Question about the body control module

Hello, I'm new here and wanted to introduce myself right away!

Okay, as my username suggests, my name is Markus, I'm from Bayreuth, and I own a Polo 9N 1.9 TDI from 2002.

Now, to my question:

Since a friend installed a remote control system in my car, the speedometer illumination, hazard lights, ventilation lights, rear window heater, and interior light no longer work. The low beam headlight switch still works.

At VW, the diagnostic scan threw up the following error:

01317 049
Control unit in the dashboard module - J285.
no communication.
sporadically

It should actually be the control unit for the vehicle's electronics.

Has anyone else experienced this error?

Oh yes, after I reconnected everything, it still didn't work.

I would appreciate help .

Thank you in advance!!

You mean the body control module.

I don't think it's broken. Instead, check if your acquaintance might have accidentally introduced an error somewhere in the cable system. Are all the fuses okay?

Regards,
Sure, here is the translation of the text from German to English:

"Micha"

Morning!!!

Okay, I've checked all the fuses, the three ones behind the dashboard panel, and of course, I've also checked all the ones on the driver's side, and they all seem to be fine!

Okay, now that I've disconnected the cables again, it should work, but nothing is happening...

The next thing is that the VW dealership wants 300 euros for this part.
Is there perhaps a website where I can find a used one?

Could it be that it's not this? But then what's the problem?

Markus666 wrote:

Since a friend installed a remote control for me, my speedometer illumination, hazard lights, ventilation lighting, rear window heater, and interior light no longer work. The headlight switch still works.

Is it only the lighting that's not working, or are the actual functions also dead?

Quote:

At VW, the diagnostic system reported the following error: 01317 049 Control unit in the dashboard module - J285. no communication. sporadically

This probably has nothing to do with the other errors. In which storage unit was this error logged?

Unfortunately, I can't tell you where the error was stored, as a friend of mine had a problem with reading the error codes.

Okay, so for example, the hazard lights don't work at all, and the rear window defroster doesn't work either, although the lights do work. The illumination for the ventilation system is also not working, but the air conditioning, heating, and ventilation itself are still functioning.

What's strange is that it turns on, it's also displayed on the speedometer, just like the high beam and the fog light.
Even when starting the vehicle, all the symbols on the dashboard are displayed, but the illumination is not working.
I had already suspected that the potentiometer for the ambient light brightness might be defective, but only the low-beam switch works and its brightness can be adjusted.

Unfortunately, I'm stuck and ordering a new control unit without knowing for sure if it's the problem seems too expensive.

Markus666 wrote:

Unfortunately, I can't proceed any further, and ordering a new control unit at random is a bit too expensive for me.

Well, it seems like your acquaintance probably messed something up during the installation of the FFB.
-> First, I would have him restore everything to its original state and hope that the problem would be resolved.
If not, then a new body control module (BCM) would probably be the next step.

(…and it's all happening again, just because things around cars can never be comfortable enough *shakes head*).

If you're going to do something, do it properly!

It seems the technician who performed the error diagnosis didn't clear the error codes.

Now everything is disconnected again. If you clear the error memory, could it then work?

Markus666 wrote:

Now everything is supposedly disconnected again. If you clear the error memory now, could it then work?

Probably not, because a simple error code entry usually doesn't block the relevant function.
In other words: After the error is fixed, the memory likely only serves as a reminder, like a note saying "something used to be here..."

If the problems persist, there is likely still (at least) a hardware issue. So, either the dismantling wasn't complete or was done incorrectly, or the vehicle's onboard control unit is actually faulty.

Since the vehicle's onboard control unit is also capable of diagnostics, it might be possible to perhaps learn more from its error memory.

Sure, no problem!

I'll probably stop by VW next week and have them read the memory.
I will let you know when I have more details.

But still, thank you!!!