Disconnect the plug that connects to the blower resistor. Using a voltmeter set to ohms, connect the black lead to ground. Utilizing the red lead back probe terminals 1 (Lt Green/White wire) (selector set to Med Low), 2 (Black wire), & 3 (Yellow/Red wire) (selector set to Med High). Each should show continuity or 0 -.2 ohms. If they read infinity or greater than 1 ohm there may be a problem with the function selector switch or its connector.
Last edited by Rev; 11-14-2015 at 07:19 PM.