Afternoon all, I hope you are all enjoying this lovely weather while we have it.

I am new to this club so please bear with me.

I am the owner of an Audi A6 Avant S Line (2012).

Little help please. Sporadically, when driving, I will have multiple warning lights come on (TC, tyre pressure, coil light etc) as well as things like headlight adjuster fail, electric handbrake fail, loss of power and speedo/rev counter shut down.

The only consistent condition that seems to trigger all of the above is when it is damp or wet weather. I am also able to trigger the warning lights by leaning over on the drivers side seat. Local garages are baffled and say it is probably a job for Audi. I am keen to avoid that bill so hoping someone here may have experienced the same and diagnosed the problem.

Thanks in advance for any guidance.

Edited May 12, 20242 yr by AndyHY
Missed off model and age of car.

6 hours ago, AndyHY said:

Afternoon all, I hope you are all enjoying this lovely weather while we have it.

I am new to this club so please bear with me.

I am the owner of an Audi A6 Avant S Line (2012).

Little help please. Sporadically, when driving, I will have multiple warning lights come on (TC, tyre pressure, coil light etc) as well as things like headlight adjuster fail, electric handbrake fail, loss of power and speedo/rev counter shut down.

The only consistent condition that seems to trigger all of the above is when it is damp or wet weather. I am also able to trigger the warning lights by leaning over on the drivers side seat. Local garages are baffled and say it is probably a job for Audi. I am keen to avoid that bill so hoping someone here may have experienced the same and diagnosed the problem.

Thanks in advance for any guidance.

Hi could be a battery related thing is it the original?.

Steve.

28 minutes ago, Stevey Y said:

Hi could be a battery related thing is it the original?.

Steve.

Hi Steve, I have no idea if the battery is original. I got the car 1 year ago so was 11 years old when I got it. I assume the battery will have a manufacture date on there somewhere.

 

Andy

7 minutes ago, AndyHY said:

Hi Steve, I have no idea if the battery is original. I got the car 1 year ago so was 11 years old when I got it. I assume the battery will have a manufacture date on there somewhere.

 

Andy

Hi get the battery checked at your local garage/Halfords start with the easy bit then work it forward from there, the next option is a scan and see which fault codes appear, if its not the battery it may well be a bad connection on the module under the seat/carpet.

Steve.

19 minutes ago, Stevey Y said:

Hi get the battery checked at your local garage/Halfords start with the easy bit then work it forward from there, the next option is a scan and see which fault codes appear, if its not the battery it may well be a bad connection on the module under the seat/carpet.

Steve.

OK thanks, I'll get the battery checked and I have an auto electrician coming 3rd June so I'll get the module checked too.

Appreciate your time.

Andy 

20 hours ago, AndyHY said:

OK thanks, I'll get the battery checked and I have an auto electrician coming 3rd June so I'll get the module checked too.

Appreciate your time.

Andy 

Hi Andy thank you for the update it gives the forum value and continuity.

Steve.

Hi all. A lot has gone on with this issue and up to now, no real progress. I had the battery checked and it was in bad shape so I had that replaced. For a brief period, there were no further issues.....and then out of nowhere they were back on.

More research highlighted another place to check. Under the backseat is a J533 module that is responsible for all communication to all ECUs. I have taken the back seat off, disconnected the module, checked the grounding point was secure and plugged it all back in. Lights are clear and no codes, even better news is that I can't seem to trigger the issue by moving around on the seats. Not tempting fate just yet but so far, so good.

On 8/10/2024 at 9:06 AM, AndyHY said:

Hi all. A lot has gone on with this issue and up to now, no real progress. I had the battery checked and it was in bad shape so I had that replaced. For a brief period, there were no further issues.....and then out of nowhere they were back on.

More research highlighted another place to check. Under the backseat is a J533 module that is responsible for all communication to all ECUs. I have taken the back seat off, disconnected the module, checked the grounding point was secure and plugged it all back in. Lights are clear and no codes, even better news is that I can't seem to trigger the issue by moving around on the seats. Not tempting fate just yet but so far, so good.

Hi Andy, I’m having the same issue with my Audi A6 avant (not S Line)! Wanted to see if this has still fixed the issue for you or if it’s reoccurred since? Thank you! 

2 hours ago, Rachel B said:

Hi Andy, I’m having the same issue with my Audi A6 avant (not S Line)! Wanted to see if this has still fixed the issue for you or if it’s reoccurred since? Thank you! 

Hi Rachel, touch wood it has not happened since I did this. Give it a go 😀