Xenon headlights not moving on start up
 

Hi All first post so please be gentle,

2005 xc70 D5

I know that headlights have been done to death but I cannot find an answer to my problem and therefore do not know where to turn next.

MOT failure for d/s headlight high. Strange I thought as they are self levelling. Plugged in VIda and did a SUM Cal. Could see lights move up/down and settled where they had been. Turned the d/s light down 1/4 inch to be on safe side.

Retest failed for no/poor light pattern on P/s and NO Self leveling.:censored:

Admittedly the lenses where in poor state (clouding) so that would account for the pattern. I have cut and buffed them and the difference is plain to be seen.

When car is turned on lights do not move. When main beam is selected the dipped beam can be seen moving (which I believe it should do). Carried out another SUM Cal and both levelling motors can be seen and heard working. Jacked rear of car up and did another SUM Cal and the lights move to a lower setting, tried this a few times and each time the lights readjust unless i had gone too high when the SUM would not complete. From this I believe the position sensor must be ok.

What next?? Any pointers greatly appreciated.

Thanks
Michael

The dipped beams should be MOT checked with them at their greatest height so if the manual or automatic levelling system fails the beam spread is still within the limits - last time MY 2001 V70 which has ordinary filament lamps was MOT'd the tester reset the dipped beam to the greatest height before he checked the beams.

Re the lamps not moving on start-up - do you leave your light switch at the 90° or 0° position? I've found that if I leave mine at the 90° position they do not move at startup but in the 0° position they do. Rotating the switch between the two positions and back resets the motor "condition" and they then work normally until the next start up in the 90°. I'm not sure if this is a "resettable" condition/state in VIDA; I was told it can be indicative of a CEM problem but the only reference that I've found to date was in respect of the "Warning for low beam position (Bi-Xenon)" which implies that it could be a programmable variabel state or condition. Whether there has been a software update at some point which has resulted in the motors not moving on start-up is unclear.
https://www.launchtech.co.uk/common-...(Bi-Xenon).pdf

The list at http://www.launchtech.co.uk/volvo/ has links to the following available technical documents as pdf's

ABS - Calibration (car with DSTC)
ABS - Checking brake light switch adjustment
ABS - Reading off the configuration
CCM - Reading out programmed parameters
CCM - Self-adjustmenet of damper motor end stops
CEM - Calibration of position sensor, GDL lamps
CEM - Daytime running lamps
CEM - Home safe light
CEM - Programming of rear window wiper when reversing
CEM - Programming of short flash sequence
CEM - Reading off and programming vehicle mode
CEM - Resetting crash mode
CEM - Resetting low voltage counters
CEM - Resetting factory settings
CEM - Tailgate wiper (5 door models)
CEM - Warning for low beam position (Bi-Xenon)
CI - Resetting the service reminder indicator (SRI)
Configuration of the siren
CPM - Programming the additional and parking heater
DDM - Initialise the window
Diesel - Reprogramming the optimising parameters (injector class)
Diesel - Reset adaptation of the exhaust gas recirculation (EGR) valve
Diesel - Resetting the adaptation values
Diesel - Resetting the odometer particle trap
DIM Display of the DSTC message
DIM programming distance conditions for service
DIM programming instrument lighting
DIM programming parking brake warning
DIM programming text message seatbelt reminder
DIM programming audible acknowledgement signal seatbelt reminder
DIM programming the engine time conditions for service
DIM programming the time conditions for service
DIM programming the unit for temperature
DIM programming the units for trip computer
DIM read out programmed values
DIM resetting the service reminder indicator (SRI)
DIM testing all displays and lamps in instrument
ECM adaptation of the throttle unit
ECM resetting the adaptation values
General service
PDM initialise the window
REM calibrating the position sensor for Bi-Xenon lamps
Resetting the adaptation
SRS calibrating the occupant weight sensor (OWS)
SRS checking the PAD light
TCM calibration of position sensor
Resetting the counter for transmission oil change

First Amazon community answer =

The lamps are high and low beam.
You will probably have to modify your light cover.
It comes with information for fitting.
All check online for tips in fitting and adjusting led globes.
Good luck
Mr S C A S

(https://www.amazon.co.uk/ask/answer/...Mx8ZGE7B1ZPLPX) answered on 18 February 2018

rear load sensor loose or arm seized up ?

Thanks for the responses

ASt85:- This time of year I generally leave the lights in the on position. I have tried resetting as you suggested but no joy.
Sorry I don't understand your second post as the lights are factory fitted Bi-Xenons (D2R bulbs) with separate main beam (H7 bulb).


Harveys:- I had taken the d/s rear wheel off and watched the sensor arm move as the car was jacked. All seemed ok and the sensor is secure. Surely Vida would not complete a SUM Cal if the sensor was faulty?

I think the reply was probably intended for this: https://www.volvoforums.org.uk/showthread.php?t=278277

Thanks SImon, you're absolutely correct.

I have a 2004 V70 AWD R with bi Xenons. I always drive with the headlight switch at the "on" (vertical) position. My lights always go up and down on start up. I'd suggest that as you can do a SUM with VIDA the rear sensor/s is/are OK. You have correctly identified that by lifting the rear of the car, you can force the sensors to give an incorrect reading which VIDA then will not allow a SUM to be carried out - again suggesting the senors and the SUM are OK. The motors which raise/lower the lights have been confirmed as working. Thus the issue you have I'd suggest lies else where.
One assumes there are no related DTC'S in VIDA ?
Perhaps as ASt85 suggests its stage 1 CEM failure??

Good luck
Cheers
Bob

Is the CEM failure a solder problem like the other module failures?

It is usually caused by a dry joint somewhere in the board, most seem to be in the area of the chip. The solder can be re-flowed by a specialist; there are those who have re-melted their own solder joints using fine point soldering irons.

I'm a reasonable soldering iron user when it comes to components but I wouldn't try doing the joints on a directly soldered chip.