Headlight leveling system malfunction

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You're reading: Headlight leveling system malfunction

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discussion starter · #1 · jan 16, 2018 (edited)

my wife’s 2006 xc90’s headlights are messed up! they are pointing down and high beams don’t even point high enough to be effective or safe at night. i suspect that it’s something to do with with the level sensor on the rear left suspension so i pulled the wheel off this morning and there was nothing noticeably wrong. vida shows a code in the rear electronic module (rem) which was something like headlight level out of range or something. i tried recalibrating in vida then i erased the code but it came back right away, so i’m thinking the position sensor is faulty. also, i noticed that the headlight level hunts if i’m sitting stationary with the headlights pointed at the garage door….they begin moving up and down both on low beam and high beam.

has anyone else experienced this and if so what was the fix?

thanks in advance

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probably got it wrong, two are noted in vida with separate brackets, seeing that plus the other post plus some other vida verbiage led me to believe that there were two.

sensor

the following applies to cars without four-c (continuously controlled chassis concept)

an inductive position sensor reads the angle between the body and the left rear control arm. the angle is a indication of how much the vehicle is leaning (chassis height) and depends on weight distribution.

the sensor is mounted slightly differently for fwd and awd.

the rear electronic module (rem) reads off an analog signal (+61404532026 v) from the position sensor and converts it to an angle value (±35°), which is sent to the central electronic module (cem).

a fully loaded vehicle generates a signal of 0.5 v, which corresponds to negative 35°.

the central electronic module (cem) regulates the headlight leveling motors (pwm signal) to adjust the headlights vertically.

Read more: 6 Brightest LED Headlight Bulbs 2021 (Reviews + Ultimate Buying Guide)

can get the rest in vida- product description/design and function/function group 35: gdl bulbs

out of the other posts though were a couple of mentions for ways to test, might be worth it to try and use vida and/or moving the sensor with someone watching the lights as there are a few mentions of a “sweet spot” (range) in which calibration is successful. just a thought.

and certainly might be a problem with rem but sensor seems more intuitive and you have the tools to do it with vida.

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discussion starter · #6 · jan 17, 2018

i just checked voltage coming from the position sensor using vida and i’m seeing intermittent voltage of 0-2.3v while stationary on flat ground. i should be seeing steady constant voltage of around 2.5-3v from what i understand. i’ve ordered a new position sensor and will report my finding after the re and re and calibration.

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discussion starter · #7 · jan 17, 2018

maybe the two sensors only apply to models with four-c. to my knowledge xc90’s didn’t come with this feature.

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on my 2006, i manually adjusted the beam of my halogen reflectors after installing led bulbs. i turned them down but you can definitely raise them as well. simple mechanical adjuster on the housing.

headlight leveling system malfunction

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728 posts

on my 2006, i manually adjusted the beam of my halogen reflectors after installing led bulbs. i turned them down but you can definitely raise them as well. simple mechanical adjuster on the housing.

headlight leveling system malfunction

i just re-read the op, looks like you have a different setup that has self levelling which i don’t have…

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my my2009 xc90 with bi-xenon headlamps has automatic headlamp level control using the sensor on the rear control arm

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discussion starter · #11 · jan 30, 2018

so i can confirm that there is only one sensor on the left rear control arm and after replacing it and recalibrating using vida it all works now. success!!!!!

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that’s great, glad it worked out!

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so i can confirm that there is only one sensor on the left rear control arm and after replacing it and recalibrating using vida it all works now. success!!!!!

what is the part number for this sensor?

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volvo +61404532026 or 8622446

position sensor

suspension ride height sensor – rear

headlight level sensor

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i got the “service required” warning triangle on my 06 xc90 and yes the bi-xenon headlights are pointed down ….

one option i gather is to unplug the leveling motor and adjust the lights till they point “ok” as the high beam motor is separate and the lights will stay put. so i’ve heard.

i do have a vida reader but haven’t bothered to install s/w yet so i don’t know what the precise problem is. the car was just in for service for something unrelated and i mentioned the lights (do not replace anything) so i’m surprised they didn’t run the diagnostic (i’m kind of annoyed because i did get charged a diagnostic fee…).

not sure i can get under the car to replace anything should a sensor be involved, not a car person, but who knows.

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Category: Headlights