The cigarette lighter plug might have had a voltage regulator in it, and the green wire might be a lower voltage, like 5VDC.. This would usually be built into the device itself, but often isn't. (Jay beat me to that conclusion it looks like)..

If it was a NMEA output, it wouldn't have been on the cig lighter plug, it would have only been on a cable with a serial connector on it.

Oh, another thought, that might have been a tach sense signal, because that can be picked up through the electrical system from the alternator output ripple. Unless there is a voltage regulator in the cig lighter plug though, there would be no reason to have a separate wire for that, because it could be done inside the unit. I really have no idea though.

 

Doesn't matter if there was a fuse. If the green wire was something like a 5V input, the fuse wouldn't have protected it if 12V was applied. Fuses only protect against overcurrent, and they can't do anything to stop semiconductor punch-through from overvoltage.

After a quick google search, there are a few brands that use green for switched ignition, but there would be no use for that on a cig lighter plug. After all, the cig lighter itself is ignition switched.

 

Chris did you hear about the GTR using GPS data to let it know when it was at an approved racetrack facility?

I'd wire in a NMEA replicator (we use them for the Coast Guard), so that the track is everywhere I go. (Well, first I'd have to buy the car, but yeah.)

 

True, hence the question on the M/N of the unit.

 

Yeah, that was one of the first things I'd heard about it because it was so off the wall. Japan has always done wierd speed limiting stuff though, so that wasn't a shock. I don't like the big brother undertones of that kind of technology though.

Yeah, there should be ways to defeat the GPS unlock system, I'll bet that the level of GPS integration is such that it couldn't be easily bypassed though, and that they most likely have their own GPS data format. Integrated systems have no reason to conform to anyone elses imposed standards, which is nice for the manufacturer but bad for hackers. That's actually the reason that no one has successfully hacked Honda OBD2 ECUs; the main microcontroller isn't hard to replace (with a different, currently available type) but there is another expansion microcontroller and the knock sensor board, both of which use a proprietary protocol with the main micro.

I'll bet there are some cool hacks that will come into play with the GTR as time goes by though. People with financial incentive get very, very clever. I don't think the GPS is inside the ECU, and that's still nothing that a protocol sniffer and a logic analyzer shouldn't be able to decipher.

 

Kris wtf didn't you call me I could have done it a special way for you!

 

Hmm... perhaps the easiest way to go about it would be to replicate the standard signal at the antenna end... (I'm doubting nissan has their own satellites.)

Dude, we need to hop on this and make some black boxes.

edit: calling you in a few.

 

I didn't think I could goof up.

Apparently I was wrong.


4 alarm installations, not a single problem.

Hardwire a GPS? Hah.

 

Maaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaapaaaaaaaaaaaaaaa aaaaaapppppppppppppppapapapappppppppp


haha shit sucks dood.

 

BAAHAHA.

Yeah, you heard it.


My GPS now studders.