A Plug-and-Play, DIY-Installable 993 Immobilizer Defeat
10-15-2019, 05:52 PM
#76
Rennlist Member
will it work on a 95 with OBD1 ???
The following users liked this post:
993c4_Toronto (10-15-2019)
10-15-2019, 06:31 PM
#77
First of all - great job. This is an impressive thing. I do agree - no wires is definitely the way to go.
10-15-2019, 06:59 PM
#78
Seared
Rennlist Member
Rennlist Member
So a quick progress report on the Demobilizer.
The prototype has been running for several weeks now in my car and has kept it "mobilized" the entire time without problem or any unwanted side affects : get in, start. As mentioned it doesn't affect function of the ODB2 port, FOB lock/unlock/programming function, draws only a few milliAmps, and can be switched off at any time to return to "immobilize mode".
The design has been changed to simplify installation even further than in prototype #1 and repackaged. It turns out most of the signals the unit needs are present on the OBD2 port so it made sense to design the device to plug into the port. This reduces the number of wires the user has to deal with to ONE - everything else comes off the ODB2 port. It's a convenient place to mount the unit, too. The design has been miniaturized to fit inside the OBD male plug. A cable exists at a right angle and gets routed under the carpet to a wire bundle in the driver-side footwell. To install, the user pulls a single wire out of the bundle and connects the demobilizer cable to it, and plugs the unit into the ODB port. A pushbutton switch and LED are used to toggle between "Demobilize" (LED flashing) and "Immobilize" (LED off). An important security feature has also been added to prevent someone from "demobilizing" a car simply by turning the unit on (or plugging one in) - the unit has to be "activated" by a FOB unlock.
The pictures below show the new concept and how it might look installed (inert units shown)
Comments and suggestions welcome. More to come soon.
The prototype has been running for several weeks now in my car and has kept it "mobilized" the entire time without problem or any unwanted side affects : get in, start. As mentioned it doesn't affect function of the ODB2 port, FOB lock/unlock/programming function, draws only a few milliAmps, and can be switched off at any time to return to "immobilize mode".
The design has been changed to simplify installation even further than in prototype #1 and repackaged. It turns out most of the signals the unit needs are present on the OBD2 port so it made sense to design the device to plug into the port. This reduces the number of wires the user has to deal with to ONE - everything else comes off the ODB2 port. It's a convenient place to mount the unit, too. The design has been miniaturized to fit inside the OBD male plug. A cable exists at a right angle and gets routed under the carpet to a wire bundle in the driver-side footwell. To install, the user pulls a single wire out of the bundle and connects the demobilizer cable to it, and plugs the unit into the ODB port. A pushbutton switch and LED are used to toggle between "Demobilize" (LED flashing) and "Immobilize" (LED off). An important security feature has also been added to prevent someone from "demobilizing" a car simply by turning the unit on (or plugging one in) - the unit has to be "activated" by a FOB unlock.
The pictures below show the new concept and how it might look installed (inert units shown)
Comments and suggestions welcome. More to come soon.
Amazing work! I loathe the Immobilizer and my 993 doesn’t even have one. But I’ve worked on enough 993s over the years to hate the thing.
An OBD-1 early ‘95 doesn’t come with this silliness.
Andreas
10-15-2019, 07:24 PM
#79
Burning Brakes
10-15-2019, 07:56 PM
#80
Seared
Rennlist Member
Rennlist Member
10-15-2019, 08:58 PM
#81
Burning Brakes
Originally Posted by AOW162435
OBD-1 has a round connector. My car is a 6/94 build, so no Immobilizer.
Andreas
Andreas
10-15-2019, 11:20 PM
#83
10-16-2019, 08:40 AM
#85
Rennlist Member
10-16-2019, 08:42 AM
#86
Rennlist Member
I have a 95 with immobilized with obd 1 hope this works with that setup
10-16-2019, 03:05 PM
#87
Pro
Thread Starter
Lot's of ways a board can fail so no way of knowing for sure. What I do know is that at the very least, the immo has to be able to respond normally to a FOB "unprime" command - that's what makes the car "startable" in the first place, allowing the demobilizer to step in and do its thing. I think the immo is pretty reliable, though. Most of the complaints I've seen are related to the FOB contacts, FOB battery, FOB programming, FOB range, etc. Hope that answers the question.
The following users liked this post:
SpeedyC2 (10-16-2019)
10-16-2019, 03:27 PM
#88
Burning Brakes
That is great news. Sign me up. Any idea on moolah at this stage?
10-16-2019, 06:22 PM
#89
"An important security feature has also been added to prevent someone from "demobilizing" a car simply by turning the unit on (or plugging one in) - the unit has to be "activated" by a FOB unlock."
To confirm, if I'm away from home and my fob battery dies, I'm still mildly screwed. Correct?
To confirm, if I'm away from home and my fob battery dies, I'm still mildly screwed. Correct?
10-16-2019, 10:51 PM
#90
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
I think I'm also one of the few that would like to hardwire it and hide it, leave it off all the time (even without the FOB unlock portion if thats possible).
__________________
Instagram :Swine11 | TitanMotorsports
Swine11 ReBoot - 964 / 993 Shift Boot Trim Panel
2004 996 GT3 | 1986 Carrera 3.2 (future Keen Project) | 2016 Cayenne Diesel
Instagram :Swine11 | TitanMotorsports
Swine11 ReBoot - 964 / 993 Shift Boot Trim Panel
2004 996 GT3 | 1986 Carrera 3.2 (future Keen Project) | 2016 Cayenne Diesel
