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Have a 2003 996 C4S and my cruise control stopped working recently. At first, it wouldn't hold but light would illuminate then now light will not illuminate and and still not hold. Fuse checked good but I need to know how many relays are involved and where are they located on the relay board and else where. Any other suggestion would also be helpful too.

TIA! helpsmilie.gif

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Have a 2003 996 C4S and my cruise control stopped working recently. At first, it wouldn't hold but light would illuminate then now light will not illuminate and and still not hold. Fuse checked good but I need to know how many relays are involved and where are they located on the relay board and else where. Any other suggestion would also be helpful too.

TIA! helpsmilie.gif

A failed, failing (intermittent) rear brake light will result in disabling the CC. Upgrading to LEDs, especially the high mount, will simulate an open brake light bulb/circuit.

Edited by wwest

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There are no relays involved. The control is all done within the instrument cluster and DME electronics. As well as the brake light switch wwest mentions, also check the clutch switch.

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Have a 2003 996 C4S and my cruise control stopped working recently. At first, it wouldn't hold but light would illuminate then now light will not illuminate and and still not hold. Fuse checked good but I need to know how many relays are involved and where are they located on the relay board and else where. Any other suggestion would also be helpful too.

TIA! helpsmilie.gif

read a posting last week about how a floor mat prevented the clutch pedal switch from working and so the car wouldn't start. could your problem be in the clutch switch?

ps: just looked at the recent posts.... hope the problem is the clutch switch as I understand it is a relatively simple fix. good luck....

Edited by judgejon

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Keep in mind that the "Cruise Control" clutch pedal switch is not the same as the "Ignition Interrupter" switch on the same pedal. You need to find the same type of switch as on the brake pedal, but with a Red colored body.

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Have a 2003 996 C4S and my cruise control stopped working recently. At first, it wouldn't hold but light would illuminate then now light will not illuminate and and still not hold. Fuse checked good but I need to know how many relays are involved and where are they located on the relay board and else where. Any other suggestion would also be helpful too.

TIA! helpsmilie.gif

Great knowledgeable answer by RFM. Be sure to post up the solution that fixes your cruise control, please. good luck.....

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My cruise control will not hold either.  When you turn on ignition Green light on dash lights then goes out.  When pushing in the button to turn on cruise dash light lights as long as I hold the button in.  All brake lights are functioning and I have replaced the Clutch Switch (which was fine anyways).   If I hold in the on switch cruise will engage and work but as soon as I let off the dash light goes out and cruise disengages. 

Edited by yawlcat

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Same problem as post above. Took in to local Porsche dealer -- he told me I needed a new steering column --  cost in excess of $1000. At that point I decided I could live without cruise control. Everything else works fine.

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Same problem as post above. Took in to local Porsche dealer -- he told me I needed a new steering column --  cost in excess of $1000. At that point I decided I could live without cruise control. Everything else works fine.

 I can not imagine what the steering column has to do with the cruise control, the switch on the column is a separate part and thus to order and assemble separately. $ 1000 my god.

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Don't do it.  RFM is right, how could this issue be related to the "steering column."  Even in the older cars, the turn signal/bright lights assembly merely attached to the steering column.  The cruise control is electronic and has nothing to do with the steering of the car.  Check this out with a good indie shop before you accept the dealer recommendation.  The cruise control push button on/off is located at the end of the cruise control lever, right?  I can't believe that the cruise control assembly is somehow permanently attached to the steering column itself.  Can you get a schematic book of the column?  I'd bet it's a part that goes on and off.  Good luck.

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Had the same symptoms in my 2000 Boxster. The CC bulb in the dash had come loose or was going bad. I replaced the bulb and solved the problem.

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It seems like it's just the latching mechanism on the switch. Push once, latches on, push again turns off - since it lights and the cc operates if you hold the switch, the contact is being made, the switch just isn't latching. I would take the stalk apart and see if there's a part # on the switch. Here's a link to the diagram for the parts in question http://www.autoatlanta.com/porsche-parts/hardparts.php?dir=996-99-05&section=903-10 it doesn't show the switch in question per se', but it could be one of the items labeled "cap"...FWIW the whole "column/switch assembly" is only $521.00 so...Good luck

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It  seems that the switch is just a momentary and not a latching switch.  Would have to be a momentary that would send a pulse to the computer to turn on. That way when you turn car off cruise goes off.  A latching switch in this situation would not make sense.  Appears to be a logic issue... Perhaps there is an issue in the  DME programming. 

Edited by yawlcat

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Found this on a sixspeeed forum

 

 

"I have seen in 2-3 cases where customers have disconnected and reconnected their batteries many times in a short amount of time or a battery dies multiple times that cc coding is lost. Usually this would be accompanied by an error in the DME or Gauge cluster that would reference the "EEprom"

Edited by yawlcat

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