Line lock button (researching how to do it)

[Brigadir]

This idea doesn't leave my head, so looking how it may be implemented... The goal is straightforward - to have a button that activates line lock in the same way as it's done through instruments cluster but without redundant menus and "wait another 15 seconds".
Provided that I am able to inject MITM CAN messages into the factory bus, optionally modifying existing data in the traffic, I foresee it in the following way:
- the injecting MITM device is placed in the IPC CAN line
- with some external trigger and prechecked conditions based on current CAN data (like engine is running, gearbox in drive, brake pedal pressed) the device sends the mocked signal from IPC to the CAN bus, the same how it happens when line lock is activated through IPC
- in result this signal should activate all the mechanical stuff of line lock

So far I've grabbed CAN logs while doing line lock through the factory way and highlighted the data that changes during this process:

0x2FD (CAN HS3)​

byte 2: 0x02 changes to 0x06, then to 0x0A and finally to 0x0E - it's pretty aligned with states of line lock: off initially -> ok button pressed for 15 seconds -> brake on front wheels engaged -> line lock ended and brake released​

Also this surround data is changed during line lock:

0x7D (CAN HS1)​

byte 0 + byte 1 - brake pressure on front wheels - is aligned with the pressure on rear wheel until line lock releases rear brakes. At this moment the pressure goes up​

byte 2 + byte 3 - brake pressure on rear wheels. When line lock is activated the pressure goes down, at the same moment when it goes up on the front wheels​

​

0x213 (CAN HS1 & HS3)​

byte 3: bit 7 is set when line lock engaged. Actually this bit means that stability control braking is applied​

​

0x242 (CAN HS1)​

byte 2: 0x20 changes to 0xA0 at initial phase of line lock when pressing brake pedal. But the value also changes at some moment when stopping the car and while driving (may be 0x1F when braking)​

I still don't know which CAN IDs are sent from IPC. To check this probably makes sense to run IPC on a desk and simulate all the surrounding CAN traffic (like here: https://github.com/EricTurner3/s550-canbus).

After that, when I discover CAN IDs that IPC sends to the car during turning on line lock, the next step will be to burn this logic into the MITM device and try it on the car.

So, this is the idea. If implemented, it would simplify doing burnouts with line lock to the way it supposed to be - just by activating it with one button. Also it looks like much more cheaper option that other aftermarket solutions (ex. https://www.jpcracing.com/jpc-2015-...ock-kit-w-stainless-steel-brake-line-upgrade/). Looking forward if anyone has any info to share on this topic.

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[Brigadir]

After checking this stuff with a standalone IPC module on a desk, and reviewing list of modules that send/receive data on CAN bus (ex. https://www.fofusion2.com/ford_fusi...scription_description_and_operation-2613.html), it's sad to assume that IPC looks like only reads the data and doesn't send any messages from itself to the bus. Probably all line lock functionality is managed in BCM module...

 

[NGOT8R]

The factory line lock is a challenge at times when needing to access it, such as, timing out, having to reenter track apps and start over while on the track. It would have been nice if Cord had made it a single button setup.

I ran a JPC line lock on my 2013 GT which operated off of a single button just as you described. It worked great without any issues.

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