The blower motor wiring in a Freightliner M2 typically utilizes a multi-speed circuit managed by a resistor pack or a pulse-width modulated (PWM) control signal from the HVAC control head
Unlike older systems that use a resistor to drop voltage, the M2's controller rapidly switches the ground or power side (PWM) to vary fan speed. 0;2a; Freightliner M2 Blower Motor Wiring Diagram
18;write_to_target_document7;default0;77b;18;write_to_target_document1a;_VX3uaf-xLv-MwbkP_OqL6Aw_20;92;0;a3; 0;baf;0;64f; Core Wiring and Pin Configuration 0;16; The blower motor wiring in a Freightliner M2