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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1092 (Climate Control System - General Information (2 Of 2)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Test(s) >> Pinpoint Test U : The Rear Blower Motor Is Inoperative >> Notes

Pinpoint Test U : The Rear Blower Motor Is Inoperative: Notes

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagram Auxiliary Climate Control for schematic and connector information.

Normal Operation and Fault Conditions 

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

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
B10B0:11 Rear 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.
B10B0:15 Rear 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.
B10BA:12 Rear Blower Control: Circuit Short To Battery This DTC sets when the module senses high voltage on the rear blower motor control PWM circuit, indicating a short directly to voltage. The rear blower motor is inoperative.
B10BA:14 Rear Blower Control: Circuit Short To Ground or Open This DTC sets when the module senses no voltage on the rear blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The rear blower motor runs at full speed if the circuit is shorted to ground. The rear blower motor is inoperative if the circuit is open.

Possible Sources 

Visual Inspection and Diagnostic Pre-checks 

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