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Old 03-16-2010, 07:03 PM   #1
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Default wireing up brake switch for tcc

anyone have a wireing chart for a brake switch and relay set up. i have a wire off my stand alone harness for tcc i think its called that i was told the best way to do that is to use a relay thanks mike
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Old 03-16-2010, 08:10 PM   #2
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http://www.lt1swap.com/pictures/16_a...amp_switch.gif

It required 12v IGN and open with the brake depressed. No relay is required
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Old 03-16-2010, 09:27 PM   #3
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problem is my stock miata brake switch works like a nitrous botton when its pushed it supplys power to lights, i was told some how i could wire in a relay so it can also take power away from the tcc wire but still remain a normal brake switch ???
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Old 03-16-2010, 09:50 PM   #4
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I'm about ready to get a brake switch w/cruise for a mid 70's chevy truck. It will have two switches in it. One is NO and one is NC. One for the brake and one for the cruise. Use the NC (cruise side) for the TCC signal.
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Old 03-16-2010, 11:41 PM   #5
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Quote:
Originally Posted by 1bigcam View Post
p i was told some how i could wire in a relay so it can also take power away from the tcc wire but still remain a normal brake switch ???
Standard bosch style relay.

terminal
85 - ground
86 - to brake wiring on car.
30 - to IGN + 12v
87a - to tcc wire/PCM
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"possible" is a relative term around here... anything is possible. It's "possible" to put a whole K3500 4x4 dually truck rolling chassis under a brand new Mini body. Is it reasonable? No. Does it make sense? No. Is it possible? Yes.
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Old 03-17-2010, 12:30 AM   #6
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86 to what side of the break switch? thanks very much thats what i was looking for
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Old 03-17-2010, 01:16 AM   #7
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To the side that connects to the brake lights
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Originally Posted by Rodder
"possible" is a relative term around here... anything is possible. It's "possible" to put a whole K3500 4x4 dually truck rolling chassis under a brand new Mini body. Is it reasonable? No. Does it make sense? No. Is it possible? Yes.
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Old 03-17-2010, 10:58 PM   #8
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To the side that connects to the brake lights
that wont make my brake lights stay on will it?
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Old 03-17-2010, 11:11 PM   #9
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Nope, should not affect the brake lights at all.
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Originally Posted by Rodder
"possible" is a relative term around here... anything is possible. It's "possible" to put a whole K3500 4x4 dually truck rolling chassis under a brand new Mini body. Is it reasonable? No. Does it make sense? No. Is it possible? Yes.
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Old 03-18-2010, 06:10 AM   #10
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Check your Miata dot net PM I sent.
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Old 03-18-2010, 07:11 AM   #11
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If your Mazda uses the 3/8" barrell type plunger switch, you can use a brakelight switch from an 82 Monte Carlo with cruise control, has one set normally open, and one set normally closed contacts, which reverse themsleves when you step on the brakes.....

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Old 03-18-2010, 07:21 AM   #12
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http://www.700r4.com/tech/tcc/relay_.../diagram.shtml

Use either diagram but instead of hooking it up to the trans, the wire goes to the PCM blue connector pin 33 (purple wire).
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Old 03-18-2010, 01:07 PM   #13
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Auto PCMs require both the brake switch to PCM wire and the PCM to trans TCC wire. There is no choice. Leaving one off will prevent TCC control and burn up the trans in short order
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Old 01-03-2012, 08:59 AM   #14
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Bringing this back up from the dead. I have the same issue, how did you get it to work?

Also, where is the PCM to TCC wire located?
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Old 01-03-2012, 09:03 AM   #15
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I used just the relay and its still not unlocking. I see two wires in the diagram above for PCM to TCC. which one do I tap into and what does it need? (12v? or what)
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Old 01-03-2012, 10:35 AM   #16
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Quote:
Originally Posted by camaroboricua View Post
I used just the relay and its still not unlocking. I see two wires in the diagram above for PCM to TCC. which one do I tap into and what does it need? (12v? or what)
If you are using the standard 4L60e tranny harness, then u only need one wire to tell the PCM when u are stepping on the brake.. blue connector, pin 33.

a normal 5 pin relay has 2 outputs.. 85/86 switch the relay on. 30 gets switched to 87 or 87a.

87a is connected to 30 normally (Normally Connected, aka NC)
87 is connected to 30 ONLY when 85/86 are energized.. (Normally Open, aka NO)

the key thing is 87a becomes UNCONNECTED when 85/86 are energized..
so 87a and 87 toggle.

SO, you connect 87a to pin 33 of the PCM. so power is supplied ALL THE TIME, EXCEPT when the brake is applied (85/86 are energized), then it is disconnected.

the rest is up to the PCM..

now, in my case, I will NOT have a PCM controlled tranny (700r4), so I have to wire it (87a on the relay) to the wire on the tranny directly (like the bowtie overdrives drawing)

Sam
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Old 01-03-2012, 11:56 AM   #17
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Quote:
Originally Posted by Pocket View Post
Auto PCMs require both the brake switch to PCM wire and the PCM to trans TCC wire. There is no choice. Leaving one off will prevent TCC control and burn up the trans in short order
I only have Blue 33 pinned on my S10 and I have no issues.

12v Ignition to the Switch on one wire, the other to Blue 33. The PCM needs that 12v Signal from the Brake Pedal to lock the Convertor. Step on the Brake, signal off.

Like mentioned with the Relay, 85 is ground, 86 is off of the 12v Brake Wire going to the lights, 30 is 12v Ignition in, 87a is to the Blue 33 on the PCM. Step on the Brakes, 12v goes to the lights, energizes the Relay, stops the 12v to the PCM and Convertor.
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Old 01-03-2012, 06:55 PM   #18
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You left out the TAN/BLK wire from R42 and your converter still locks up? I find that hard to believe since it directly controls the lock up solenoid

http://www.lt1swap.com/pictures/16_a...amp_switch.gif
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Old 01-03-2012, 07:50 PM   #19
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Well ofcourse that is in there..that's factory in the Auto Harness. I guess I misread your post.

However, if neither is pinned then the Convertor wont lock.
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Old 01-04-2012, 12:48 AM   #20
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Quote:
Originally Posted by sdetweil View Post
If you are using the standard 4L60e tranny harness, then u only need one wire to tell the PCM when u are stepping on the brake.. blue connector, pin 33.

a normal 5 pin relay has 2 outputs.. 85/86 switch the relay on. 30 gets switched to 87 or 87a.

87a is connected to 30 normally (Normally Connected, aka NC)
87 is connected to 30 ONLY when 85/86 are energized.. (Normally Open, aka NO)

the key thing is 87a becomes UNCONNECTED when 85/86 are energized..
so 87a and 87 toggle.

SO, you connect 87a to pin 33 of the PCM. so power is supplied ALL THE TIME, EXCEPT when the brake is applied (85/86 are energized), then it is disconnected.

the rest is up to the PCM..

now, in my case, I will NOT have a PCM controlled tranny (700r4), so I have to wire it (87a on the relay) to the wire on the tranny directly (like the bowtie overdrives drawing)

Sam
Quote:
Originally Posted by the_merv View Post
I only have Blue 33 pinned on my S10 and I have no issues.

12v Ignition to the Switch on one wire, the other to Blue 33. The PCM needs that 12v Signal from the Brake Pedal to lock the Convertor. Step on the Brake, signal off.

Like mentioned with the Relay, 85 is ground, 86 is off of the 12v Brake Wire going to the lights, 30 is 12v Ignition in, 87a is to the Blue 33 on the PCM. Step on the Brakes, 12v goes to the lights, energizes the Relay, stops the 12v to the PCM and Convertor.
Thanks for the explanations, It helps to better understand what needs to happen. I wired the relay as stated on the previous post. Which seems to be the exact way you mention it. So unless I accidentally did it wrong, it didnt work for me. I hear it click but the TC still stays locked. I ran out of time so I havent messed with it since and I didnt use the multimeter to verify that it worked. Now that I understand it better I can go and test it to see if it is working properly or where I messed up.
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You left out the TAN/BLK wire from R42 and your converter still locks up? I find that hard to believe since it directly controls the lock up solenoid

http://www.lt1swap.com/pictures/16_a...amp_switch.gif
My harness is from a 2000 A4 and the only modifications to it were the ones needed to make the swap work. I did not disturb the trans wiring.
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Old 01-04-2012, 12:48 AM
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