (if you can provide details)
otherwise yes, i would send it to be done to your partner.
thank you for the great idea!
and thank you for stay working on this project.

 

I agree i wouldn't mind to have the immobilizer disabled or sending it to your partner.

 

My only concern with the disabling of the immobilizer would be the car could be more easily stolen, wouldn't it? If someone could turn the ignition cylinder (like with a screwdriver) they could start the car, correct? And, by doing so, the steering lock would release, correct?

But, another advantage is you could get replacement keys much cheaper as they would only need to be cut for the cylinder and wouldn't have to have the chip in them, correct?

Thanks - RL

 

That's right

With the chip (transponder) you are right, but if you want to open the car remotely I think you always needs a key from Chrysler/Mercedes.

 

I think this option of completely bypassing the SKREEM would be the option of last resort. It also becomes a question of cost. There are at least two companies, SOS in Oregon and another in Florida that have successfully repaired the SKREEM for several people on this forum. Only a failed attempt from either of these companies would move me to try a complete bypass of the SKREEM.

 

No problem with disabling the immobilizer

 

Agreed, exactly what I would like.

 

the fact that with this way the car could be stolen, and that i would need to use the key always ( i dont use the remote),
as the final line of 'gone with the wind'... frankly my dear, .....i dont need the skreem!
i have owned cars with no steal protection all my life, and live in a safe, quiet place, so, after all, it depends of priorities.

 

My thoughts for those worried about disabling the immobilizer:
1. This would permanently cure the Dead SKREEM issue.
2. It would increase the chance of theft by a determined, knowledgeable and skilled thief.
However,

• A thief motivated to want to steal an old Crossfire would probably know that it was protected by an immobilizer
• The thief would NOT know that a modified Crossfire SKREEM was defeated.
• IF the thief had an extremely unlikely guess that it was a modified Crossfire:
  • The car would need to be broken into (broken window, other damage...)
  • The lower dash would need to be dropped
  • The ignition switch would have to be removed the hard way (cutting pin) to use the above mentioned screwdriver option
  • Only then would it be known that the immobilizer was really disabled

Bottom Line:
You have a better chance of dying from the Wuhan Flu than a thief successfully pulling that caper off.
Knowledgeable car thieves would know that Crossfires are protected by immobilizers and if highly motivated for the steal would use a flatbed for the grab.
Would they run the risk to steal an inoperable parts car with a very limited market?
Probably not, but WE run THAT minuscule risk every day, defeated SKREEM or not.

So, Kudos to Viper-666 for his good work!

Just my 2 cents...
Like 180, I have a spare SKREEM bought from NeedsWings before they disappeared, but glad to see this progress for the less fortunate members.

 

Next question, at what cost?

 

Immobilizer, hummmm
get ride of it, and see what else cN be added to the list to get rid of.

Still would be hard to steal
Screw driver wouldn't work, cylinders are alot stronger than they used to be.
And that is why keys are cut, so nothing else can turn it.

If a thief goes through that much damage even trying a screw driver or tearing up the dash if would be a insurance buyout anyway
And they still wouldn't get the car, unless they have alot of time.

I say disable the skreem from the security and its communications with the car and use it as a stand alone unit to lock and unlock the doors.
And no need for it to send codes.

 

Ha, knowledgeable is the key. Our locksmith shop repairs ignition locks all the time on cars that are obviously immobilizer vehicles. People trying to steal cars are not bright.

 

Yes and yes.

My Crossfire is worth less than $10,000; no one is going to steal it here in rural Arkansas. And simply replacing the fuse to the plugs with a BLOWN fuse will keep anyone from starting it anyway.

 

The first thing I have to do is implement the idea and prove that it also works in reality.
Then I have to design a circuit diagram and a circuit board layout.
Now prototypes can be made which have also to be tested by volunteers of yours.
Afterwards, if you are sure that everything works, you can ask the manufacturer for more pieces and determine the price.
The price for the module will be cheaper than the one I already have, because the display would be omitted.

 

Thank you!!!

 

I see the deactivated immobilizer like Chooch, but I can also understand the view of sosxfire and those who feel uncomfortable with it.
I have thought a little bit about the concept and I have come to the conclusion that I can design the module to have both.
Either the immobilizer is always deactivated or you can buy an option where an RFID reader and 10 pieces of RFID tags are included.
Then you can teach the tags to the module and then you have always to hold the tag in front of the reader before starting.

 

thats terrific, but if it is going to delay the release of the deactivated then i would suggest first to have the basic ready for test.
then, as some do the testing, you can dedicate the time and effort onto the other.
this way you will have the evaluation sooner and can release it, for the benefit to those that dont want the other.
after all, it is good to remember how some have been clamoring for a total elimination of the dreaded skreem.
and even for those, the trick suggested by pizzaguy will do fine.
he said: " when need to leave the car on an unsafe place, replace fuse 11, (15 Amps, blue) with 1 blown up. it blocks the coil. "

 

took my idea of the led light ?

Ty for your work and helping to keep our cars on the road.