The cruise on my 2007 Mk1 SE didn't work from when I bought the car and I was told that it was probably just a faulty switch.

 

The brake and clutch switches are fine, all working so no problem there.

 

The car has had an EGR delete and the map reinstalled minus the EGR coding, but cruise wasn't working prior to that being done.

 

I've checked on VCDS and the switch is indicating as toggling between "0" and "1"  (ie on and off) so the main on/off switch is confirmed at the ECU as working.

 

The ECU was looked at and confirmation given that cruise is enabled.

 

Just in case it was something simple, the map was re-loaded, and using the login for VCDS, cruise re-enabled, and all flagged up as ok....except it isn't.  It doesn't work on the car.  You can switch between off/on/resume and nothing happens.

 

I've run out of ideas now so over to someone else who can possibly shed light...is this a common occurrence?  Just in case its a faulty switch connection (ie resume or speed up/down) on the switch, I've ordered a new one as that's the only thing that hasn't yet been tried.  Any suggestions appreciated.

There is more than just one switch that can have an effect on the CC stalk. Have you tried constant accel or decel from the slider/button?

 

Also, have heard of electrical contact cleaner being used on the stalk.

 

Mine works mostly. It was perfect, but now I think the slider control gets a bit intermittent and it sometimes loses the set speed. Immediately accepts a new set speed though so it's a minor irritation...

Doesnt it need a speed sensor as well to identify when it can work ie above 30mph, checked that its ok?

Speed sensor seems ok, and slider switch is working between on/off positions as you can see the VCDS confirming this, so diagnosing where the issue is has me baffled.  I'll try the new switch as it's the only thing not yet done.  It's like the ECU is saying one thing but when driving the car the cruise doesn't come on at all.

 Can you advise how you are checking it through VCDS - i.e. which parameters are you checking. Mine has trouble occasionally when it will not latch on so would like to know how to check things such as the clutch switch.

The tech who was looking at this today had his laptop booted up and plugged into the OBD port with the VCDS screen up.  The main menu included a log-on and when in, he navigated to cruise and about 6 parameters came up including the main switch one. The others included brake switch and clutch switch function, speed sensor, speed set and a few others.  Going to the main switch setting, there were two "0"s in the field box and when the cruise was switched on, on of them changed to a "1" indicating that the switch was functioning on/off ok.  Trying clutch and brake switches also resulted in those flags being confirmed as functional. I've probably over simplified it as he had to type in some codes, but that's about the jist of things.

Did it get fixed?

Hi Tech1e

 

no, not yet. I have a new switch on its way and am hoping that does the trick.  I'll post back when I get a chance to get it sorted which wont be for at least a week.