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[KJO]

Low field of vision comes up on the mid intermittently. The message will then clear for a short while and then return. This may happen 2 or 3 times in the same 1/2hr journey. When I turn the ignition on I can hear the self leveling motors working. Is this just an erroneous fault message or is there a real fault and if so what is it and what's the solution?

[05omegav6]

Turn the steering full right lock, and looking behind the N/S front wheel you'll see the sensor attached to the wishbone. If it's hanging off in any way it needs reattching. If all ok, the check the rear one, again nearside, but car will need jacking to see it clearly.

Most likely you'll find the issue there

[chrisgixer]

Fault message means a fault.

The head lights usually adjust to low on the motors, hence low field of vision warning, so you'll not see as far on unlit roads etc, but won't dazzle other drivers either.
This is the default state until the fault is rectified.

First place to look is as Taxi Al says.

[Entwood]

Low field of vision comes up on the mid intermittently. The message will then clear for a short while and then return. This may happen 2 or 3 times in the same 1/2hr journey. When I turn the ignition on I can hear the self leveling motors working. Is this just an erroneous fault message or is there a real fault and if so what is it and what's the solution?

absolutely nowt to do with the headlamps .. two totally separate systems with independent sensors

[Andy B]

Low field of vision comes up on the mid intermittently. The message will then clear for a short while and then return. This may happen 2 or 3 times in the same 1/2hr journey. When I turn the ignition on I can hear the self leveling motors working. Is this just an erroneous fault message or is there a real fault and if so what is it and what's the solution?

absolutely nowt to do with the headlamps .. two totally separate systems with independent sensors

headlamp levelling motors can also produce the same low field vision fault 

[martin42]

Seems like these threads are getting more common than tyre threads 

[Entwood]

Low field of vision comes up on the mid intermittently. The message will then clear for a short while and then return. This may happen 2 or 3 times in the same 1/2hr journey. When I turn the ignition on I can hear the self leveling motors working. Is this just an erroneous fault message or is there a real fault and if so what is it and what's the solution?

absolutely nowt to do with the headlamps .. two totally separate systems with independent sensors

headlamp levelling motors can also produce the same low field vision fault 

The ONLY thing that produces that fault is the headlamps .. absolutely nothing to do with self leveling pump he is hearing .. which does not give any fault codes at all !!

My point is .. he seems to think the two are linked as he hears the self levelling . ....

If he means he has listened to, and has heard the headlamp leveling motors .. which involves your head under the bonnet very close to the lights .. then I'm wrong .. but that's not how I read his post !!!

And if he can hear the motors moving but the lights are not .. then he has just found the fault .... busted adjusters ..

[05omegav6]

Busted adjusters won't flag up a low field message If the motors move the system is ok and working... the ecu doesn't know or care that two bits of plastic are broken

The low field message is either the motors or the sensors. If the motors move when the lights are switched on, that is a self test, which confirms motor function and points to a sensor fault

[KJO]

I've checked the sensors and they are attached ok. Also I've replaced the plastic adjusters with the aluminium ones

[TheBoy]

In order of commoness (is that a word?)

Sensor unclipped (NSF wishbone)
Levelling motor(s)
Sensor failure (NSF/NSR)
Wiring worn through near ECU

Anything else is very rare.

[chrisgixer]

Head light level motors got water in/rusty?

[TheBoy]

I've checked the sensors and they are attached ok. Also I've replaced the plastic adjusters with the aluminium ones

Not relevant to this fault

[mandula]

Hello and thanks having me in this forum!

I have problem with self leveling system on my Xenons.

I can hear motors to do something when I switch ignition on (but don't start the engine) and run to the headlights. Also I can feel motors to do something when I place my hands on both headlight glasses. Lights won't move, however.
Inner part of headlights (when I was replacing high beam lamps) did move about 1-2 cm in any direction, so adjusters must be broke.

I also checked fault codes with "My Naff Code Reader":

B3420 - Rear Car Level Sensor, Signal Low Input
(00) - Present

And checked from measuring blocks these:

Power Supply,12.3 V
Engine Start,Inactive
Low Beam,Off 0V
Vehicle Speed Input,0 km/h
Front Car Level Sensor,3.5 V
Front Suspension Compression/Rebound,- - - Steps
F. Car Level Sensor Basic Position (Front),3.5 V
Rear Car Level Sensor,0.0 V
Rear Suspension Compression/Rebound,- - - Steps
R. Car Level Sensor Basic Position (Rear),2.3 V
Left Servomotor Function,Inactive
Left Servomotor,2.9 V
Left Servomotor Basic Position,3.0 V
Right Servomotor Function,Inactive
Right Servomotor,2.9 V
Right Servomotor Basic Position,2.9 V
Telltale (Check Light),On

So, I must have rear sensor dead, or is it harness that could cause this?
 - R. Car Level Sensor Basic Position (Rear),2.3 V <-- is this some programmed value that ECU uses as reference?

Thanks for any answers!

[05omegav6]

First check... Is the arm still attached? It's on the nearside between the sill and the trailing arm...
Second check... Is the wiring broken in that area?

Have suffered from both on mine.

If arm attached and wiring sound, then the sensor itself is toast

[mandula]

Yep, checked arms and cleaned connectors. Wiring seems to be OK, protect shrinking sleeve is broken near connector end, but I tried to wiggle wiring and nothing happened.

I don't have voltage meter near, but I'd like to measure the connector and see is the wiring OK. What reading should I get from connector end of wiring if it is OK?

I've checked also from Live-data with my *shall-not-say-my-program-name* program and rear sensor voltage does not change from 0.0 V when I move the sensors control arm.

Is the sensor part# this: 9117094 ? Tried to search them from ebay, only couple of used ones found and doubt would they last very long..