The Cruise Control on my 2002 Forester S stopped working recently. For some time I had problems engaging the CC altogether, requiring multiple clicks on the activation push-button. Then it stopped working completely.

On a retrospect, I may have confused a possibly-bad CC (on-wheel) lever with the button.

Anyway, the green and amber bulbs of the button died some time ago, and I thought maybe the burnt bulb opens the circuit, so it cannot be engaged. Searching for replacement reference, I found replacement bulbs at RadioShack, and this week I finally had the time to replace the bulbs on the CC switch, and on the way, the wipers de-icer.

Unfortunately, replacing the bulbs did not solve the problem, and the CC does not engage. How can I troubleshoot the problem source? How do I know if this is the lever, wiring or the module itself (whatever this one may be)?

  • It's going to be in one of two places: Either the cruise control motor is bad, or the switch you use to set your speed is bad (Not the one on the dash which turns it on, but the one which you actually use to set it). My vote would be on the switch, not the control motor, but I'll wait on @BobCross to respond as he's the Subie guru. Oct 20, 2014 at 22:01
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    Thanks. Yes, my bet is the switch (which I called the lever) too. But, before initiating a follow-up question on how to get to that switch, I started with the basic how-to.
    – ysap
    Oct 20, 2014 at 22:22
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    Could also be brake switch that turns off cruise control when brakes are applied. On my Ford, it was a switch on brake master cylinder. Brake fluid had invaded switch and caused it to initially work intermittently and later fail. Oct 23, 2014 at 0:20
  • @philcolbourn - thanks, good idea. Any idea how to diagnose that? How do I access that switch?
    – ysap
    Oct 23, 2014 at 0:32
  • I found this diagram - perhaps you could find another that is exactly how your car is set up. subaruoutback.org/forums/80-electrical-electronics/… Oct 25, 2014 at 4:12


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