I finally got Nav running (was waiting on a disk) and it "sort-of" works. I am getting sat signals, but the unit is not receiving/using gyroscopic information. Does anyone know where the nav gets this info from? Is it in the DVD drive (the gyroscope) or is it getting data off the PSM? I can tell its this because the car doesnt know its turning until the GPS signal shows it is (which is about 15 seconds after I turn.
Wow... this is a new one. Since all connections are fiber optic, maybe this is something that needs to be programmed?
- Suneet
If the DVD drive doesnt contain its on gyroscope (and the car gets data from PSM) then it might be.
Any nav systems (GPS-based) with which I am familiar require an external heading source, magnetic or gyro compass, for instant direction. Most rely on the establishment of a direction line by the GPS position system, just as they rely on the direction line for speed determination. Thus the time lag. I had not heard of any compass system associated with the PCM. The behavior you observe is probably normal.
Marty
A 15 sec. delay on indicating a turn is definitely not normal. The turn function is quick in my factory installed unit. Turns are indicated on screen within seconds of turning and making a wrong turn while using the route guidance feature results in almost instant (within 1-2 seconds) do a U-turn instructions.
Something is definitely wrong with it. Because the car isnt exactly aware of its heading, the nav constantly corrects itself for what road its on. I can tell its getting speed data, because if i make a turn onto a side street, then begin to accelerate, the arrow accelerates down the road i was previously on, then a few seconds later, figures out (based on GPS) I am on a different street, and corrects the map.
If I can figure out where the car gets heading/gyroscopic data, I can determine if my DVD Nav unit is the problem, or if the car needs programming of some sort. (it could be getting speed data from the MOST bus because the Bose radio "audiopilot" probably uses car speed as a calcuation factor)
Fifteen seconds seems a bit long, when I think about my GPS response, but it is several seconds, maybe five, and may be speed dependent. Does the Porsche unit have a menu adjustment for sampling rate? Some marine GPS units do, and that will affect response time. But I still doubt that there is a gyro involved in the nav unit. The aftermarket units (Garmin, Tom-Tom, etc.)surely do not.
Marty
Have you looked into ensuring the unit has been calibrated? IIRC, it sounds very much like this was not carried out.
Regards
Popolou
Update:
I went to the dealer today to get it properly coded to the car. It still exhibits the same symptoms. There were no fault codes; everything seems to be working appropriately.
They didnt know where the car gets gyro/accelerometer data for the nav(either from PSM sensors or a gyro built into the navdrive), but told me to call next week and perhaps they can investigate. I have a feeling its in the nav unit and mine is broken.
I wish I had access to another DVD drive, I would be able to figure out what the problem is.
ANOTHER update!
I took the Navigation drive out of the car and disassembled it. There IS a gryoscope in it, made by Panasonic (thank you google!) I'm assuming its broken; fortuneately its on a daughter board and is not surface-mount soldered.
Stay tuned..
And the solution was........................????
