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41canine · 05-06-2008, 06:40 AM

I had exactly the same problem on my '99 Silverado. Instead of replacing the switch, I EASILY took it apart, cleaned the contact board and the brass buttons with a cue tip and alcohol and put it back together. Like a gummy TV remote control. Approx. 15 minutes start to finsh and it's fine. No more "Service 4WD" and all buttons work as designed. It's been about a month now and no problems.

05-06-2008, 06:40 AM	#11
41canine Registered User Status: Offline Join Date: Mar 2008 Member ID: 85993 Pics: My Gallery Location: Western New York Posts: 29	Re: Push buttons vs. encoder motor I had exactly the same problem on my '99 Silverado. Instead of replacing the switch, I EASILY took it apart, cleaned the contact board and the brass buttons with a cue tip and alcohol and put it back together. Like a gummy TV remote control. Approx. 15 minutes start to finsh and it's fine. No more "Service 4WD" and all buttons work as designed. It's been about a month now and no problems.