Hi guys, 

 need some help or pointers on where to find the BCM or CCM on my 2012 Octavia scout.

 Randomly the front driver indicator has come on and stayed on even with key out etc etc.  
 I have got fault codes but depending on how I test or what I’ve unplugged and plugged back in the codes change slightly. 
 Indicator doesn’t flash just stays on, the mirror and rear flash as normal but the front just says on constant even when I’m not indicating... headlight plus is fine no corrosion etc, tried resetting car with battery disconnect etc and tried clearing fault codes but as soon as I plug the headlight in it’s instantly on. Even swapped headlight over from my 2010 model incase it’s internal headlight wiring at fault but still the same. 

The BCM is located in the drivers footwell above the pedals, pretty obvious as it has three large connectors (white, black and gold/brown).

 

I think your BCM might be fried... Have you got aftermarket xenons/HID's fitted as they are the normal cause of this. 😕

 

 

 

Given that the other headlight does exactly the same then either a fried BCM or possibly chafed wiring where the indicator feed is in contact with a permanent 12v feed, possibly the high beam wiring as well, the fault codes would indicate that voltage is present on those circuits when it shouldn't be.

 

The indicator being lit is proof of that, perhaps its a high resistance feed to the main beams not enough to illuminate them.

Hi guys thanks for the reply’s, yes I’ve got NOVSIGHT LED foglight bulbs fitted and also NOVSIGHT high beam bulbs fitted with dipped beam being HID and also activated cornering lights with fog lights and selected fog lights instead of dipped beam for arriving/leaving mode, but I did this a few weeks ago. My 2010 model scout is the exact same set up and that’s been fine for 2 years. The only difference is this time I got 55w hid canbus kit where as on my other I used 35w canbus hid kit. 
 

Have a search of the forum those retrofit HID/LED kits are notorious for destroying BCMs, especially if they are coded for halogen headlights. Some people have had success fitting the NON canbus friendly ones and coding the car for xenon headlights but it's hit and miss really. Do all your wipers work?

Edited 29 May, 20206 yr by slow_nick

Some people with exactly the same problem who have also fried their BCM: 

 

 

 

 

 

 

 

Edited 29 May, 20206 yr by slow_nick

3 hours ago, slow_nick said:

Have a search of the forum those retrofit HID/LED kits are notorious for destroying BCMs, especially if they are coded for halogen headlights. Some people have had success fitting the NON canbus friendly ones and coding the car for xenon headlights but it's hit and miss really. Do all your wipers work?

Yes everything else works as it should, wipers are fine... 

Could I get a second hand BCM and just copy my original code (long code) to the donor BCM or would I need to go threw the settings and do an exact like for like setup? As in changing the settings one at a time to the same as the original BCM or is it not that simple? I do no where there is another 2013 scout same as mine that’s been written off so I could potentially fit that ?? 

50 minutes ago, Mick562008 said:

Yes everything else works as it should, wipers are fine... 

 

OK, the wiper motor failure is just one slightly less common symptom of a fried BCM. The indicator sticking on is still a pretty good sign that the BCM is toast though. It can be repaired by someone with good technical skills, otherwise yes you can replace it with the same part number or a possibly a higher spec BCM and code it. @langers2k knows more.

Edited 30 May, 20206 yr by slow_nick

Earlier cars with a CECM and CCM tend to blow up wiper motors. Later cars with a BCM tend to blow up lighting channels and get the permanently lit indicator.

 

Both are caused by HID/xenon kits

 

The BCM's normally can be fixed if you find a decent electronic repair shop who are happy replacing the damaged chips. If I remember correctly, the part number is VNQ5E050MK or similar. You should check the old chip first.

 

8 hours ago, Mick562008 said:

Could I get a second hand BCM and just copy my original code (long code) to the donor BCM

 

Assuming it's a compatible part number you should be able to just copy the lcode over. You would also need to relearn the remote fobs for the central locking.

 

There is one major caveat - the lighting configuration. As byte 18 is typically 00, you should ideally try and find a BCM from a similar Octavia to avoid messing around. It probably isn't too bad on a Scout as there are no DRL fitted. It can be fixed but you'd need VCP or ODIS to do it as VCDS cannot fix this.

 

The BCM from the 2013 Scout is probably the easiest fix, just remember to remove the HID/xenon kit...

5 hours ago, langers2k said:

Earlier cars with a CECM and CCM tend to blow up wiper motors. Later cars with a BCM tend to blow up lighting channels and get the permanently lit indicator.

 

Both are caused by HID/xenon kits

 

The BCM's normally can be fixed if you find a decent electronic repair shop who are happy replacing the damaged chips. If I remember correctly, the part number is VNQ5E050MK or similar. You should check the old chip first.

 

 

Assuming it's a compatible part number you should be able to just copy the lcode over. You would also need to relearn the remote fobs for the central locking.

 

There is one major caveat - the lighting configuration. As byte 18 is typically 00, you should ideally try and find a BCM from a similar Octavia to avoid messing around. It probably isn't too bad on a Scout as there are no DRL fitted. It can be fixed but you'd need VCP or ODIS to do it as VCDS cannot fix this.

 

The BCM from the 2013 Scout is probably the easiest fix, just remember to remove the HID/xenon kit...

Thanks for all the info, this is the first time this has happened upto now as I’ve done around 6 scouts like this... only difference is this is the first time I’ve used 55w hid instead of 35w hids. 
 Has it ever caused any problems using LED H7 dipped beam bulbs instead of the HID kits?