If it's the same as my 95 the factory manual shows the following: Remove the switch after disconnecting the battery and waiting a few minutes. looking at the switch connection with it turned so that the internal rib slot is down ,the pins are numbered 1thru 4 left to right . Check for continuity between pins as follows: with switch off(1&4)switch on(1&4,1&2,2&4)on and set(1&2)on and resume(1&3). For the servo, #1 check fuse 10. #2With ignition on check for battery voltage to fuse 10. #3unplug 4way connector at servo(hold connector with tab down 1thru4 right to left)check for bat. voltage pin 2. No voltage check brake switch. #4with jumper wire between pin 2 on servo and cavity 2 of servo check for bat. voltage at pins 1,3&4 of servo. No voltage replace servo. #5turn ign off. check for ground at pin1 of harness. Hope it helps.