I would clean the switch for a first step. Just pry it carefully out of the dash with a small flathead screwdriver, it snaps into place. However I would suspect the relay is on the fritz, I wish I could tell you where it is located but I'm at work

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth