Heated Seats and Interior Lights Stopped Working

[8BallAddict]

Hi All.

Got some weird stuff going on with my 8v saloon. Noticed yesterday that both heated seats have stopped working. Been in to the fuses today and checked what I think is the 30a fuse for the seat heating (F26) and it is all good. But I’ve also just noticed that the interior lights aren’t working now either. I believe they are on a different 7.5a fuse (F29) but that is also ok. I’ve done a VCDS scan and no obvious fault codes showing up.

Anyone have any ideas what is going on here?

 

[NHN]

Grab meter & start testing fuses, had one of my bcm fuses go & that took out a few things, even if car was fine so to speak.

Took me a while to find one that randomly went that I wouldn't think was related given it's not shown as part of those systems in the schematics, alas.

 

[8BallAddict]

Grab meter & start testing fuses, had one of my bcm fuses go & that took out a few things, even if car was fine so to speak.

Took me a while to find one that randomly went that I wouldn't think was related given it's not shown as part of those systems in the schematics, alas.

Just done this. Removed the glovebox (mainly because I dropped one behind it ) and tested every fuse. All seem to be fine!

Think the ones in the engine bay could have something to do with it?

 

[8BallAddict]

Tested all the fuses including the engine bay ones, they all seem fine.

The only fault code I’m getting on VCDS is the following...

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Address 09: Cent. Elect. Labels: 5Q0-937-08X-V2.clb
Control Module Part Number: 5Q0 937 084 CF HW: 5Q0 937 084 CF
Component and/or Version: BCM MQBAB M+ H34 0236
Software Coding: 000000000000000000000000000000000000000000000000000000000000
Work Shop Code: WSC 06385 790 00016
ASAM Dataset: EV_BCMMQB 017001 (AU37)
ROD: EV_BCMBOSCH_017.rod
VCID: 7EF3F07FE12A9666B9-802A
1 Fault Found:

15360512 - Component Protection
U1101 00 [00001001] - Active
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 4
Fault Frequency: 1
Reset counter: 254
Mileage: 163877 km
Date: 2024.11.14
Time: 14:09:30

Terminal 15 status: On
Terminal 50 status: OFF
CAN-Bus_aktiv: On
Status Bremslichtschalter (HW): OFF
Status Bremslichtschalter (CAN): OFF
OFF: Not operated
Position lamps: Not operated
Automatic high beam assist: operated
Low beam: Not operated
Parking light left: Not operated
Parking light right: Not operated
last_wakeup: no cause for fault protection
Voltage: 14.6 V
Outside temperature: 13.0 °C

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Address 19: CAN Gateway Labels: 3Q0-907-530-V1.clb
Control Module Part Number: 3Q0 907 530 C HW: 3Q0 907 530 C
Component and/or Version: GW MQB High 515 5286
Software Coding: 030100041F0873005B0002481C0B00000001010000000000000000000000
Work Shop Code: WSC 06385 790 00016
ASAM Dataset: EV_GatewNF 013020 (AU37)
ROD: EV_GatewNF_VW37.rod
VCID: 2F6D1D3B76C0AFEE62-807A
1 Fault Found:

15360512 - Component Protection
U1101 00 [00001001] - Active
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 4
Fault Frequency: 1
Reset counter: 254
Mileage: 163877 km
Date: 2024.11.14
Time: 14:09:31

Terminal 30 power supply: 14.6 V
Terminal 15: On

 

[8BallAddict]

Could it be a faulty BCM module?

 

[q2us3r]

Component Protection is active in your BCM as per your log; heated seats, internal lights, screen brightness, ambient lights, and other things will be disabled.... but how did component protection trigger in your BCM? did you change the BCM?

 

[8BallAddict]

Component Protection is active in your BCM as per your log; heated seats, internal lights, screen brightness, ambient lights, and other things will be disabled.... but how did component protection trigger in your BCM? did you change the BCM?

Thanks for the message. I didn’t realise what CP was. But no, I haven’t changed anything in the car. I’ve had an issue with the MMI randomly turning off and back but that’s been going on for the last year and I’ve noticed that the MMI screen brightness has been flickering for some time now. Not managed to figure out what was causing it. The MMI is still working now though. But yeah you’re right, the ambient lighting also isn’t working along with other things.

Any idea how I resolve this?

 

[q2us3r]

It requires dealer level tools to remove it so only a VAG registered garage or dealer can do it, it's a 10 minute process. Though odd that it triggered in the first place, it means that the gateway no longer recognises your BCMs serial number (the gateway keeps a list of all the component protected modules that are fitted to the car and so it's treating your BCM as if it's a new module that it does not have on its list and hence triggering component protection on it).

 

[8BallAddict]

Do you think it could be caused by it developing a fault itself? Not sure there’s any other explanation for it if not. I’ll speak to a VAG garage tomorrow and see what they suggest.