E39 Prewired for Navigation?
 

I have a E39 2001 525i Exec with the following:

1. Widescreen Display

2. TV Tuner

3. CD Changer

I was wondering if the car would be prewired for navigation? It seems stupid to sell a car with just a TV and no navigation drive.

If i look in the back i can see a random power plug that has not been used, but i'm not too sure what i'm looking for.

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No, you have a car that was spec'd by a skinflint so only has the TV option.

You can have the nav as well, but you loose the TV, if you get the TV jump up loom (£60 from dealer), then you can have both.

To have both;

Buy the jump up lead.
Disconnect the blue lead from the TV module,
plug the blue plug into the jump up lead, plug the white and blue in to the TV and the other blue plug into the nav unit.

Now, you will need a 26pin plug to plug into the purple socket on the back for the nav unit.

You will need +12v
Audio out and
a wire from the dash (wheel sensor)

I have the pin numbers somewhere.

Running without these will not effect the nav working (it will work), it will just have no sound from the nav and the pointer on screen will not be smooth.

Not really sure abut that, if you can find what they are for, then the could be for the nav part.

HTH

Is there a way i could tap into the sound through the Radio Tuner instead of running a new cable from the back to the front?

Also there seems to be an empty white plug on the top of the tv tuner, whats that for?

Where do i get the 26 pin purple plug from and what does it plug from- into?

I think i have the 12v plug in the back of the car already ( the random plug that has not been used )

Where does the audio out come from, like the front screen or the radio module?

I just took the back seat off to see if i could see anymore cables, heres some pics from what i found.

Not to sure if these are of any use, but will post them anyway.
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The sound does go from the nav/tv to the radio module (in the boot), the only thing that comes from up front is the wheel sensor wire.

BTW the front display/monitor is just a dumb screen, all the gubbins are in the boot.

Audio in/out, mine has the AV AUX lead plugged in, the jump up lead has a white plug on it.

Get one of the 26 pin (I think) generic plugs and cap from the dealer, you will need to populate the wires (yourself) with +12v, nav audio out and the wheel sensor.

You will need a GPS antenna too btw.

OK, you could use that as one of the inputs.

Nav audio come out the nav unit and goes into the nav input on one of the small plug that plug into the bottom of the radio module.

Ok, thank you for helping me out on this, its fantastic,

Just three more questions, what does the wheel sensor cable plug into up at the front of the car?

Can i just mount the GPS antenna inside the rear compartment where all the gubbins are?

So i have to create my own purple plug using a PIN chart which will include the wheel sensor and a 12v? Do you have the PIN chart by chance?

Do you know of an online site that i can purchase the JUMP from? If i decide to get rid of the TV, i can just use the cable thats plugged into the TV tuner yes? And when im plugged straight into the MK3 it will use that as the brains of the unit... not the TV tuner that its using now?

No problem.

I think... its the white plug that plugs into the cluster and you need to tap pin 8 (black/green stripe).

yes, but it really needs to "see" the sky.

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You need

1:= reverse signal
3: = +12v
10: = speed sensor (from pin 8 on cluster)

I got mine from ebay.de (it was cheaper than the dealer).

Yes, plug the blue into the blue, and it will see the nav and not the tv.

Correct.

Sorry, these questions keep popping up in my head,

Could i tap the speed sensor further down the cable which is easier to get to? like the speed sensor may run down past the rear wheel? could i just make a small cut in the shielding and jack the line with another cable?

I have been looking around onlike for the jump up loom can't seem to find it anywhere including ebay

Could i do the same for the 12v just tap into another 12v cable going to the the tuner or radio module? do you know what colour the 12v would be?

Would my 2001 X5 which came with factory fitted navigation have a JUMP that i could test out on my 525i?

And whats this Reverse signal?

thanks

You could, but thats he OEM tap in point.

I would take the +12v from the rear, as for colour you would need to use a meter to find one.

No, factory nav has the TV in an incorporated loom.
For when the car is in reverse, so that the nav "knows" you are going backwards.

What colours the reverse pin and where can i find that, do you know where the sensor is located so i can tap into it rather than the front dash.

Also you say a 26 PIN purple plug... but i only see 18 pins in the pinout

Tap the reverse light switch (gear knob).

No, sorry.

My mistake, 18pin plug and cap.

Am i tapping one cable or two for the reverse light?

Not sure mate, my retrofit loom just plugged into the OEM looms plug and play.

I think kiwi knows where to find the speed wire in the trunk. Ask him or do a search for his post on this. The big white plug with the 4 wires I think is X1532 and pin 1 is the RT/GN power and goes to nav blue plug (X1313) pin 1. Pin 2 BR is ground and goes to blue pin 10. Pin 3 is I-bus WS/GR/GE and goes to blue 3. Usually the adapter cables have a mate plug to attach to X1532. Go to Google and search for WDS and spagetti as it is a site that has the WDS wiring info, other sites for WDS also. When there you can look up your car. The Items of interest are A112 Nav, A197 video module, N9 radio etc. The nav antenna is cheap on ebay. Autotronics is an expert in OZ and kiwi another expert in Switzerland ex NZ and he knows a lot about e39s in OZ and NZ. You may want to investigate the cables with the following P/Ns as they may be of help. 61 12 9 413 963, 61 12 6 907 842, and 65 90 0 017 296. Also ask your Dealer parts guy to look up the installation instructions on his computer for you and see what they show as they may help P/N 01 29 0 028 309 and 310.

All others rview my post and correct any mistakes.

KIWI tells me that i do not have to run a cable up to the dash as the Speed Sensor and the reverse sensor are up the back attached to the radio unit.

Is this the case?

Any update on this?

You can do this much easier:

Reverse signal: take it from the reverse light in the taillight cluster, it is right behind the nav location. Tap into the reverse light wire.
It is the same as the reverse signal from the LCM, except for the rare occasions when reversing with a trailer attached, and with the original trailer wiring control unit fitted (because then the reverse light is turned off)

Wheel pulse: if you have EDC, then take it from the EDC control unit behind the battery. With no EDC, you can use the averaged wheel pulse (slightly less accurate but works) from the radio module, right beside the nav

This way all the work is in the boot, you don't have to run any wires to the front of the car at all.

These may help you

Apparently i only need to do this if i'm worried about using the car in an underground carpark or something like that, where there is no GPS signal.

Is this true?

Just do it properly and use the reverse and wheel speed signal. If you dont you will only regret it.

Yes you could 'manage' without them, but the nav computer uses signals from these plus the gps and the gyro to give a smooth display. It's not just underground carparks, it's in bad weather too, or tunnels, or in built up areas.

Its two wires, spend the extra 30 minutes doing the job properly. Dont bodge it. I've given the wiring diagrams, plenty of people have said the easiest location to get the signal sfrom so please take the advice.

The speed pulse is needed for dead reckoning

Dead reckoning is used...

for the first seconds to minutes after switch on before a GPS signal is acquired (you can easily drive 1km in this time)
under bridges
in tunnels
in underground carparks
in built up cities with many skyscrapers and poor satellite reception
in very bad weather with weak GPS signal
and many other situations where GPS signal is interrupted.

Use at the VERY LEAST the speed pulse!

The reverse signal is only for when you go backwards.... but that is so easy to connect, there is no excuse for not using it.

No Dead Reckoning = Disappointing GPS performance

With Dead Reckoning = Perfect GPS Performance

You choose.

I've never gotten lost while reversing into a parking space. :D

But if you dont wire the reverse signal in, the map would flip round each time you reversed, then rolled forward, then reversed (like reverse/paralell parking)

Its one wire, right next to nav unit - i dont understand why there is such a big discussion. But then i've always been one to do a job properly!

Jochen is right, initial time to find a satellite fix can be considerable, and with speedo/wheel signal your nav computer will be useless for that period, instructions will be rubbish. I experienced this last week in my own car (E38 nav retrofit), it was embarrassing. Then, I connected up the speedo signal (TAA), and I was very impressed. I suddenly had navigation directions immediately available upon entering the car, prior to getting proper GPS fix! The nav computer's tracking based on speed signal, compass, & gyros is quite amazing. It really was like another upgrade to my nav. Love it.