Xenon lights issue

[100K+]

In Nov last year I had an issue with my headlights in that they shone only about 10 foot from the front of of the car (2004 V70R).
With a bit of fiddling ( jacked the whole rear of the car) I managed to do a Sum recalibration with a DICE and all was well. ( when I tried to do a sum cal initially the computer told me the rear sensor readings were incorrect- I read on Swedespeed if you jack the car the matter is fixed, and it was)

Last night I noticed that the lights had dropped back to just infront of the car again and I don't know why any suggestions...?

I can always re jack the car again etc but I would like to get at the root cause.

Cheers

Bob

[100K+]

Checked again with VIDA/DICEthe LH & RH position sensors - diagnostics/vehicle communication/SUM/parameters) and have 3.66v and 1.54v respectivly.

However in diagnostics/vehicle communication/REM/parameters
-signal from position sensor xenon lamp = 0v ( it should be 1.7v-3.2v)
-status position sensor xenon lamp = Not calibrated

Its English, but a bit Gobbledegook to me.

As yet I have not raised the rear to recalibrate the SUM, because I have not found a reason how things have gone wrong since it was supposedly recalibrated in Nov 2012

Are the position sensors at fault, ie reading high/low and would changing them fix things, or would new sensors still give the same voltage readings

Where is the position sensor thats reading 0v

ANY input would be appreciated.

Cheers

Bob

[100K+]

[QUOTE=However in diagnostics/vehicle communication/REM/parameters
-signal from position sensor xenon lamp = 0v ( it should be 1.7v-3.2v)
-status position sensor xenon lamp = Not calibrated

Its English, but a bit Gobbledegook to me.

[/QUOTE]

Explaination for the above??

It would appear that the level sensors on a 4C vehicle communicates directly to the CEM via the SUM

Vehicles that are not 4C BUT have Xenons which may/maynot be auto height adjusted communicate to the CEM via the REM

As my car is 4C the position sensor voltage would be 0v and the position sensor would read not calibrated.

Make sense??
I also now have a target to aim for when lifting my car to get the rear sensor voltages within range (1.7v-3.2v)

Cheers

Bob

[100K+]

Been messing around again trying to resolve these Xenons without throwing money at the job.

When doing the SUM recalibration with DICE the position sensors read :
RH 1.59 Volt
LH 3.69 Volt
As I had live data, decided to Jack the rear of the car up slowly until the SUM would recalibrate and not give the error message "signal too high"

At
RH 1.95 Volt
LH 3.51 Volt

LH signal too high

At
RH 1.95 Volt
LH 3.48 Volt

SUM accepted recalibration and lights now shining down the road as they should.
In fact as I turned the manual adjusters right down before the recalibration, I have lots of lift still to play with.

I'll just see how long it lasts, as I'm now back where I was last November.

Hope you got yr issue fixed too sprintman

Cheers

Bob