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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - EMTC >> Diagnostic Routine(S) >> Diagnostic Routine O >> Diagnostic Overview >> Normal Operation and Fault Conditions

Normal Operation and Fault Conditions

When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered to the blower motor and the blower motor speed control from the relay. Ground for the motor is provided from the blower motor speed control. Ground is provided for the blower control module. The HVAC module sends a PWM signal to the blower motor speed control to control the blower speed.

DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
B10AF:12 Blower Fan Relay: Circuit Short to Battery This CMDTC  sets when the HVAC module senses a short to voltage on the relay coil ground circuit when the module is grounding the circuit.
B10AF:13 Blower Fan Relay: Circuit Open This CMDTC  sets when the HVAC module senses no voltage on the relay coil ground circuit.
B10B9:14 Blower Control: Circuit Short to Ground or Open This CMDTC  and on-demand DTC sets when the HVAC module senses no voltage or an open on the blower motor control PWM circuit.
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