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Cruise control not working after battery exchange

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Do you have the Duarmetric program to erase faults...  That might be one shot, is Loren suggesting that if you had a bad lamp that would make the C/C in-op?  Have you depress the button on the end of the windshield stalk.  I think that's right?

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I seem to remember this - check your brake lights, all of them including the middle light in the spoiler.  Manually cycle your spoiler up to engage the middle brake light and make sure they all work.  There are also two switches that disengage the cruise control (but do not turn it off which appears to be your problem).  One is the clutch pedal switch  and one is the brake pedal switch.  But I don't think your problem lies there.  You did check Fuse B-7...right?  Anything else strange happening electrically with the car?


There are two switches on the clutch pedal. There is another switch that senses the clutch is not depressed (it is located on top of the clutch pedal) This switch has to be made (clutch in up position) in order to turn the CC on. From my reading, the upper switch must be engaged for the CC to even turn on.  Check the plastic plunger on the upper switch.

Edited by DBJoe996
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What is the exact model and year of the car?  (Just to know if it is mechanical throttle or eGas). 


If it is eGas, I think you should get it hooked up to a Porsche tester.  It may possibly have lost its coding when the battery was changed.  Also, you will be able to test the stalk and switch input signals.  For example, the brake light switch has two sets of contacts (one normally open, and one normally closed) so although the brake lights might work, the cruise may not.


The mechanical throttle cruse control is completely different, and there are no diagnostics available with a Porsche tester.

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Update on my previous update: After removing and reinserting key into ignition, the cc is working perfectly. I have no doubt that the clutch switch was defective, as the plunger was stuck and would not compress or release. Hoping for continued good luck. I was afraid I was going to have to replace the stalks. Thank everyone for taking the time to help me out. I really appreciated your suggestions. I will keep you posted of any further developments. Hopefully there won't be any!

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