Sumtoc

My CC is out again. First time it was a dirty connector in the engine bay, green on on the left side. Checked the fuse. Removed the clutch switch, tested it, cleaned the contacts, re-installed it, adjusted it. Still not working.

Is there a diagnostic procedure somewhere that will help me troubleshoot the complete CC system?

geolab

I remember I posted a TSB in the 964 section on pcarworkshop concerning cruise control, maybe it will help...

911/Q45

Did you check the brake switch while you were working with the clutch switch?

Sumtoc

GeoLab, I believe your 964 TSB points out the clutch pedal switch which tests Ok and is properly adjusted.

911/Q45, brake lights work Ok, so assumed switch is working properly. Some other test required to check for CC function?

geolab

please go to page 240 out of 1481 of the worshop manual, detailed list to check Cruise Control, regards

2ndof2

+1

Sometimes if the brake light switch isn't adjusted properly it will disengage the cruise. I narrowed it down to this after noticing red flashes of light coming from the 3rd brake light reflecting off the rear seats. Who would've thunk it?