Brake switch on 996 Cup Car
03-16-2015 | 05:28 PM
#16
Rennlist Member
Joined: Nov 2004
Posts: 544
Likes: 1
From: Charlotte
It is as simple as it sounds 
Don't remove any bumpers or body parts. We just need to locate a brake light wire - might be easier to start from the back of the car - 3rd brake light - and work forward until you find a good place to tap into the signal. Use a multimeter and check for a signal/power through the wire when the brake pedal is pressed. Signal/power should stop when pedal is released.
Source an Aim patch cable for your Evo. Cut off one end. Now you have a stretch of wire with binder on one end and can see the component 4 wires. You only need to connect one wire of these to the brake light signal. You want to use the white wire, pin 1. Slice the cable about 4cm so that you can separate it from the other three wires and work with it. Secure the unneeded three wire ends with electrical tape (or such).
Use the positap (or equivalent) to connect the Aim wire to the brake signal wire that you located and tested earlier.
Route wire to the Evo and connect.
Open RaceStudio and add custom sensor.
Matt's site has some good info and includes a nice doc at the bottom here:
http://www.trailbrake.net/featured-a...custom-sensors
Don't remove any bumpers or body parts. We just need to locate a brake light wire - might be easier to start from the back of the car - 3rd brake light - and work forward until you find a good place to tap into the signal. Use a multimeter and check for a signal/power through the wire when the brake pedal is pressed. Signal/power should stop when pedal is released. Source an Aim patch cable for your Evo. Cut off one end. Now you have a stretch of wire with binder on one end and can see the component 4 wires. You only need to connect one wire of these to the brake light signal. You want to use the white wire, pin 1. Slice the cable about 4cm so that you can separate it from the other three wires and work with it. Secure the unneeded three wire ends with electrical tape (or such).
Use the positap (or equivalent) to connect the Aim wire to the brake signal wire that you located and tested earlier.
Route wire to the Evo and connect.
Open RaceStudio and add custom sensor.
Matt's site has some good info and includes a nice doc at the bottom here:
http://www.trailbrake.net/featured-a...custom-sensors
I found that you can quite easily go from 12 to 5 V by dismantling some random USB cigarette lighter car charger and using the electronics (opened one and it is pretty straightforward it seems).
And being the complete noob that I am (and by noob, I really mean NOOB), where should I start looking to find that wire? Anyone got some schematics to see how to access that wire? I opened the engine lid but didn't see much there. Maybe I need to remove the rear bumper? Or Can I access the correct wire somewhere in the front part of the car?
The problem is that I'm always scared of screwing things up, but if I never do anything myself I guess I'll never learn doing something myself ...
In theory it sounds simple:
- find brake wire +
- take an AiM cable and connect the input voltage pin to a wire to connect to the brake wire + (do I only need to connect 1 of the 4 wires? No negative that I need to connect to the chassis?)
- use some kind of positap connector to connect both
- route the AiM cable through the car
- program and test
In practice it always seems like mission impossible for me once I sit next to the car.
Well, maybe it's not a surprise, coming from someone who doesn't understand why you don't get electrocuted in your car while the negative part of the circuit is wired to the chassis
I m more at ease replacing brakes and cleaning wheels
So any suggestions, tutorials, links to help me out a bit?
And being the complete noob that I am (and by noob, I really mean NOOB), where should I start looking to find that wire? Anyone got some schematics to see how to access that wire? I opened the engine lid but didn't see much there. Maybe I need to remove the rear bumper? Or Can I access the correct wire somewhere in the front part of the car?
The problem is that I'm always scared of screwing things up, but if I never do anything myself I guess I'll never learn doing something myself ...
In theory it sounds simple:
- find brake wire +
- take an AiM cable and connect the input voltage pin to a wire to connect to the brake wire + (do I only need to connect 1 of the 4 wires? No negative that I need to connect to the chassis?)
- use some kind of positap connector to connect both
- route the AiM cable through the car
- program and test
In practice it always seems like mission impossible for me once I sit next to the car.
Well, maybe it's not a surprise, coming from someone who doesn't understand why you don't get electrocuted in your car while the negative part of the circuit is wired to the chassis
I m more at ease replacing brakes and cleaning wheels
So any suggestions, tutorials, links to help me out a bit?
