Suddenly got headlight range control + suspension system fault lights

[zizouomar]

Hi everyone,

I was driving and all of sudden, those 2 lights appeard with their annoying loud BEEPs.
Stopped and scanned the car with my obdeleven, results :

Right rear level control system sensor
00775

Comfort limitation
03262

Left rear level control system sensor
0074

Function restriction
03263

Electronic Damping Control Module
00471


Cleared the codes and they come back every time I start the car and drive for a few miles.

The car has been on H&R SuperSports for more than 7 years and never had an issue. ADS works normally afaik and the headlights still make their up/down dance when I start the car.

Any ideas ?

Thanks

[Smac770]

So you have the 1BL adaptive suspension, which means you have level sensors on all four suspension corners. And you have some kind of issue with the right rear and left rear, but typical OBDeleven, it's missing the "what's actually wrong" subtext. You might recheck the DTCs, there should be more text.

If you go into the measuring blocks of the J250, somewhere should be a block showing the height value being interpreted from the level sensor signals. Do the two rear values seem intelligible, if they are present at all, and do they change as you bounce the rear of the car? Beyond that, you'd need to check the sensors and wiring directly.

The J250 is in the right rear with the J393 and the J540 EPB and such, the large one closest to the trunk wall.

[zizouomar]

So the only thing that OBDeleven says is mechanical malfunction.

I tried looking on the internet for the channel in OBDeleven live stats linked to the J250 but can't find which one is it in the 1-254 range.
Do you have any idea about how I can find such info with this device ?

[Smac770]

I have a B8.0 and do not have a J250, so I can't offer any personal exploration for the necessary blocks.

https://forums.ross-tech.com/index.php?threads/20996/

It seems blocks 002 and 009 are of interest. I do know the voltage supplied to the level sensors is 5V, and the output is just a voltage divider output based on the level of the arm. Blocks 003 and 032 also seem to be of interest in the thread.

Best route would be to bring up a block and bounce on the door sill and see if values move. If they do, then you know you're looking at something reflective of the live state of the sensors. Then you can work from there to determine which corner each value represents.

[zizouomar]

I have a B8.0 and do not have a J250, so I can't offer any personal exploration for the necessary blocks.

https://forums.ross-tech.com/index.php?threads/20996/

It seems blocks 002 and 009 are of interest. I do know the voltage supplied to the level sensors is 5V, and the output is just a voltage divider output based on the level of the arm. Blocks 003 and 032 also seem to be of interest in the thread.

Best route would be to bring up a block and bounce on the door sill and see if values move. If they do, then you know you're looking at something reflective of the live state of the sensors. Then you can work from there to determine which corner each value represents.

That was extremely useful thanks a lot. My issue seem to give the exact same behavior, just not the same corners.

So the blocks 002 and 009 seem to all be static either without or with the fault codes triggered.



However, the interesting ones are 003 and 032.

Here are their values when starting the car :



And here they are right after the codes pop up on the dash :



Values of corner 1 and 2 are constantly changing when the car is moving, which means front ones are working normally.
So that leads me to think, the corner 4 that shows a fixed value of 50 in block 003 and ERROR in block 032 is the one broken or misconnected and that leads the corner 3 to not behave as it should and show a fixed value of 21%. Like the issue the guy is having in the link you provided.
Meaning both facing sides of either front or rear, rear in my case, should be working or else both will trigger an ERROR fault in block 032 and a fixed 50% value read in block 003.

Now to verify the state of this corner 4 level sensor, do I have to put the car on a lift and take the wheels out ? I know approximately the location of the front level sensors, but no idea about the rear ones.

[Smac770]

Yeah, you'll need it off the ground I would expect. https://www.audizine.com/forum/showt...1#post11470253
So the arm is attached to the center of the large lower control arm, and the sensor is mounted above it behind the spring.

[zizouomar]

Yeah, you'll need it off the ground I would expect. https://www.audizine.com/forum/showt...1#post11470253
So the arm is attached to the center of the large lower control arm, and the sensor is mounted above it behind the spring.

Wanted to thank you Smac770 for another issue resolved.
Replaced both rear level sensor's rod links and the annoying beep and errors are gone.

Now for the headlights recalibration, how should I tackle it. I feel that it needs a reset as they seem to shoot light too high.

[Smac770]

You'll want to see where the headlight range basic setting is located. For B8.0, that'll probably be 55-headlight range; for B8.5, that'll probably be 09-central electrics. Then run that basic setting operation. It'll start by zeroing the car, then you manually aim the headlamps against the wall per spec (1% down slope), then you say complete the task. Note, prerequisites include a full fuel tank (or ballast in the trunk representative of the missing weight) as well as a driver's weight in the driver's seat (I just put some books on the seat to raise the level out of the "bucket", then put five of my 45lbs plates on those; yeah, I'm not a light boy).

[Fresh.S4]

i hate, hate! the range headlight control code. i always had this problem with all 3 of my s4s. i used to be able to fix it with generic replacement parts off ebay but with my most recent '11 s4 i got the error to go away but my headlights do not do the up/down during startup nor bounce while driving. in vcds i can activate the tests to go up/down but it never does it naturally.