I have the same problem...this is info I found....
the switch is located just to the right behind the left driver side speaker. you can either take the speaker off to see the switch or stick your right arm in the little panel that comes off under the steering wheel. If you put your right arm up in there just up until it is about to the right of the speaker you should be able to feel it above the magnet. it is kind of small and if you want to risk the aggravation of taking the speaker out then you wont have to fumble in the dark with your hand. happy hunting!
Robin
June 2006