Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) — 2016 workshop reference 3496

appropriate section in Group 415 for the procedure.

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

The Blower Motor Does Not Operate Correctly

Refer to Wiring Diagrams Cell 55 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 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 speed control. Power and ground for the blower motor is provided by the blower motor speed control. The FCIM 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:15 Blower Fan Relay: Circuit Short To Battery or Open	This DTC sets when the module senses greater than expected voltage on the blower relay coil voltage circuit, indicating an open circuit or a short to voltage. Blower relay is inactive when circuit is open; blower relay is on all the time when shorted to battery.
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.

DTC

Description

Fault Trigger Conditions

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 relay coil voltage circuit, indicating an open circuit or a short to voltage. Blower relay is inactive when circuit is open; blower relay is on all the time when shorted to battery.

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

Wiring, terminals or connectors Blower motor relay Blower motor speed control FCIM

PINPOINT TEST L : THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

L1 VERIFY THE BLOWER MOTOR OPERATION

Ignition ON. Select PANEL on the HVAC controls. Adjust the blower motor setting to the minimum and maximum settings.

Does the blower motor operate at any setting?

Yes		GO to L2
No	GO to Pinpoint Test K

Source reference 3496

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.