M35 Stagea Brake Cut Off Mod?

[Whitem35]

Relay will probably work as 0V is normally an earth, but sometimes it is just 0V.

But all is not lost for a dead simple solution. Why not use the Start signal on Pin 42? According to my research, that wire has 9-12V when key in start position & 0V otherwise. Sounds perfect, yes?

Start sig on Pin42.JPG

DIY instructions:

1) Cut wire on Pin55 a few inches from the ECU connector. Strip ECU end & tape up other end.

2) Strip small amount of insulation from wire on Pin42 (leaving wire intact).

3) Solder Pin55 wire (ECU side) onto Pin42 wire & tape up.

Job done

Simple brake wire mod.JPG

Testing & pics are all yours Scotty. I'm not moving mine from where it is as works just fine, but the above is certainly an easier solution....if it performs as expected.

[Whitem35]

Does anyone know what colour combination wire 42 has

[joshm35]

Doesnt matter to me im colorblind. I find wiring fun

[Commsman]

Does anyone know what colour combination wire 42 has

Manual says colour is SB ??

I may have time to check later, but pretty easy to locate it using the ECU pinout diagram. I use the pin positions with NO wires to orientate the drawing.

[Whitem35]

So I tried 55 to 42 with no success, unless I have done it wrong maybe there isn't enough power for long enough to reset cel

[Commsman]

So you already had a CEL before making this connection?

There was some conjecture whether the duration of the 12V start signal would be long enough to cancel a CEL.

However it was hoped that if there wasn't a CEL, the start signal might be enough to keep it at bay. Do you want to cancel it & see if it comes back in next few hundred kms?

[Commsman]

And it that doesn't work, there's always the proven methods.

Bit of a bummer 'cause it would have been the easiest way to do this mod.

[Whitem35]

Cut wire 55 and drove great for a few days before cel came on, I have a scanner which normally resets any cel that appears but in this case it doesn't reset even with 55-42 joined. How hard is it to wire up to reverse lights?, is it just a matter of connecting the wire from ecu to wire on reverse lights??

[Commsman]

Yes, just take a feed off the reverse lights (check for 12V when in Rev, & nothing when not) & put this into Pin55 on ECU.

Nothing else is required. NB, you may still get a CEL if you go for a long highway drive (I can leave home & not stop for 600km+), but under normal conditions you should go into reverse often enough - or stop at R for a few seconds on way to D, if utilising drive in-drive out parking a lot.

[Whitem35]

Would a wire from 55 to 12v source via on/off switch give a similar result if cel comes on?

[Commsman]

Yep, exactly the same.

Essentially I have this setup (as well as reverse lights) via a key switch.

When on it gives me the valet setting, ie 12V on pin55 permanently, to limit throttle.

When off it operates as normal & CEL is kept off by 12V from reverse lights.

If you had a 12V ignition source on a switch, you could leave it on when you drop the car to the mechanic. Then you'd be relatively sure the apprentice isn't going hooning on the test drive

[Commsman]

[joshm35]

What wire number is it. Pin 59 ( 3rd set of pins) is pink with blue trace. 55 (middle set of pins ) is like a red with yellow trace. Is it pin 59 the brake signal in the pin setout a few pages back that I should be connecting reverse lights to??

[Commsman]

Def pink wire with blue trace. I pulled mine apart just now & it is pin 55 in the centre - green plastic block on the connector.

[joshm35]

Might have to catch up sometime soon so I can see what your talking about leon.

[Commsman]

Sure, lol. In the meantime I'll PM you some detailed pics.

[joshm35]

That would be great

[scotty nm35]

Something tells me you are looking at the plug the wrong way Josh.

[joshm35]

Im following the diagram. Being color blind is not helping my course

[joshm35]

Pin 55 is 3rd pin in middle set of pins. (Row with less pins)