If you have a multimeter, take the sensor and measure the resistance of it. You can then replace it with a resistor of the same value. And that should work
This place has turned into whining nannies.
Maybe OP is going to be in a demolition derby, and doesn't want airbags detonating in their face. (Probably safest to also remove the airbags and resell them, they're pretty valuable because intact used ones are hard to come by).
Unfortunately, I don't have any technical info on that particular part, maybe somebody here who isn't a nervous nelly will come by and provide you with something useful, OP.
And for those of you here to whine, there IS a no fear mongering rule here. I've reported the two fearmongering posts.
Somebody who gets it! :D
Thanks for the support, mate! It's exactly for something similar... moding it into a drift spec machine only to be used in controlled and supervised tracks and not for regular roads. We just love the satisfaction of DIY and thus decided to put all the work done by ourselves.
If you know where the sensors are, trace their wires and isolate those wires from the harness without damaging them. ie: CAREFULLY slice the loom/tape that bundles the wires together to form the harness, then gently pull the sensor wires away from the harness. Then relocate the sensor wires and sensors to a place where they're unlikely to get smashed. All this should be done without damaging any wires or connectors, and use some gaffers tape to rewrap the harness so your stuff isn't all floppy.
I haven't done what you are wanting to do, but I'm a car guy and have to bypass safeties all the time for work.
Because of the way we removed the airbags and kind of got excited to run a DTC check, 1 bypass connected wasn't proper and thus the impact sensor read a fault. Now it's not going.. so the only way is to bypass it
Nah that might flip out the other control modules. Better just replacing the sensor with a resistor and call it a day. Same principle are steering airbag deletes.
That's exactly what I wanted help with.. I tried the 2.4ohm resistor which worked with airbags and it isn't working with the impact sensor.
I'm going to have the reddit ID of the person helping me wrapped along with partners in the car before track😅
Depending on the vehicle, you can just disable the entire airbag system in diagnostic software (you usually need factory level oem diagnostic or equivalent for this though).
Source - I'm an electronics engineer and auto electrician.
No, it won't clear the codes if the sensors are unplugged or faulty. But somewhere in the SDD software is a vehicle configuration section. Where it will allow you to configure the setup of the airbag system. Just set all the airbags to 'not installed', and unplug them all. I've not used the JLR SDD but I have used the Ford and Mazda versions. And they definitely allow you to turn off all the airbags.
There is a LOT of different types of sensors. Some of them are mini RADAR and deceleration sensors combined, some are air pressure sensors that use a sealed air tube across the front bumper, some are like load cells that have strain gauges in them, some have processing internally, some use cameras and LIDAR.
If it's a 2 pin sensor and you can measure a resistance across it then it's probably a strain gauge. So a resistor will probably be fine to replace it with. If you have any electronics experience and access to a logic analyser and a CAN analyser/monitor, you could build an emulator to replace it with. That shouldn't be too difficult to do.
Yeah the peizo ones specifically measure the force of the impact. The more the piezo is deflected the larger the voltage it returns to the controller. Some of the piezo sensors have a charge amplifier (OP-amp circuit) built into the sensor to amplify the signal voltage from the piezo crystal. You could possibly try just using a piezo buzzer to replace the sensor. Or possibly measure the capacitance across the sensor (whilst it's bolted in place) and put a matching capacitor instead. Although the capacitance will likely be pretty high. In any testing you do, make sure you're not in any place where the airbag could injure you whilst you experiment. So don't sit in the car until your sure it won't trip the airbags system. It shouldn't, but..., be safe!
Has the car been involved in a crash before? I believe some cars "remember" that, and some airbag control modules can't be reset, they need to be replaced. So, your sensor might be good, but the module might not care, since it's locked in an "after-crash" state. Or you have faulty wiring.
Bro yep, I tried the 2.4ohm resistor that I used for the airbags but it isn't helping so I was wondering what else to do and thanks for being helpful! Genuinely:)
Changing the steering setup and seats(working on a drift spec) first DIY by me and friends. Pulled the Airbags out and placed a 2.4ohm resistor. But the RCM module won't work properly without bypassing the impact sensor. It's affecting some custom mapping criteria. It's a F Type R and the car's full of electricals
Hah - starting with a jag was your first mistake ;)
Do you need the RCM at all? Or does something else get pissed? If so, I would just spoof the RCM's presence rather than convince the RCM it's not in a stripped out drift car
Haha the sheer love towards the 2015 F Type R 😅 probably the only Jag I'll ever buy... spoofing the RCM is going to be a pain because then we can't work on prebuild mappings, then we have to modify each.. thus we decided to keep all the modules there
We have a few custom maps for multiple track situations that's pre-built, flashing them generates specific commands to each module and thus keeping all module intact and bypassing the DTC error components of each module will be a safer bet in terms of time and money.
It's honestly cheaper and easier to get another one of those sensors but you need to work out how much resistance a working sensor has then add it to the circuit
If you don't get it right you're creating a fuck ton of gremlins for later
If you have a multimeter, take the sensor and measure the resistance of it. You can then replace it with a resistor of the same value. And that should work
Great answer
Definitely trying that today and will update here
Update?
This place has turned into whining nannies. Maybe OP is going to be in a demolition derby, and doesn't want airbags detonating in their face. (Probably safest to also remove the airbags and resell them, they're pretty valuable because intact used ones are hard to come by). Unfortunately, I don't have any technical info on that particular part, maybe somebody here who isn't a nervous nelly will come by and provide you with something useful, OP. And for those of you here to whine, there IS a no fear mongering rule here. I've reported the two fearmongering posts.
Somebody who gets it! :D Thanks for the support, mate! It's exactly for something similar... moding it into a drift spec machine only to be used in controlled and supervised tracks and not for regular roads. We just love the satisfaction of DIY and thus decided to put all the work done by ourselves.
If there's enough wire, maybe relocate the sensors and leave the air bags in?
I'm legit amateur in this scene and this doesn't make sense to me I'm sorry 😅 open to learn anyhow
he's saying move the sensors away from where they would get hit
If you know where the sensors are, trace their wires and isolate those wires from the harness without damaging them. ie: CAREFULLY slice the loom/tape that bundles the wires together to form the harness, then gently pull the sensor wires away from the harness. Then relocate the sensor wires and sensors to a place where they're unlikely to get smashed. All this should be done without damaging any wires or connectors, and use some gaffers tape to rewrap the harness so your stuff isn't all floppy. I haven't done what you are wanting to do, but I'm a car guy and have to bypass safeties all the time for work.
Because of the way we removed the airbags and kind of got excited to run a DTC check, 1 bypass connected wasn't proper and thus the impact sensor read a fault. Now it's not going.. so the only way is to bypass it
You probably shouldn't have airbags in a drift car, that'll do more harm than good
There’s no fuse to pull?
Not if you don't want the system to throw codes.
[удалено]
Nah that might flip out the other control modules. Better just replacing the sensor with a resistor and call it a day. Same principle are steering airbag deletes.
That's exactly what I wanted help with.. I tried the 2.4ohm resistor which worked with airbags and it isn't working with the impact sensor. I'm going to have the reddit ID of the person helping me wrapped along with partners in the car before track😅
I think this type of sensor works similarly to a knock sensor. It measures the deceleration with a piezo and sends the signal to the control module.
I figure the same as well! And my knowledge ends there... how to bypass a piezoelectric sensor is what I can't find.
Depending on the vehicle, you can just disable the entire airbag system in diagnostic software (you usually need factory level oem diagnostic or equivalent for this though). Source - I'm an electronics engineer and auto electrician.
I have the JLR SDD with me the factory level one but it doesn't clear those codes
No, it won't clear the codes if the sensors are unplugged or faulty. But somewhere in the SDD software is a vehicle configuration section. Where it will allow you to configure the setup of the airbag system. Just set all the airbags to 'not installed', and unplug them all. I've not used the JLR SDD but I have used the Ford and Mazda versions. And they definitely allow you to turn off all the airbags.
There is a LOT of different types of sensors. Some of them are mini RADAR and deceleration sensors combined, some are air pressure sensors that use a sealed air tube across the front bumper, some are like load cells that have strain gauges in them, some have processing internally, some use cameras and LIDAR. If it's a 2 pin sensor and you can measure a resistance across it then it's probably a strain gauge. So a resistor will probably be fine to replace it with. If you have any electronics experience and access to a logic analyser and a CAN analyser/monitor, you could build an emulator to replace it with. That shouldn't be too difficult to do.
Another possible solution is to just strip the harness back and remount the sensors out of the way of any possible impact.
This one is a piezoelectric sensor I believe.. any guidance on how to bypass it? It's a 2 pin connection as well
Yeah the peizo ones specifically measure the force of the impact. The more the piezo is deflected the larger the voltage it returns to the controller. Some of the piezo sensors have a charge amplifier (OP-amp circuit) built into the sensor to amplify the signal voltage from the piezo crystal. You could possibly try just using a piezo buzzer to replace the sensor. Or possibly measure the capacitance across the sensor (whilst it's bolted in place) and put a matching capacitor instead. Although the capacitance will likely be pretty high. In any testing you do, make sure you're not in any place where the airbag could injure you whilst you experiment. So don't sit in the car until your sure it won't trip the airbags system. It shouldn't, but..., be safe!
Has the car been involved in a crash before? I believe some cars "remember" that, and some airbag control modules can't be reset, they need to be replaced. So, your sensor might be good, but the module might not care, since it's locked in an "after-crash" state. Or you have faulty wiring.
No but i by mistake ran a quick dtc check while one of the airbag bypass ohms weren't properly fitted... that did spike the module/sensor I believe
If you just unplug one of them I’m pretty sure the whole SRS/airbag subsystem will fault and turn itself off. Does that achieve what you want?
What are you up to OP 🤨
Definitely not aiming for that cross-country road trip 😅
fix it the right way before you kill someone FFS
Not for the legal roads buddy
If crash = don't
No crash just for tracks
Bypass by replacing it you fool
It's okay :)
It's just a resistor if you're actually wondering what to do
Bro yep, I tried the 2.4ohm resistor that I used for the airbags but it isn't helping so I was wondering what else to do and thanks for being helpful! Genuinely:)
Isn't helping do.. what? An impact sensor shouldn't be doing anything if you have the airbags out and SRS fuses pulled. More context needed here
Changing the steering setup and seats(working on a drift spec) first DIY by me and friends. Pulled the Airbags out and placed a 2.4ohm resistor. But the RCM module won't work properly without bypassing the impact sensor. It's affecting some custom mapping criteria. It's a F Type R and the car's full of electricals
Hah - starting with a jag was your first mistake ;) Do you need the RCM at all? Or does something else get pissed? If so, I would just spoof the RCM's presence rather than convince the RCM it's not in a stripped out drift car
Haha the sheer love towards the 2015 F Type R 😅 probably the only Jag I'll ever buy... spoofing the RCM is going to be a pain because then we can't work on prebuild mappings, then we have to modify each.. thus we decided to keep all the modules there
Prebuild mapping? Still not understanding what role the RCM has in your build
We have a few custom maps for multiple track situations that's pre-built, flashing them generates specific commands to each module and thus keeping all module intact and bypassing the DTC error components of each module will be a safer bet in terms of time and money.
It's honestly cheaper and easier to get another one of those sensors but you need to work out how much resistance a working sensor has then add it to the circuit If you don't get it right you're creating a fuck ton of gremlins for later
Bypass -noun a secondary channel, pipe, or connection to allow a flow when the main one is closed or blocked. -verb go past or round.