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Pinpoint Test J : The Blower Motor Is Inoperative: Notes

Refer to Manual Climate Control System for schematic and connector information.

Normal Operation and Fault Conditions 

Voltage is supplied to the blower motor relay switched contact from the BJB. Ground to the blower motor relay coil is a dedicated circuit. When the blower motor relay coil receives power from the FCIM, the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor control module. The FCIM sends a PWM signal to the blower motor control module to control the blower motor speed.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
B10AF:11 Blower Fan Relay: Circuit Short To Ground This DTC sets when the module senses low voltage on the blower motor relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is permanently inactive.
B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open This DTC sets when the module senses greater than expected voltage on the blower motor relay coil voltage circuit, indicating an open circuit or a short to voltage. The blower motor relay is inactive when circuit is open; the blower motor relay is on all the time when shorted to battery.
B10B9:12 Blower Control: Circuit Short To Battery This DTC sets when the module senses high voltage on the blower motor control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative.
B10B9:14 Blower Control: Circuit Short To Ground or Open This DTC sets when the module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open.

Possible Sources 

Visual Inspection and Diagnostic Pre-checks 

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