Hello All,

 

I'm new to coding and adaptions. I have been trying to find some instructions on how to code lowline module 20 HBA in the hope I can deactivate mine permanently as the control module in the mirror is faulty. Therefore, everytime I use high beam for the first time after restarting car you get an error in the MFD saying it is faulty and and ping as well.

 

There's heaps of posts I've reviewed but almost all refer to module a5 which I don't have.

 

I have ACC, no separate front assist module and the lowline HBA mirror control module.

 

Scan below (VCDS). I am actually using OBD eleven, VCDS was borrowed,  but even if I understood how to do it on VCDS that would be a strong pointer.  This is on a mk7 Golf MQB - similar to Octavia 3.

 

Thanks

 

 

 

 

Log-edit.txt

Edited 10 March, 20224 yr by TheClient

I'm not sure if you can disable hba on a lowline module...

 

The only reason that module would ever be fitted is when hba is enabled. The most obvious/correct path would be to for a non hba rear view mirror and then code it out from the other modules in the car.

 

I'm also pretty sure it's a 0 ohm resistor that fails in these. You could always open it up, checking for the burnt out resistor and if applicable, replacing it with a wire...?

1 hour ago, langers2k said:

I'm not sure if you can disable hba on a lowline module...

 

The only reason that module would ever be fitted is when hba is enabled. The most obvious/correct path would be to for a non hba rear view mirror and then code it out from the other modules in the car.

 

I'm also pretty sure it's a 0 ohm resistor that fails in these. You could always open it up, checking for the burnt out resistor and if applicable, replacing it with a wire...?

Hi @langers2k

 

Oh that will explain maybe why I haven't been successful. I tried to change the first bit in module 20 where it specifies headlight type to 00 so nothing selected. But it wouldn't accept it.

 

Bear with me for a second though. Say you had a car without hba, just auto dimming, then you get a used part for my lowline type hba mirror. Wouldn't you need some coding. Or are you saying it would work on plugging in? 

 

Annoying if I can't deactivate hba.   I just thought it is my coding incompetence and I've missed some coding or adaption deselected in 19 gateway or 09 central electronics.   

 

Yes. I saw the resistor write up. I could probably fix that. But after removing the mirror and try with several pry tools, credit card etc I gave up. Its well closed up - the mirror assembly. Wondered if it has to be cut apart.

 

Thanks for your reply...

 

I have the same problem. I have take mine apart and the resistor is fine (I tried bridging it anyway). £700 for a replacement - I don't think so - and it was crap anyway.

 

But, you can disable the functionality in the the Infotainment system under Lights. I've done that and it no longer pings or gives any error. It still shows an error on a VCDS/OBDeleven scan, but no error on the dash.

 

HTH, Nick

@NikTheGeek thanks for your reply.

 

i agree, im not too fussed about having HBA. The dash ping and dash fault everytime I first use high beam annoys me though.

 

I'm not sure if it's due to my equipment spec or if it's because of the faulty module but there is no HBA or FLS option in my entertainment menus under lighting. 

 

I'm blocked at every turn to trying to get around this!!

 

BTW how did you get the mirror apart? 

 

Thanks A 

Edited 10 March, 20224 yr by TheClient

This is my option. Light Assist, now unticked. Excuse the dusty head unit. So you don't have this but yet do have HBA? What if you wanted to turn it off? I don't understand why you wouldn't have the option.

 

As for removing the mirror, it's easy when you watch this

 

 

HTH, Nick

 

2 hours ago, NikTheGeek said:

This is my option. Light Assist, now unticked. Excuse the dusty head unit. So you don't have this but yet do have HBA? What if you wanted to turn it off? I don't understand why you wouldn't have the option.

HBA and Light Assist are 2 different options.

 

My previous 2015 Octavia had HBA not Light Assist so there was no Light Assist menu in the infotainment and no HBA menu in the infotainment either.

Yes. Thanks. That must be why I have no option related to HBA in the lighting menu. It can only be deactivated in use, by turning the headlights on the rotary switch to on, not auto.

 

In auto HBA functions all the time. Not for me though as its faulty! And I usually keep the headlights on auto so always get confronted with the fault! 

2 hours ago, NikTheGeek said:

This is my option. Light Assist, now unticked. Excuse the dusty head unit. So you don't have this but yet do have HBA? What if you wanted to turn it off? I don't understand why you wouldn't have the option.

 

As for removing the mirror, it's easy when you watch this

 

 

HTH, Nick

 

Thanks. I don't think I explained myself properly. I can get the mirror off. It's separating the mirror casing to get to the pcb I couldn't do! 

2 hours ago, TheClient said:

Thanks. I don't think I explained myself properly. I can get the mirror off. It's separating the mirror casing to get to the pcb I couldn't do! 

 

Ah, sorry. Just like taking a phone or laptop apart: use a plastic pry tool around the edge and it releases the clips. It's quite stiff, but comes apart ok...

 

Nick

10 hours ago, TheClient said:

Bear with me for a second though. Say you had a car without hba, just auto dimming, then you get a used part for my lowline type hba mirror. Wouldn't you need some coding. Or are you saying it would work on plugging in? 

 

Yes, if you were to retrofit a lowline HBA module, you would code other modules.

 

You can try 'uncoding' HBA, at a guess:

- BCM adaption Fernlicht_assistent-Menuesteuerung Fernlichtassistent to not present

- BCM adaption Fernlicht_assistent-Menuesteuerung Fernlichtassistent Werkseinstellung to not present

- BCM long code, Byte 2, Bit 0-2, check the drop down for the correct option

 

That will probably just remove the HBA option from the headunit. The only extra thing would be to remove 20 from the CAN gateway installation list, that'll definitely result in some error codes, not sure if either of these will prevent the warning on the cluster etc.

 

Assuming the rear view mirror has a switched power feed, disconnecting the two CAN-bus wires should finish the removal. If it has a permanent feed, I'd be worried about battery drain...

1 minute ago, langers2k said:

Assuming the rear view mirror has a switched power feed, disconnecting the two CAN-bus wires should finish the removal. If it has a permanent feed, I'd be worried about battery drain...

Depends if you have auto-dipping in the mirror. Disconnecting the feed might disable that?

1 minute ago, NikTheGeek said:

Depends if you have auto-dipping in the mirror. Disconnecting the feed might disable that?

 

If it's only got a permanent feed, then yes, removing the CAN-bus wires may kill that.

 

If it's a switched feed, it'll probably still work.

 

I can't be sure so it's down to the OP and how far they want to go

10 hours ago, langers2k said:

 

If it's only got a permanent feed, then yes, removing the CAN-bus wires may kill that.

 

If it's a switched feed, it'll probably still work.

 

I can't be sure so it's down to the OP and how far they want to go

Thanks both. Maybe not that far!! I'll try the bcm adaptions and coding first and see if any change. Thanks for all the pointers. I'll respond back as to any success or not with coding and adaption changes. 

Some success - I think.

 

I'll post a more detailed reply later but on 09 - changed the adaption for light assist - High Beam Assist (text was in German Menuesteurung Fernlichtassistent ) to Not Present.  In Long coding byte 2, changed  option to Bi-xenon without light assist.

[Initially I deselected all headlight options under byte 2,  but then the dynamic cornering light option disappeared from the menu in the ent system.]

 

Seems to have worked. No mfd dash warning or ping when using high beam.

 

It also seems to have removed the 09 fault error for a data error received.

 

The HBA error for faulty control module still shows in scan but that doesn't worry me.

 

@langers2k given the above - I shouldn't be left with a battery drain issued should I?

 

Thanks All.

1 hour ago, TheClient said:

@langers2k given the above - I shouldn't be left with a battery drain issued should I?

 

I'd expect it'll to be fine

On 11/03/2022 at 14:05, TheClient said:

Some success - I think.

 

I'll post a more detailed reply later but on 09 - changed the adaption for light assist - High Beam Assist (text was in German Menuesteurung Fernlichtassistent ) to Not Present.  In Long coding byte 2, changed  option to Bi-xenon without light assist.

[Initially I deselected all headlight options under byte 2,  but then the dynamic cornering light option disappeared from the menu in the ent system.]

 

Seems to have worked. No mfd dash warning or ping when using high beam.

 

It also seems to have removed the 09 fault error for a data error received.

 

The HBA error for faulty control module still shows in scan but that doesn't worry me.

 

@langers2k given the above - I shouldn't be left with a battery drain issued should I?

 

Thanks All.

 

A few images to go with the explanation. Note:  this is on a Mk7 Golf, MQB with bixenon headlights, HBA lowline and dynamic cornering lights (halogen).