Just bought 2008 1.4 and the CC isnt working.
I think i have read most of the related topics here by now.
I dont have VCDS, but a cheap scanner. It shows: "17977  - Cruise Control Switch (E45): Implausible Signal"
Tested the PCB/Stalk with a Fluke, seems to be ok.
My brakelights works.
Can i test the ECUpart of the brakelightswitch without VCDS somehow?
And same question for the Cluthswitch.

Yes, Brake and clutch pedal switches can be monitored with VCDS in the measuring blocks somewhere, just press the pedals and watch them change state.

Hi, that would be a great suggestion.
But as a said i do not have the VCDS... 😃

4 hours ago, Twoflower said:

Hi, that would be a great suggestion.
But as a said i do not have the VCDS... 😃

 

Sorry, I misread you post.

 

Then no. You will have to take the off and test them manually.

Ok. So now i have tested both the brake and the clutch.

They both work. On the brake one pair is on when pedal is up and the other pair is off.

If PCB, both switches and fuse is ok. What next, wiring loom?

 

It seems unlikely that the wiring will be at fault, and besides, the error code seems to point towards the actual cruise control switch rather than the brake or clutch switch so if i were to put money on it I would put it on a fault with the stalk.

You say you've tested the stalk switch but how was this done? If you just tested resistance, it may not give the full picture.

 

I'm not familiar with the plausibility arrangement but it may involve two switches that can be checked for presence as well as being plausible. In this case, a reference voltage may be fed through each switch and then the output voltages (or currents) compared.

 

Might just be worth checking what other signals are supposed to be on the stalk connector as you may have lost a reference or ground.

 

Having said that, if the reference or ground is lost, I might expect a different fault code not I'm not sure how coarse the fault reporting is on these models.

 

Also, in my automotive experience, it could be the wiring or connections as this is generally the first port of call for problems that I experience but, then, I'm generally looking at new products that shouldn't have failed components.

 

 

 

 

Edited 12 April, 20206 yr by briscaF1

Quote

You say you've tested the stalk switch but how was this done? If you just tested resistance, it may not give the full picture.

I only tested on/off from the switches, on the soldering.

My next move would be to locate the other side of the loom and do the same test.

Is it possible to reach the other side without removing the steering wheel, if anybody know where the loom ends?

 

Likely, if you just unplug (or even wiggle) the PCB connection, you may find that it works, if only for a while...........

 

I re-soldered (just put a dob of solder on each of them) the 3 connectors on the pcb, plugged back in and it has worked forever since.......

 

Some will say clean the contacts but in my experience this is only a temporary fix not much different to just wiggling / unplugging the connector plug.

 

Good luck.

I have no connection on min, soldered directly to the pcb.

But maybe resolder all the connections is step one.

 

Hmm different to mine iirc only three cables on mine.........

 

I was aware of the belief that these were soldered on other vag group cars 

This is mine.

I don't know what I can do now.

Is VCDS (or similar) a must? Or can I maybe find whats cousing the problem in another way?

In my limited experience I would say that looks over-soldered.............is it standard fit on your car, and is it a Fabia or Octavia???

Its a 2008 Fabia.

I asked about fuse originally,  then had a nosy at the wiring diagrams.............seems there is not one for the CCS in vehicles of this age.

Edited 22 April, 20206 yr by UrbanPanzer

Ahh.....had another look, the 5 amp fuse supplies the brake pedal switch for CCS..(not brake lights) as there is 2 sets of contacts in the one switch. The feed goes to the Engine ECU.

So, i guess i have to give up.
VCDS is too expensive, but can maybe any of the other tools get the job done?
Like OBDeleven, not so cheap either but maybe i can use it some more in the future.

Where are you loctaed in the UK, see if a Briskoda member with VCDS is nearby and can help. If your near me, happy to plug in anytime.

Thanks!

But i live in Sweden.

Ah............ok,

 

Always handy to put it in your profile, you have just se, which I assumed was uk - South east.

 

 

^^^^Me too, Lol.

I would stake my reputation on that fault code being the switch.

 

Done quite a few of late.

Ok, wich one, the brakeswitch?

Then i order one and hope for the best.

 

 

I haven't ordered one yet (weekend).
So i wanted to check out the switch a bit more.
It seems to operate as its intended to do.
The two middle pins is in contact when the brake is idle, the outer pair is on when the brake is down and vice versa.
If i delete the fault code it immediately comes back, without driving, braking or anything.
Are you (or anybody else) still sure its the brakeswitch?