hi all, 

         i have a mk1 2007 roomster 1.9 tdi with a couple of problems which are,

1, all 3 brake lights are not working i have checked bulbs and fuse and are all ok.

2, no indicators blinking on dash but are working outside.

 

any help or ideas would be great thanks for looking  

Probably need a new brake light switch, item 1 here: socket; for models with towing facility; ========... - Roomster(RO) [EUROPA 2007 year] (7zap.com)

6Q0945511 genuine recommended, and not expensive from dealers.

 

Not sure about 2, do you get the clicking noise from the cluster, but just no telltale LEDs? or neither?

 

Edited 14 September, 20214 yr by Wino
sp

Indicators work all round outside of the car just no blinking or clicking inside the car it's very strange 

It is very strange, and also an MOT fail, I fear.

My suspicion would be a fault within the onboard supply control unit above the accelerator pedal. I've not looked at how that monitors what the indicators are up to, but it must be a status output or two from the chip that drives the indicator bulbs, I guess. I'll have a look at one tomorrow if I get a chance.

You haven't swapped the indicator bulbs out for LED equivalents, by any chance?

Ok thanks I've sorted the the brake lights it was the brake light switch sticking so replaced that lights working good now just the indicators to sort 

Just now, chalky31 said:

Ok thanks I've sorted the the brake lights it was the brake light switch sticking so replaced that lights working good now just the indicators to sort 

 

No just standed bulbs 

10 minutes ago, chalky31 said:

No just standed bulbs 

Hmm, thought that might be an easy explaantion of the fault, as the chip monitors its output current on each channel (left and right side of car). LEDs would be much lower current and probably fail to register as being on.

 

I suspect the chip itself (BTS5240L on ones I've looked at from around 2005), or the circuit beyond it towards the 'brains', but swapping in a whole other onboard supply unit might be the pragmatic fix.  Some swapping across of coding with VCDS might need doing though.

Ok will changing out the whole dash help. Will have to do more digging 

My gut feeling is that it's not an instrument cluster fault, and I think that's a trickier swap anyway.

Great can't wait for that lol. Thanks for the advice

If you put the hazard lights on, do you get any flashing/clicking from the clocks?

Not that I heard but will check again tomorrow 

Re 2 - I'd start with hazard switch /relay (Is it in one unit as per some other Skoda's?) . This failed in a strange way a few years ago on my mkI Octavia. 

 

Also could this be an earthing issue?

 

 

Hazard switch is just a pull-to-ground momentary signal input to the onboard supply control unit, I believe.

6 minutes ago, Wino said:

Hazard switch is just a pull-to-ground momentary signal input to the onboard supply control unit, I believe.

 

Agreed after checking a circuit diagram

 

Cheers gents whatever it is is seems a git to sort 

Everything else on the dash working ok?

Anything changed or other work been done?

Swapping in A.N. Other onboard supply control unit would be pretty easy, and not expensive if you were happy to go secondhand. 

Would just need 2 minutes with VCDS on the old one to see the coding (unless you've already got a scan, which would tell you the info?), and 2 more to make the new one have the same coding, after installing it.

Could just do it temporarily without any coding to see if it fixes the fault.

Everything else works on the dash I think will have a look tomorrow. I haven't got a vcds only a basic code reader not sure if that will do whats needed and where is the the A.N and what is it please 

I just meant 'another'.

Ok lol thanks for you help.

17 hours ago, chalky31 said:

Indicators work all round outside of the car just no blinking or clicking inside the car it's very strange 

In my previous Octavia i had a similar issue and it was from the hazard / alarm switch. We replaced it and everything was fine since then until O sold the car.  

Update indicators back blinking and clicking on the dash today but now have turning light flashing but I don't have turning lights plugged in no codes on my  basic code reader 

13 minutes ago, chalky31 said:

turning light flashing

Not sure what you mean by that. Photo? 

Pic of flashing light