Weird VCDS issue

[dantheram]

When I plug in with my VCDS Lite I get the "no response from controller message" on everything I test. But at the same I can hear both headlights adjusting until the error message pops up. What on earth is going on?

[dantheram]

Tested the laptop, cable and VCDS on a golf Mkv and it's working fine - so I can assume there is an issue with my car and the comms with the ECU. any ideas what this might be and the fix?

[dantheram]

Also, I think the abs maybe something to do with it - it seems not to be working but without showing the warning light on the dash. I'm confused.

[alexperkins]

You might have a blown fuse. There's a fuse that can affect the diagnostics from memory

[dantheram]

Any ideas which. The ECU fuse?

[alexperkins]

http://www.uk-polos.net/view ... 12&t=46898

Check 31,36 and 37 to start with

[dantheram]

All present and correct

[alexperkins]

I'd check every fuse and see how you go

[dantheram]

All in working order, any other causes?

[alexperkins]

Faulty ECU on the rare occasion can cause it

Make sure there no damaged wires going to the diagnostic socket .

[dantheram]

Faulty ECU on the rare occasion can cause it

Make sure there no damaged wires going to the diagnostic socket .

How do I get to the wiring for the diagnostics - still have this problem. So annoying, it's worked for years now it's just totally f****d.

[dantheram]

Disconnected the battery - still no joy.

I was thinking - if the ecu had become faulty surely I'd have some symptoms? Such an infruriating problem because the fix is totally invisible