Immobilizer bypass

[Bill Verburg]

After doing a lot research and packing everyone's brain that I could

At last the immobilizer has been by passed,

total cost
1 chip that does not expect an immobilizer signal I'm using A Steve Wong chip
1 relay part# 964.610.184.00

[vmax]

Is this just a jumper for pins 30 and 87? Does it do the same thing as a jumper wire?

Nice find.

[Bill Verburg]

Originally Posted by vmax

Is this just a jumper for pins 30 and 87? Does it do the same thing as a jumper wire?

Nice find.

pin 3(30) to pin 5(87)

AFAIK, yes, it's just a jumper. A well known CT. shop makes their own, and reinforced my idea of how to go about doing this, But I found this in the wiring manuals and thought it to be a good way to go.

[ky911sc]

So by plugging in this relay, I can eliminate the pain in the arse immobilzer on my 95?
If so, super find, thanks for sharing.
Where is the source for the relay? Dealer only?

[Bill Verburg]

Originally Posted by ky911sc

So by plugging in this relay, I can eliminate the pain in the arse immobilzer on my 95?
If so, super find, thanks for sharing.
Where is the source for the relay? Dealer only?

you need to do 2 things
chip
relay replacement

dealer item, last week there were 6 in the warehouse. I got one

[ky911sc]

Bought a chip that I never installed.
Not a Wong, but willing to try...

Thanks.

[Birol]

Does that work on 993s too ?

And what is the result in the end ?

Can the immobilizer be thrown out of the window forever and it´s never pressing annoying buttons again?
All I need is the key to open and start the engine decently ?

If so, that´s perfect !

[Bill Verburg]

Originally Posted by Birol

Does that work on 993s too ?

And what is the result in the end ?

Can the immobilizer be thrown out of the window forever and it´s never pressing annoying buttons again?
All I need is the key to open and start the engine decently ?

If so, that´s perfect !

it's not perfect but

yes, it is for '95 993, my blue car, probably any other 993 that can swap chips in the DME

now my car is a bastard
'95 US chassis & DME
'97 RoW engine

but the electronics are all standard US 55pin OBD1 which is essentially what RoW n/a 993(Bosch DME version 2.10.1) use, the engine was a plug and play deal w/ rewiring necessary for the switch from non vram to vram and the elimination of the SAI pump.

my car has always thrown an 'Oh my god' light due to the custom chip, the cancel button on the console shuts it off

w/ the above relay bypass on the R61 relay the immobilizer is a non issue, get in turn the key , drive off. Remote door locks are unaffected

One of these days I'll get time to swap in the RoW non- immobilixer DME that came w/ the engine and see if that eliminates the 'Oh my god' light

[North Coast Cab]

That is cool but my '95 does not have a relay or socket in that location.

[964TargaC2]

Relay is known as a bridge relay...its as stated, a jumper.. verrrry clever Mr Verburg....verrrry clever..

[levtron]

Any chance this will work on a late (June 1996) production???? This would be awesome. My understanding is that it the 96 C2 can not be chipped, so not sure if this would work.

Hopeful.....

[Bill Verburg]

Originally Posted by levtron

Any chance this will work on a late (June 1996) production???? This would be awesome. My understanding is that it the 96 C2 can not be chipped, so not sure if this would work.

Hopeful.....

The issue will be the '96 DME(assuming it is a US OBD2) car) the US '96 DME does not have a replaceable chip which is a prerequisite for bypassing the immobilizer

[levtron]

Bummer... I presume changing out the DME is not an option?

[theamgman]

hi ... would this work with my 96 993 turbo ? my fob don't works some times and the car will not stars .

[Bill Verburg]

Originally Posted by levtron

Bummer... I presume changing out the DME is not an option?

yes, the DME can be changed to a '97 or '98 US unit which does have a replaceable chip, there are also specialty shops that have the skill and equipment to resolder a chip into the '96 unit. I'm not at all familiar w/ this end at all though.

Some possible contacts
Rennsport Systems
Protomotive

[Bill Verburg]

Originally Posted by theamgman

hi ... would this work with my 96 993 turbo ? my fob don't works some times and the car will not stars .

A friend had this done on his 993tt, the relay works as on my car, the chip was done by Musante Motorsports

[nod okim]

wondering if anyone can help me I am rebuilding a 1998 993 Carrera when i purchased the car it did not come with the alarm fob. I purchased a used alarm Brain with a fob it would not deactivate the alarm so I purchased the other (under the drivers seat module) module and still no go. just wondering if the above fix would work.

[Lorenfb]

yes, the DME can be changed to a '97 or '98 US unit which does have a replaceable chip"

Not correct! Guessing mis-leads, but not uncommon for what usually gets posted.
There's no replaceable CHIP!

[Bill Verburg]

Originally Posted by Lorenfb

yes, the DME can be changed to a '97 or '98 US unit which does have a replaceable chip"

Not correct! Guessing mis-leads, but not uncommon for what usually gets posted.
There's no replaceable CHIP!

As you well know but choose to ignore, the single chip sets used in the 88 pin US DME's are removable, it does take some skill w/ soldering tools. Once removed these chips can be replaced or reflashed and reinstalled to eliminate the immobilizer signal. As w/ the RoW 55pin DME's and US '95 DME's the relay jumper must also be used.

Is unsoldering, reflashing and resoldering as easy as pulling the '55 pin DME chip? No. But can it be done by someone w/ a little skill? Yes.

This is known to work in my car w/ 55 pin US, & 55 pin RoW DME's and in a friends 88pin US 993tt.

The twin chip sets used in the US 88 pin DME's are not reflashable so it's necessary to replace the whole DME w/ a '97 or '98 version.

But it's oh so much more fun to snipe and make snide comments than to actually provide useful information

[Lorenfb]

"yes, the DME can be changed to a '97 or '98 US unit which does have a replaceable chip"

As I said, there's no replaceable chip.
Here's a picture of a '98 993 DME.
This DME is externally reflashable.

"the single chip sets used in the 88 pin US DME's are removable"

Furthermore, as seen in the picture, these DMEs are not "single chip" but have
two key/major 'chips' (two microcontrollers/microprocessors).

"chip sets used in the US 88 pin DME's are not reflashable"

Right, which only applies to the US '96 DME.
As mentioned above, the '97/'98 are reflashable.

"yes, the DME can be changed to a '97 or '98 US unit which does have a replaceable chip, there are also specialty shops that have the skill and equipment to resolder a chip into the '96 unit."

- From an earlier post -

Again, the '97/'98 does not have a replaceable chip. With much effort and Mickey Mouse mods,
the '96 circuit board can be re-worked with added components to allow coding changes. This
is highly unreliable from what I've seen from some of my customers that had it done."

All this has been discussed and clarified many times on Rennlist.