MR2 Spyder Push Button Start [Archive] - Toyota MR2 Message Board

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canadam02-20-2006, 12:36 AMGenuine Toyota Accessory

http://toyota.jp/mr-s/dop/interior/image/09-p01.jpg N8s93turbo02-20-2006, 01:02 AMone of the local memphis guys, Eric G., has push button start in his mk2, it looks stock, it fit right in where the cigarette lighter was. canadam02-20-2006, 01:08 AMChances are that's a Honda S2000 push button. Mister2.202-20-2006, 03:49 AMThat is pretty sweet. I wonder if this one would fit in the lighter local too? PHOENIX02-20-2006, 03:50 AMwow, nice find adam, i wonder if it will fit in the mk2s foglight location....hmmmm Mister2.202-20-2006, 03:52 AMOh yah, I see now how that fits.. must be small. Would be cool if that fit in one of those stock switch locations. canadam02-20-2006, 01:10 PMIt'd definately fit in a stock switch location. I'm checking in to finding these. Sirc02-20-2006, 08:23 PMWhat's the part number? It looks damn good. canadam02-21-2006, 12:55 AMWorking on the part number to start a Group Buy. Mr Deuce02-21-2006, 03:05 PMWorking on the part number to start a Group Buy.

yea id be in on that Sirc02-22-2006, 07:57 PMI don't think it's an S2000 one. Those are kind of big. This one looks to be smaller. canadam02-22-2006, 08:09 PMIt isn't an S2000 button. It is a Toyota Genuine Accessory. Sirc02-23-2006, 05:50 AMAh, okay. It looks good, it'd be a nice addition to a spyder. V6'er02-24-2006, 10:16 PMI suggest putting a relay on that switch to keep from engaging the starter when the engine is running. ("Wow Adam, that's a cool switch! What happens when I press it?" and you are spinning at 6000 RPM...)

It's easy to do. One side of the relay coil goes to IGN+ to provide power. The other side of the coil goes to the alternator light on the dash. Then wire the NO (Normally Open) contacts to the switch and to IGN+.

The alternator windings provide enough current to pull in the relay, then once started the alternator jumps in and starts charging, it turns off the relay.

It should work fine, took me a whole 15 seconds to come up with, but I'd have to verify it by looking at the BGB alternator wiring.

Feel free to tell Eric that I came up with this. :) SpeedballTrix02-24-2006, 10:28 PMThats factory?
Wow, didn't know there was a factory pushbutton for the spyder.
Pretty sweet. canadam02-24-2006, 11:23 PMOr you could just turn on the switch, press the button, and turn it off :D


I suggest putting a relay on that switch to keep from engaging the starter when the engine is running. ("Wow Adam, that's a cool switch! What happens when I press it?" and you are spinning at 6000 RPM...)

It's easy to do. One side of the relay coil goes to IGN+ to provide power. The other side of the coil goes to the alternator light on the dash. Then wire the NO (Normally Open) contacts to the switch and to IGN+.

The alternator windings provide enough current to pull in the relay, then once started the alternator jumps in and starts charging, it turns off the relay.

It should work fine, took me a whole 15 seconds to come up with, but I'd have to verify it by looking at the BGB alternator wiring.

Feel free to tell Eric that I came up with this. :) V6'er02-25-2006, 10:33 AM^No. That requires a separate switch. If you have to go thru that much crap, you might as well keep it stock.

Now, one more thing: add a diode to the circuit and it can perform the "autostart" function (just bump the key to Start and the engine cranks until it starts, stops cranking by itself) that comes on a newer Toyotas. V6'er02-25-2006, 12:45 PMOk, all tested. Works great! Just one quick press of the Start button and the car cranks until it starts up then automatically shuts off the starter. Also, a button is not required, just bump the key to Start and let it go.

AutoStart! :D canadam02-25-2006, 01:31 PM^No. That requires a separate switch. If you have to go thru that much crap, you might as well keep it stock.

Uhhh... I don't think so. Looks like that feature is built right into this Toyota start switch.

I'd bet its all internally wired within the switch, and to install this button theres no more to wire in than a normal button. V6'er02-25-2006, 01:35 PMOh? What's that little toggle switch under the pushbutton do?

Regardless, it's lame. canadam02-25-2006, 01:37 PMLooks to me that it turns the button "ON" or off.

Lame ? I guess this style switch isn't for you, unless of course, you'd want to modify it so that little toggle didn't work ;)


Oh? What's that little toggle switch under the pushbutton do?

Regardless, it's lame. V6'er02-25-2006, 02:37 PMIt's very lame if Toyota made it and it requires a toggle switch to disable it. The button idea is cool though, if you like it. Ncturnal02-25-2006, 02:41 PMIt's very lame if Toyota made it and it requires a toggle switch to disable it. The button idea is cool though, if you like it.

It's very lame that Toyota no longer has a sports car in production. :) V6'er02-25-2006, 05:59 PMOk, it's called "Crank and Hold" by Toyota (I think), and it looks like it's most a 2003-2004 truck feature, but I can't find a lot written about it using that phrase. canadam02-25-2006, 06:19 PMI'm not sure if the Toyota system uses a relay like your plan or not. Regardless, I personally like the fact you can turn it off.


It's very lame if Toyota made it and it requires a toggle switch to disable it. The button idea is cool though, if you like it. V6'er02-25-2006, 09:38 PMMy point (Ok, one of them) is that it shouldn't be so damned complicated just to start your car! canadam02-25-2006, 09:40 PMThat's why most people use the key ;) haha V6'er02-25-2006, 09:43 PMFinally we agree on something. :D Sirc02-26-2006, 05:24 AMRemote starter for the win. V6'er02-26-2006, 02:10 PMONLY if the remote starter has a BIG red button. :D canadam02-26-2006, 02:11 PMhaha, what the hell is the point of a remote start in California ?! V6'er02-26-2006, 02:13 PMSo the guy that's stealing your car doesn't have to break things as he steals it. :) Mr Deuce02-26-2006, 07:47 PMa friend of mine at a dealership asked the parts guy if this button would easily wire in
heres what he said:

I was told by the parts kid it would not and I didnt belive him so i asked a mechanic and he said the that the systems push different apms and currents and he wouldnt recomend sutting up a perfect wire harness unless he sure it could be done


i dont trust the dealership though. im saying bs bc how could the s2k button work so easily WoRR Pyro02-26-2006, 08:31 PMcould probably wire it the other way, if you were so inclined.. =X V6'er02-26-2006, 09:31 PMi dont trust the dealership though. im saying bs bc how could the s2k button work so easily

Don't trust them, they apparently don't know crap. The starter circuit draws a small fraction of an amp, and just about any switch will handle it.


BTW, I installed the "crank and hold" feature in my own car today. VERY cool. Just bump the key to the Start position and let it crank away and start automatically. :) Sirc02-28-2006, 02:21 AMSo the guy that's stealing your car doesn't have to break things as he steals it. :)

Werd. That is so true. Mr Deuce02-28-2006, 10:33 AMany luck with part numbers or price? MR2TRD102-28-2006, 11:01 AMI think that button looks like crap compared to the s2k button. I have the S2k button in my dash @ the cigarette lighter and it looks oem. You might want to paint the chrome trim around the button to match your interior though. The thought of not having a "Genuine Toyota Accessory" doesn't really bother me. And for the relay part...I would hope most people you let ride in your car aren't stupid enought to push random buttons. :D V6'er02-28-2006, 04:59 PM^Agreed, but crap happens.

And, adding the relay can add "crank and hold" for CHEAP, so it just makes sense to do it. Mr Deuce02-28-2006, 05:12 PMI think that button looks like crap compared to the s2k button. I have the S2k button in my dash @ the cigarette lighter and it looks oem. You might want to paint the chrome trim around the button to match your interior though. The thought of not having a "Genuine Toyota Accessory" doesn't really bother me. And for the relay part...I would hope most people you let ride in your car aren't stupid enought to push random buttons. :D


i personally like the idea of having a toggle switch to prevent the button from being pressed. Mostly because eventually someone WILL push it lol

although the s2k button does look real sweet. any pics of yours? Mister2.202-28-2006, 05:12 PMWhy don't one of you guys who know how to install a push button start do a write up? Would be cool to have one for a newbie like myself. :) Sirc02-28-2006, 07:53 PMI did one once. It's not that hard, I mean if I could do it then I don't see why anybody couldn't. V6'er02-28-2006, 08:01 PMi personally like the idea of having a toggle switch to prevent the button from being pressed. Mostly because eventually someone WILL push it lol




That's what the five dollar relay is for!!! You DON'T NEED the toggle switch!!! Sirc02-28-2006, 08:16 PMWould someone just buy the damned $5 relay?! The man's going to explode! V6'er02-28-2006, 10:46 PMPiece of cake.

Parts needed:

1. Relay, automotive style like Radio Shack 275-226
2. Two diodes, 1N4002 or similar (very common) 276-1653, pk of 25
3. Start button, if you just have to have it


It's very easy to build, the only tricky part is that you need to know how to wire up diodes. Current flows in the direction of the arrow-shaped schematic symbol. The line on the physical diode (the Cathode) is the cross-line in the schematic. The best thing to do is to cut the leads to about 1/4" long, solder wires to the short leads, then put the diodes in shrink tubing.

Some auto parts stores also carry these relays, sometimes with a nice socket. Without a socket, you just use 1/4" terminals.


How it works:

The Yellow alternator wire provides power to "start" the alternator once the engine is running. With the key ON and the engine not running, the Yellow wire from the alternator is pretty much grounded. (The alternator draws current through the dashboard Battery light.) So, before the engine is started, this side of the relay coil is pretty much grounded.

When the key is turned to start (just bump it to start), voltage is applied to the Red-Wht wire that goes to the Starter Relay, and the engine starts cranking over. Current flows through D2 and turns on the relay, which now has "ground" on the left side of the coil and positive voltage on the right side.

The relay contacts close and current flows through D1, keeping the Starter Relay fed with power, even though you have let go of the ignition key. Hence, "Crank and Hold".

The instant that the engine catches, the RPM's zoom up and the alternator starts charging, which puts +14 Volts on the Yellow wire. Since the relay now has the same voltage on both sides of the coil, it shuts off, and turns off the starter.

If you have a Start button, it turns on the new relay, and you can of course take your finger off of it while the engine starts "automatically". No voltage is sent to the Starter Relay because the D2 diode doesn't conduct current in that direction.

If the engine is running, pressing the Start button does NOT turn on the relay, so the starter is not engaged. And THAT is how to protect your starter and engine without the need of a separate switch.

Power feeding D1 MUST come from the ignition circuit. I put my relay in the trunk because it was easy to get to two of the three wires there, I just had to splice into the Yellow wire in the engine Relay Block and run it into the trunk.

I spliced into the ECU "B+" wires so that Crank and Hold is disabled if you pull the ECU fuse. If you were wondering about D1, it's there to keep from sending voltage back into the ECU if the fuse is out or blown. For instance, if you want to work on your engine and jog the starter a small amount, just pull the ECU fuse and the "Hold" feature is disabled.

If you put the relay under the dash, you just might need a switch to be able to turn off the "Hold" feature when you need it. Or, if something breaks, like your alternator belt, and your car won't stop cranking.

If you only want to interlock the button so it can't work with the engine running, use the more simple bottom schematic. EDIT: I had the Red-Wht wire on the drawing, but the clutch lead is a Red wire. For safety, you obviously want to wire in ahead of the clutch switch. Mr Deuce03-01-2006, 12:56 AMPiece of cake.

Parts needed:

1. Relay, automotive style like Radio Shack 275-226
2. Two diodes, 1N4002 or similar (very common) 276-1653, pk of 25
3. Start button, if you just have to have it


It's very easy to build, the only tricky part is that you need to know how to wire up diodes. Current flows in the direction of the arrow-shaped schematic symbol. The line on the physical diode (the Cathode) is the cross-line in the schematic. The best thing to do is to cut the leads to about 1/4" long, solder wires to the short leads, then put the diodes in shrink tubing.

Some auto parts stores also carry these relays, sometimes with a nice socket. Without a socket, you just use 1/4" terminals.


How it works:

The Yellow alternator wire provides power to "start" the alternator once the engine is running. With the key ON and the engine not running, the Yellow wire from the alternator is pretty much grounded. (The alternator draws current through the dashboard Battery light.) So, before the engine is started, this side of the relay coil is pretty much grounded.

When the key is turned to start (just bump it to start), voltage is applied to the Red-Wht wire that goes to the Starter Relay, and the engine starts cranking over. Current flows through D2 and turns on the relay, which now has "ground" on the left side of the coil and positive voltage on the right side.

The relay contacts close and current flows through D1, keeping the Starter Relay fed with power, even though you have let go of the ignition key. Hence, "Crank and Hold".

The instant that the engine catches, the RPM's zoom up and the alternator starts charging, which puts +14 Volts on the Yellow wire. Since the relay now has the same voltage on both sides of the coil, it shuts off, and turns off the starter.

If you have a Start button, it turns on the new relay, and you can of course take your finger off of it while the engine starts "automatically". No voltage is sent to the Starter Relay because the D2 diode doesn't conduct current in that direction.

If the engine is running, pressing the Start button does NOT turn on the relay, so the starter is not engaged. And THAT is how to protect your starter and engine without the need of a separate switch.

Power feeding D1 MUST come from the ignition circuit. I put my relay in the trunk because it was easy to get to two of the three wires there, I just had to splice into the Yellow wire in the engine Relay Block and run it into the trunk.

I spliced into the ECU "B+" wires so that Crank and Hold is disabled if you pull the ECU fuse. If you were wondering about D1, it's there to keep from sending voltage back into the ECU if the fuse is out or blown. For instance, if you want to work on your engine and jog the starter a small amount, just pull the ECU fuse and the "Hold" feature is disabled.

If you put the relay under the dash, you just might need a switch to be able to turn off the "Hold" feature when you need it. Or, if something breaks, like your alternator belt, and your car won't stop cranking.

If you only want to interlock the button so it can't work with the engine running, use the more simple bottom schematic.


or i could just use the toggle switch and press start lol

lol idk if its not too much money ill probably get it just because its toyota lol Sirc03-01-2006, 02:33 PMHahaha...

toggle switch ftw! Mr Deuce03-04-2006, 03:32 PMcanadam- any luck finding a part number or price? lemme know

i might be picking up a s2k start button if its too much canadam03-04-2006, 03:52 PMCarson Toyota, who usually has very competitive prices offers this part for $190. I think that will turn most people away from it :) V6'er03-04-2006, 09:55 PMI could have custom-engraved switches made for 20% of that bullsh!t price. canadam03-04-2006, 10:03 PMgo you !

would they have toggles ? :D:D:LOL: Sirc03-05-2006, 07:54 PM:lol: at toggles.

Yes, can we get them with toggle switches V6'er? Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.