mk3 - mk4 upgrade problems

tweakerwes · #1 10-20-2006, 08:56 AM

i've upgraded my mk3 with a mk4 from ebay.
i've noticed some problems with it.
My position is not acurate, sometimes i'm driving of the road on my gps.
My car is 100m after on gps screen.
But ive noticed that if i start my car the position is good.
But when i'm start driving the problems begin.
I have 6-8 satelite on my gps.
What are you guys thinking it will be?
Now i have disconnected my battery for doing a reset.

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janafunk · #2 10-20-2006, 11:25 AM

It should not be anything to be worried about.

This does happen quite often as the GPS unit needs to build up an alamac of the local area's satellites......this can take a few days.....

I would say..that hopefully after a week of driving around.....it should sort it self out......

if it doesnt then there is a calibration mode that you can do!

tweakerwes · #3 10-20-2006, 01:43 PM

Quote:

Originally Posted by janafunk

It should not be anything to be worried about.

This does happen quite often as the GPS unit needs to build up an alamac of the local area's satellites......this can take a few days.....

I would say..that hopefully after a week of driving around.....it should sort it self out......

if it doesnt then there is a calibration mode that you can do!

Thx, gonna see what happens in a week.
How does the calibration mode work?

trapdoor · #4 10-20-2006, 02:39 PM

Go into the Service menu and select the option for Check Sensors.

Whilst driving, check that the WHEEL SENSOR increments/decrements whilst moving - this is a vital sensor that works in conjunction with the GPS and accelerometer to keep the on-screen indicator synchronised with your absolute position.

GPS is accurate, but whilst moving not THAT accurate - therefore the Mk4 uses several external sensors on the car to vastly improve accuracy.

How do I know? My Mk4 system had one of the wrongly wired harness looms which meant that the wheel sensor signal was not on the correct pin into the Mk4 - after much ranting at the dealer, and providing some info from the net, they contacted BMW UK who diagnosed the issue - one pin was misplaced on one of the two multi-plugs (I forget which pin on which plug).

Once it was corrected, the accuracy of my nav was and still is spot on.

Hope this info helps - if you are under warranty then go back to the dealer. If not, PM me and I will try and find the info to help you determine if this is the fault or whether it is a wheel-sensor failure.

tweakerwes · #5 10-21-2006, 06:53 AM

Quote:

Originally Posted by trapdoor

Go into the Service menu and select the option for Check Sensors.

Whilst driving, check that the WHEEL SENSOR increments/decrements whilst moving - this is a vital sensor that works in conjunction with the GPS and accelerometer to keep the on-screen indicator synchronised with your absolute position.

GPS is accurate, but whilst moving not THAT accurate - therefore the Mk4 uses several external sensors on the car to vastly improve accuracy.

How do I know? My Mk4 system had one of the wrongly wired harness looms which meant that the wheel sensor signal was not on the correct pin into the Mk4 - after much ranting at the dealer, and providing some info from the net, they contacted BMW UK who diagnosed the issue - one pin was misplaced on one of the two multi-plugs (I forget which pin on which plug).

Once it was corrected, the accuracy of my nav was and still is spot on.

Hope this info helps - if you are under warranty then go back to the dealer. If not, PM me and I will try and find the info to help you determine if this is the fault or whether it is a wheel-sensor failure.

i've checked and i can see the wheel sensor changing while driving.
If i don't drive the wheel sensor is 0.
So i don't think there is a misplaced pin of the wheel sensor.
If there was a misplaced pin in the wired harness loom i should have no signals of the wheel sensor.
Or should i have a bad wheel sensor?

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