[stjohnsmythe]

I'm putting in a single din Blaupunkt sat nav unit and it needs a speed signal.

I've found this piece of info from another website:

'[FONT=&quot]easiest place to pick up speed signal is Brown/Yellow wire from HEVAC ECU as it's just below radio aperture, but there should already be a speed sense wire to the existing radio head unit, a Yellow wire, but this would depend on which MY and grade of radio i.e. low line, mid line or hi line, you can check in electrical troubleshooting section of Rave specifically C0793 of HEVAC or S218 of Radio head unit these are fed from C1279 of BECM,'

I've searched my version of RAVE and can't locate some of the info. Can anyone verify if the brown/yellow wire from the HEVAC is the same on all models? as I'd just use that. I have a 1999 SE.

Cheers
[/FONT]

 

[wammers]

Brown/Yellow wire from pin 5 Hevac to pin 10 BECM has a link to radio and navigation system on 99 model. None before that. There are two Brown/Yellow wires, only the one to those pins has the link.

 

[stjohnsmythe]

Brown/Yellow wire from pin 5 Hevac to pin 10 BECM has a link to radio and navigation system on 99 model. None before that. There are two Brown/Yellow wires, only the one to those pins has the link.

Cheers.

I've actually found out that the unit is perfectly happy with just the GPS signal so I won't bother with the speed input.

 

[palace]

now I have retro fitted a Landrover sat nav but the one wire I cannot get a signal from is the speed sensor wire I was told it is the yellow/red wire that is on pin 10 in the BECEM I tapped into that but am not getting a speed reading from it. With nanocom I can see my on road speed so it must be working else where. So what other wire can I tap into for the speed sensor ?
P38A 2002 HSE

 

[TCubed]

Why is there a speed wire going to the HeVAC and radio?

 

[JohnnyCrash]

Why is there a speed wire going to the HeVAC and radio?

Faster you go louder the radio

 

[johnseedee]

I have just done this and found this useful reference elsewhere on this site:

Speed pulse for sat nav ????


It is connector C0233 pin 9 (yellow). This is the 20 pin connector on the right side of the instruments and easy to find once you have removed the instrument cowl.

 

[MrGorsky]

Why is there a speed wire going to the HeVAC and radio?

As you slow down, the fans speed up to keep the temperature constant.

 

[Datatek]

As you slow down, the fans speed up to keep the temperature constant.

They do? The speed sensor is required for GPS.

 

[MrGorsky]

They do?

Mine do, so long as the HEAV is set to auto.

They also slow down as I speed up....there is a small delay.

 

[Datatek]

Mine do, so long as the HEAV is set to auto.

They also slow down as I speed up....there is a small delay.

I never use auto, it has a mind of it's own, never does what I regard as useful, much better on manual IMO.

 

[TCubed]

I never use auto, it has a mind of it's own, never does what I regard as useful, much better on manual IMO.

Sounds like you have something slacking there then Data

Mine held the temperature to within 0.5°C when I was overly scientifically demonstrating climate control to a friend last year

 

[Datatek]

Sounds like you have something slacking there then Data

Mine held the temperature to within 0.5°C when I was overly scientifically demonstrating climate control to a friend last year

Not interested in it holding the temperature constant, it doesn't help when the sun is shining on you body and I don't like the fan speed going up and down on it's own, I find it distracting.

 

[palace]

I have just done this and found this useful reference elsewhere on this site:

Speed pulse for sat nav ????


It is connector C0233 pin 9 (yellow). This is the 20 pin connector on the right side of the instruments and easy to find once you have removed the instrument cowl.

I tried this and the speedo stopped working and the GPS still didn't work
so then I cut it off speedo works still no GPS what next which is the hevac wire to the speed sensor ?

 

[johnseedee]

Sorry you are having problems, but glad that no harm has been done.

I have to say that my experience is based on VDO Dayton sat navs - basically, the same as the oem units - but I wouldn't expect the Blaupunkt units to be significantly different.

The speed sensor wire from your sat nav shouldn't have a resistance/impedance small enough to load the speedometer input (and stop it working). It may be time to check the wiring and look for shorts. The VDO Dayton units have two speedo inputs - one for electronic speedos and one for an adapter for mechanical units. Is the Blaupunkt unit similar? Do you have the right wire?

Was the speedo the only instrument which stopped working with the sensor wire connected? If it was, then it sounds as if you had the right connection at the speedo, but the lead from the sat nav was loading it too much!

You say that the GPS doesn't work. The speedo signal should just provide additional information for the GPS. It shouldn't be essential to the working of the sat nav. If the sat nav isn't working atall then I think that you have a more basic problem.

I don't think that tracing the speedo wire to the HEVAC unit will help, because it will be from the same source. All of the wiring diagrams are available on RAVE, of course.

 

[johnseedee]

Sorrry, I just re-read the whole post and realised that you are fitting oem sat nav and not Blaupunkt. Please ignore those comments.