Normski

Blinking Afs Light On Dashboard

Recommended Posts

Touch wood my Lexus RX has been faultless...until now. Was driving along today when all of a sudden the "AFS OFF" light started to flash. I stopped and restarted the car and all went back to normal but i'm now worried. Having done a couple of searches here it could be a leveling sensor problem. Anyone had this replaced - if so how much are we looking? I'm presuming it's not a DIY job??

I reckon all this could be related to some condensation i've been seeing in my passenger headlamp. Hasn't really bothered me until now but i've got a feeling it could be related :(

Anyway, any info guys would be much appreciated.

Ta.

Share this post


Link to post
Share on other sites
 

I think you'll find it is the adaptive front lighting system afs. Best get it plugged in to a diagnostic tool to read the data. It may be linked to your condensation problem in a headlight.

  • Like 1

Share this post


Link to post
Share on other sites

Hi all,

I started getting this flashing AFS light on my 2006 rx400h today.  I found that the position of the AFS  switch made no difference after the flashing began, but if I parked and turned everything off, the problem must sometimes have reset, because it did not always come on again  straight away.  I've made several journeys in the dark this evening and found that when the light was not flashing, the headlights did turn sideways as normal when cornering. When the  light was flashing, the beams did not turn sideways.  

The dipped beam height did not seem to be affected all, though I have always felt that it was too low.  

I see that some have said that the warning light means that the height sensor is faulty - or the linkage is broken.  However, the handbook shows that there is a separate warning system to warn when the self levelling system is faulty, and this system has not been triggered.  

I have not yet checked the height sensor as it's been dark outside, but I will have a look tomorrow,  weather permitting.  

Is the diagnosis of the height sensor definitive, or could it be anything else?

  • Like 1

Share this post


Link to post
Share on other sites

Do the lights perform their dance when you first start the vehicle? You will get AFS warning if that self test doesn't complete properly so maybe one of the motors and/or position sensors isn't working correctly. 

Share this post


Link to post
Share on other sites
17 minutes ago, ColinBarber said:

Do the lights perform their dance when you first start the vehicle? You will get AFS warning if that self test doesn't complete properly so maybe one of the motors and/or position sensors isn't working correctly. 

i.e., lights on first, then ignition on ...

Share this post


Link to post
Share on other sites

3 hours ago, ColinBarber said:

Do the lights perform their dance when you first start the vehicle? You will get AFS warning if that self test doesn't complete properly so maybe one of the motors and/or position sensors isn't working correctly. 

Hi Colin, I think the warning light began flashing even before I turned the headlights on.  My wife first noticed the flashing light in the daytime, when the headlights were not used.  

Does this rule out the test you described as a possible source of fault?

Share this post


Link to post
Share on other sites

I got my head underneath the rear today to examine the headlight level sensor.  It was in one piece, all joined together, and nothing appeared wrong.  I unplugged the electrical connector anc found tthe connectors all shiney and bright.  So, nothing appears untoward with the sensor or its linkage.  

Share this post


Link to post
Share on other sites
1 hour ago, welland said:

I unplugged the electrical connector anc found tthe connectors all shiney and bright.  So, nothing appears untoward with the sensor

Did you only look at the plug/socket? It could be the inner workings of the sensor (springs and contacts) so you really need to take the cover off and check continuity and/or resistance with a multimeter before you can rule the sensor out.

  • Like 1

Share this post


Link to post
Share on other sites

32 minutes ago, Herbie said:

Did you only look at the plug/socket? It could be the inner workings of the sensor (springs and contacts) so you really need to take the cover off and check continuity and/or resistance with a multimeter before you can rule the sensor out.

Hi Herbie, 

yes I did just give the plug and socket a visual inspection.  

If there is a fault inside the sensor, wouldn't it be strange that the AFS warning would be triggered instead of the headlamp leveller warning?  

Share this post


Link to post
Share on other sites
14 hours ago, PCM said:

i.e., lights on first, then ignition on ...

Sorry, didn't spot your comment yesterday.  Is this a question?  I did the following test this morning

1) turn key to position 2. 

2) after a pause of maybe 10 seconds, the afs light began flashing. 

3) turn key to position 3 to put car into "ready" state. 

4)  wife turned headlights on while I observed them outside.  I don't think they did their usual dance.  

I suppose a key question is this: 

Is the lack of the dance a symptom or cause of the flashing afs light?

  • Like 1

Share this post


Link to post
Share on other sites

Just found this good video on YouTube: 

 

However, my linkage is all attached and both my ball joints are swiveling freely.  Anyway, I'm a bit confused about one thing in the adjuster.  It has three nuts on the threaded bar. Clearly, the centre one must be fixed in order to turn the threaded bar.  I would have expected the nuts at the ends to move freely and that they would be tightened against the ball joint as a locknut.  The video did not mention this locking function of these nuts.  Are they supposed to move freely?

Share this post


Link to post
Share on other sites

"my linkage is all attached and both my ball joints are swiveling freely."

!

  • Haha 1

Share this post


Link to post
Share on other sites

1 hour ago, PCM said:

"my linkage is all attached and both my ball joints are swiveling freely."

!

Just like Elvis Presley! 🎵

  • Like 1
  • Haha 1

Share this post


Link to post
Share on other sites

The dance happens when the ignition is turned on. I don't think the headlights need to be turned on. Turn on the lights and then turn on the ignition to see it happening (or leave on auto and test at night).

The system will check the height sensors (both front and rear) and move the lights. If something doesn't work correctly you will get a warning light. There will also be a fault code stored in the ECU - that will help determine what the issue is.

1597473901_ScreenShot2019-02-11at22_07_13.thumb.png.4de4d2e9e8cc799a470abb2d943ffb9a.png

  • Like 2

Share this post


Link to post
Share on other sites
1 hour ago, ColinBarber said:

The dance happens when the ignition is turned on. I don't think the headlights need to be turned on. Turn on the lights and then turn on the ignition to see it happening (or leave on auto and test at night).

The system will check the height sensors (both front and rear) and move the lights. If something doesn't work correctly you will get a warning light. There will also be a fault code stored in the ECU - that will help determine what the issue is.

1597473901_ScreenShot2019-02-11at22_07_13.thumb.png.4de4d2e9e8cc799a470abb2d943ffb9a.png

Hi Colin, thanks for this. 

I have just popped out into the car to retest it.  Brrrrr.  2C on the thermometer, but frost already forming on the windscreen.  

1)Before I put the key In the ignition lock, I turned on the lights.  They came on without the dance.

2) I then switched it one click further to auto, the lights went off.

3) I turned the key to position 2 and the lights came on again, without the dance.  Bizarrely,  the flashing AFS warning did not occur, even after waiting around 2 mins.  

4) I switched the lights off and on a few times, but never saw the dance or the flashing AFS light.  

Is it true that the dance only occurs once in each drive cycle? 

I will try to plug in my laptop tomorrow evening to check for DTCs.  

  • Like 1

Share this post


Link to post
Share on other sites
21 hours ago, welland said:

Is it true that the dance only occurs once in each drive cycle?

Yes I believe so, either with ignition or when 'Ready' - cannot remember which.

  • Like 1

Share this post


Link to post
Share on other sites

Just popped out with my laptop to check for DTCs.

OBDAutodoctor reported no faults at all.

EasyOBD11 reported a pending fault C0700:  fault definition not available or manufacturer specific.  

Baffled about why OBD autodoctor didn't report this fault too - maybe a false positive in EasyOBD11? 

Anyway, checked google and somebody else reported this code means LF Solenoid Circuit Malfunction.  Anybody know what this means? Could it be related to my AFS issue?

Meanwhile, the AFS light is not flashing now, but also the headlights do not dance when turned on.  

Hmmmm (scratches head).    

Share this post


Link to post
Share on other sites

99% of the time when people get the AFS off flashing light it is the mechanical bit of the rear suspension level sensor that has snapped so I think that you are in the 1% Welland!

The fact that the fault is temperamental suggests an electrical issue rather than a mechanical one so it could be a component of the AFS that is a bit dodgy rather than headlamp levelling.  That LF Solenoid problem would be Left Front but from Googling that error code and description most seem to suggest it's an ABS issue.  I see no reason for AFS and ABS to be linked because they don't share any common parts that I know of.

That code could be a red herring that is either completely false or you could have an ABS issue in the pipeline.  I think that what you're best to do is plug in your OBD readers when the fault is live and see if any new codes come up.  These free systems can't connect to every circuit in the car unfortunately otherwise garages wouldn't spend 10's of thousands on diagnostic equipment if they could just use a laptop and free software would they?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now