Switch-Blower Motor: Operation
WARNING: This page is about a different car, the 2005 Dodge Pickup and 2005 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The blower motor switch provides a ground path through the A/C-heater control. The blower motor switch directs the ground path through the appropriate blower motor resistor wires, as required to achieve the selected blower motor speed.
The blower motor switch is diagnosed using a DRBIII® scan tool (Refer to DIAGNOSIS AND TESTING and to HVAC - ELECTRICAL DIAGNOSTICS for more information).
The blower motor switch cannot be repaired and, if faulty or damaged, the entire A/C-heater control must be replaced (Refer to HEATING & AIR CONDITIONING/CONTROLS/CONTROL-A/C HEATER - REMOVAL) .