HI I AM HAVING AN ISSUE WITH A 98 BLAZER, 4X4 3 BUTTON DASH SWITCH, IN PARK OR DRIVING WHEN YOU PUSH 4H NOTHING HAPPENS(NO LIGHTS).IF YOU STOP AND PUT IT IN NEUTRAL AND YOU PUSH 4H THE 4H AND 4L BUTTONS FLASH A FEW TIMES THEN IT GOES BACK TO 2H.IF YOU PUSH 4L IT DOES ENGAGE IN 4L BUT THE 4H AND 4L LIGHTS BOTH STAY LIT.I CANNOT GET IT TO GO IN 4H.I DID SOME TROUBLESHOOTING BY CROSSING OVER THE DLC PIN 13, AND THE LIGHTS ON THE SWITCH WOULD ALL THRE FLASH 2 TIMES, SO IM ASSUMING THAT MEANS TCCM CODE 2? WHICH I THINK IS ENCODER MOTOR.I DID SEE SOME SOME INFO ON HERE ABOUT TESTING THE SWITCH COULD BE FOUND IN THE TECH ARTICLE SECTION BUT IM HAVING TROUBLE FINDING THAT SECTION ON THIS SITE,IM SURE ITS RIGHT IN FRONT OF ME BUT I CANT LOCATE IT?.ALSO COULD IT BE THE ENCODER MOTOR IF IT IS STILL ENGAGING IN 4L JUST NOT 4H?, I HAVE RULED OUT VAC LINES SINCE IT DOES LOCK IN 4L?i KNOW I DO HEAR A WEIRD NOISE ALMOST AS A VAC ACTUATOR BEHIND THE RADIO EVERYTIME I PUSH THE BUTTONS BUT I DIDNT THINK THERE WAS ANYTHING TO DO WITH THE SYSTEM THERE?ALSO IF IT HELPS IT HAS BEEN WORKING ALL WINTER IT JUST RECENTLY STARTED ACTING UP,DIDNT MEAN TO CONFUSE ANYONE WITH ALL THE QUESTIONS BUT ANY HELP WOULD BE APPRECIATED,THE 4X4 HAS DEF BEEN NEEDED THIS YEAR IN INDIANA. THANKS