Where is the speedometer wire?

[Kevin M.]

Just installed a NAV unit with my Stereo system, and I am in need of the location of the speedometer wire.. I recall it being under the drivers seat..

Thanks Loren!!

[Loren]

Kevin,

Do you mean the Speedometer A wire or do you mean the reverse wire?

I thought the Nav needed the reverse wire?

[Kevin M.]

Its actually calling for both... Reverse wire and the Speedometer wire... not sure what your referring to as "A" wire

[Loren]

The reverse signal wire is under the drivers seat (see diagram). Look for a spot weld with several BK/BL wires. These wires are the reverse gear signal. You will need to splice into any one of these wires and then insulate (tape) well. They recommend running the wire from the Nav through the side panel and up the A pillar -- but I know folks that have run it up the center console.

Speedometer A signal is the speed from the instrument cluster. It is the same signal used for the PSE. The easiest place to get this is Relay Support 1 (the relay panel down by your left foot), Position 23 (bottom row, first relay on the left), Bridge Support Connector 1. The Speedometer A signal is the GR/PK wire.

[Kevin M.]

Great Loren!! Do you think its necessary to hook up the reverse wire? Does that just tell the NAV that your going backwards?

[Loren]

Correct. If you do not connect the reverse wire then your distances/directions may tend to be "off" by some amount. I would connect it and run the wire under the center console.

[Kevin M.]

Thought so.. thanks Loren.. Does anyone have a good picture of the wires under the seat I will try to take some when I do this..

[Kevin M.]

Wow for the life of me I couldn't get the relay panel out... it seems the left side is locked in somehow, Toolpants whats the trick on that one?

Loren the picture from under the seat, I assume thats coming from the main box under the seat, not the wiring harness that are mounted to the seat.. the only way to get that box is to pull the drivers seat out? All for a reverse wire... hmmm Any thoughts guys?

Box under the seat..

Edited November 25, 2003 by Kevin M.

[Loren]

Relay Box --

1) Remove the fuse panel cover and the carpet cover itself by removing four screws. Release the relay carrier above the fuse panel by releasing a clip on the left and a 10mm nut on the right.

2) Pull it down so you can rotate it around to see the back.

The seat comes out easily if you have the E12 External Torx socket -- 4 bolts. Don't forget to disconnect the battery -- just in case.

[Tool Pants]

For the speedometer signal you can use the gray wire with a pink stripe that is in the connector to the back of the oem radio. It is used for GAL.

There is an unused reverse signal wire under the drivers seat next to the control box. It is black with a blue stripe. You are going to have to move the wires around and remove some tape to find it. It is a stub of a wire going nowhere with a black plastic cap on the end.

If you want to remove the relay tray. Remove the 10mm bolt on the right side. The left side is held in place with a plastic lever that you push on. Get a light up in there and you will see it.

[Kevin M.]

Awesome!! Ill look for the wire from the stereo.. Do you think I can get to that wire without removing the seat... It looks like it will have to come out... maybe I just wont ever go in reverse :)

[netrophile]

HI.

I just put in a traffic pro. I was going to do the reverse wire like you but decided to leave it for another day in the end.

I have not noticed any problem with the sat nav despite this ommisssion. I really dont think I will bother with the reverse signal now.

Hope this makes it a bit easier for you to decide :)

Good Luck with the install

[Kevin M.]

Thanks!! That is goood to hear!

[Tool Pants]

Looks like we are going to be working on cars Saturday. Drive over and we will hook it up.

[Kevin M.]

Looks like fun!!! Lets meet at Chads in Modesto :( San Jose is 2 1/2 hour from me...

[Tool Pants]

I think Chad likes to drive. From Modesto.

[Kevin M.]

Hey that Gray and Pink wire was the one!! Easy to get to.. I passed on the reverse wire for now... Thank you!!!

[Loren]

Hey that Gray and Pink wire was the one!! Easy to get to.. I passed on the reverse wire for now... Thank you!!!

Wimp! ;)

[mattmarsden]

Loren,

Do you know if the reverse wire is under the passenger seat in a RHD car?

[Loren]

Loren,

Do you know if the reverse wire is under the passenger seat in a RHD car?

Should be a Black/Blue wire under the drivers seat.

[Scouser]

In my 2000 C2 Cab, the speedo A wire was already in the CDR-220 head connector wire loom. This connector is the ISO connector that clicks into the head unit. It was already there for me in the loom ;)

[C4C_Leon]

Loren, Toolpants,

For a 2002 with PCM, would it be the same Grey/Pink wire that carried the speedometer info?

Do I have to unscrew/remove the PCM unit to get to it?

I am installing a Bahntech Top Control module and would like to tap into the speedo wire to prevent top from operating > 25mph.

Also, how do I disable the parking brake requirement for the top?

[Tool Pants]

According to the wiring diagram there is a black 26 pin connector on the back of the PCM unit. Position 24 is the speed signal wire which is grey with a pink stripe. You hook the blue wire from the Bahntech to the grey/pink wire.

I do not think you can get to the wire without removing the PCM unit.

I know how to defeat the parking brake requirement on a Boxster, not a 996. See if Loren has an idea for a 996. There was a thread some time ago about grounding a wire from the top control unit.

[C4C_Leon]

Tnaks Toolpants,

I think I found the right one.

Now to test it I will have to disable the speed sensor wire going to the top module in the back of the car.

[Hroussard]

What is the location of the "work place" on Saturday in San Jose?? As I am in Foster City I may want to come down and meet some of you !