03-09-2024, 02:31 PM | #239 |
Somewhere in the Kalahari
Drives: 2021/18 (de-fresh) 3LT RS Join Date: Dec 2017
Location: California
Posts: 665
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Interested to hear a test of the rear fuse box info - that would be a great combo with the various other options...
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03-09-2024, 04:58 PM | #240 |
I plugged in my OBD reader with the fuse installed, and it powered up & communicated with the car, even without the ignition turned on. I simply opened the car door (with my fob in my pocket), pulled my OBD port out of the dash, unplugged my AFM disabler, and plugged in my OBD reader. I pulled the fuse (it's a 10A) and the OBD port did not have any power, and the OBD reader did not power on. It didn't throw any codes. Seems like this might be a good free option if you're parking in an area that you're unfamiliar with, or a potentially unsafe area.
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03-09-2024, 05:05 PM | #241 | ||
Quote:
Quote:
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2020 Camaro 2SS - Riverside Blue, NPP, Magnetic Ride, Sunroof
RUXIFEY Smoked LED Side Marker Lights / Black SS emblem on rear bumper / Blue SS vinyl overlay on front bumper emblem / Wildhammer Rear Dark Reflectors / Trim Illusion Gloss Black Door Handle Covers / eBay Black Fuel Door / Screaming Chicken Fender Hash Marks / Color-Matched G2 Caliper Paint RE Audio RFX10D4 10" Sub / Hand-made sub enclosure / Hifonics Zeus ZRX1200.1D amp / JL Audio LoC-22 line output converter / Sub Thump Plug N Play T-Harness With ANC Defeat Harness Kit My Camaro Journal |
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03-09-2024, 05:46 PM | #242 | |
Drives: 2019 ZL1,2016 2SS, 2017 320d F30 Join Date: Dec 2021
Location: Europe
Posts: 20
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Quote:
But I will definetly plug there a blown fuse in. Thieves won't have enough time to check fuses, they probably think the OBD is just broken or disconnected and leave. Another security adder might be to disable the open trunk button in the door, unless they can unlock the trunk from the inside with the buttons near the door handle. Maybe these do only unlock the driver and passenger door. So that the only way to unlock the trunk to reach the fuse would be to sneak from the rear seat into the trunk in order to pull the emergency latch. |
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03-09-2024, 06:28 PM | #243 |
Drives: 2024 Camaro 1SS M6 Join Date: Nov 2023
Location: Western NY
Posts: 171
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Great stuff! Thanks for figuring this out.
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03-09-2024, 08:29 PM | #244 |
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Ordered Mobilistics today.
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03-09-2024, 08:41 PM | #245 | |
Drives: 23' 2SS 1LE M6;19' Sierra 1500 AT4 Join Date: May 2023
Location: Austin, TX
Posts: 118
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Quote:
Maybe also test with a self-powered OBD device to ensure there is no data communication with the vehicle with fuse pulled. I could be wrong but I don't think the fuse kills the data communication. Some of us are disconnecting the CAN data wires from the OBD port as a safety measure and leaving the power wires connected. There is a thread on this. |
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03-10-2024, 07:20 AM | #246 | |
Drives: 2019 ZL1,2016 2SS, 2017 320d F30 Join Date: Dec 2021
Location: Europe
Posts: 20
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Quote:
In the OBD connection Slot 16 will be without power. Usually OBD connectors grab their power from there in order to work. OBD plugs are commonly connected with a laptop through USB (just like HPTuners). USB can only deliver 5 volts, this is pretty sure not enough to power and access the car modules. Of course they could add additional wires to externally power it with 12 volts, but makes the stealing device more complicated. Funny thing would be to install a dummy OBD which works exactly like those USB Killers, which instantly kills devices when plugged into. At the end it's a small trick for no costs and should be combined with other theft preventions.
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excuse my english
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03-10-2024, 12:03 PM | #247 | |
Drives: 23' 2SS 1LE M6;19' Sierra 1500 AT4 Join Date: May 2023
Location: Austin, TX
Posts: 118
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Quote:
I however wanted to provide some insight to those who use the OBD fuse method so they have a good understanding of what protection they do or don't have. The CAN bus that the OBD devices use to communicate with the vehicle doesn't operate at 12V, it's between 1V-4V. I don't think self-powered OBD devices use the 12V from the port (but could be wrong). No one should take my word for it though (I am just a random guy on the internet ). Those who are interested should google how the CAN physical layer works and also look at the CANH/L operating conditions of automotive CAN transceivers and decide for themselves. I am not telling anyone how they should protect their own vehicle but point I am trying to make through this is that OBD-wise, what is more important to disconnect is the data wires and not the power. Cheers. Btw, I wouldn't recommend OBD port killer though . You might kill friendly OBD devices like from the dealer and they will probably be very unhappy with you. |
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03-10-2024, 01:22 PM | #248 |
Somewhere in the Kalahari
Drives: 2021/18 (de-fresh) 3LT RS Join Date: Dec 2017
Location: California
Posts: 665
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I can also confirm that the ODB port has power with the ignition off -- it powers up my Autel code reader when I just open the door and plug it in. But I haven't had a chance to test the OBD fuse pull against port-powered versus self-powered devices.
Mounting one of those universal fuse bypass switches in an inconspicuous spot in the trunk would be a convenient way to implement the fuse pull. However, as noted in the prior post, the usefulness of that comes down to whether that approach actually impacts the type of devices that are typically used in the OBD thefts. |
03-10-2024, 01:53 PM | #249 | |
Drives: 2019 ZL1,2016 2SS, 2017 320d F30 Join Date: Dec 2021
Location: Europe
Posts: 20
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Quote:
"Terminal 16: Scan tool power, battery positive voltage terminal" In the wiring diagram it also gets powered directly by the 12V battery.
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excuse my english
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03-10-2024, 01:59 PM | #250 | |
Somewhere in the Kalahari
Drives: 2021/18 (de-fresh) 3LT RS Join Date: Dec 2017
Location: California
Posts: 665
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Quote:
I am using this on an OBD splitter cable. This lock latches onto a nub on the bottom of the OBD connector. That nub had an angled ramp (circled in photo below) that I think makes it easier to pry off the OBD lock. So I cut that angled ramp off the nub so the lock has a flat surface to grab against (arrow points to the modified nub). I also added a flat plastic shim inside the lock to eliminate the front to back slack. An appropriate (or inappropriate?) level of brute force will likely still be able to remove the lock, but that just leads to another set of "problems" for the would be thief. TBD. Finally, I have the following splitter coming for possible use. With my OBD port appearing disabled, someone looking under the dash will see three bright yellow connectors hanging down in various places. Maybe they will have 12V... maybe they will fry a device hooked up to them... or maybe they will be connected to a salvaged ECU that the thief's OBD device can try to talk to. Options! |
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03-11-2024, 09:18 AM | #251 | |
Drives: 23' 2SS 1LE M6;19' Sierra 1500 AT4 Join Date: May 2023
Location: Austin, TX
Posts: 118
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03-11-2024, 06:03 PM | #252 |
I talked with my cousin today, who has a huge auto shop class in a high school that looks nicer than most shops. He has several scan tools in his shop. He can use a powered scan tool (Snap On or others) to communicate with the car even if the OBD fuse has been removed. So unless the thieves aren't using a powered device, removing the fuse won't do much good. :(
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RUXIFEY Smoked LED Side Marker Lights / Black SS emblem on rear bumper / Blue SS vinyl overlay on front bumper emblem / Wildhammer Rear Dark Reflectors / Trim Illusion Gloss Black Door Handle Covers / eBay Black Fuel Door / Screaming Chicken Fender Hash Marks / Color-Matched G2 Caliper Paint RE Audio RFX10D4 10" Sub / Hand-made sub enclosure / Hifonics Zeus ZRX1200.1D amp / JL Audio LoC-22 line output converter / Sub Thump Plug N Play T-Harness With ANC Defeat Harness Kit My Camaro Journal |
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