Speed Sensor Wire
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Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
Speed Sensor Wire
I got a nav unit from my friend. Well its nice but a little older. Its a Kenwood 8" LCD screen with the nav addition. Well I got the unit all wired up and just got 1 question. I need to hook a wire up for the speed sensor. I know its on the rear diff but is there an easier place to pick up that wire? Or what wire im supposed to be looking for? I have all the wiring under the dash and if that speed sensor wire comes up under there somewhere for the speedo can I pick it off that? I got this from a friend but cant seen to find the gy/bk wire. Anyone know where it is?
Cargo Master
Joined: Jun 2001
Posts: 2,571
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From: Oxford, Indiana
Pull your instrument cluster out. It will have three plugs. The gry/blk wire is in the smallest connector in the center for the speedo. Probably the easiest place to tap it. Plenty of wire up there. You can also pick it up pretty easily at the connector on the cruise control servo.
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From: Belle Mead NJ
Ugh I got bad and good news. Well it worked and didnt. The speedo thing on the nav worked said I was going 100 when I was doing 50, and with the wire hooked up the trans was shifting super wierd. So I unhooked it and took it for another test drive. Trans all better. Humm I wonder why that happened.
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
The gy/bk wire is a output, maybe you want to tap one of the inputs to the PCM. Input to PCM and to the nav unit.
Or maybe it needs a diode in that wire to the nav unit so it doesn't back feed the system and interfere with the tranny shifts and reads the right speed?
Not a electric engineer so, just a "guess" so take it with a grain of salt......
Being "used" you may not have got "all of it", do you have the manual for it?
Or maybe it needs a diode in that wire to the nav unit so it doesn't back feed the system and interfere with the tranny shifts and reads the right speed?
Not a electric engineer so, just a "guess" so take it with a grain of salt......
Being "used" you may not have got "all of it", do you have the manual for it?
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Posting Guru
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From: Belle Mead NJ
I got the online manual. There is a diode built into the wire with a note not to cut the wire. So thats all intact. Yea i got to reread the manual and see what it says. I know it was in an SUV before I got it. So thats prob the speed difference. You can calibrate the speed but I didnt want to mess the trans up so I stopped. I got it from a good friend of mine and its all there.
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
<i>I got it from a good friend of mine and its all there.</i>
Yea I seen that, thought there might have been a chance they sniped the wire just before any diode or what have ya by accident just not noticing it was there.
The manual should tell you what wire to tap depending on the model its installed in. Like remote starters I'd think it would have a chart showing all that available online.
And no, no "gadget" is worth a toasted tranny!
Yea I seen that, thought there might have been a chance they sniped the wire just before any diode or what have ya by accident just not noticing it was there.
The manual should tell you what wire to tap depending on the model its installed in. Like remote starters I'd think it would have a chart showing all that available online.
And no, no "gadget" is worth a toasted tranny!
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Anyway I'd think you'd need a input wire, not a "output" from the PCM. A input wire to the PCM reporting the signal from the VSS. Tap it and I think you'll find it works.
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Posting Guru
Joined: Aug 2007
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From: Belle Mead NJ
Now I just got to find that wire. I wish it was just a plan Garmin or Tomtom. Stick to my windsheild and be done lol. Guess I can use the LCD to watch dvd's or something lol.
Fleet Mechanic
Joined: Nov 2004
Posts: 1,324
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From: Michigan
Mine has a test connector under the hood, right by the EEC diagnostic port. Left fender, right in front of driver. It's a 2 wire plug and is the same 2 wires that come off the RABS. I used this when troubleshooting a bouncing speedo. I hooked an oscillascope up to them. It is a direct connection to the vss.
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