Pinpoint Test J : The Blower Motor Is Inoperative

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

Refer to MANUAL CLIMATE CONTROL SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10AF:11	Blower Fan Relay: Circuit Short To Ground	This DTC sets when the HVAC control module senses no voltage change on the blower motor relay coil control circuit when the module attempts to engage the relay, indicating a short directly to ground. The blower motor is inoperative.
HVAC B10AF:15	Blower Fan Relay: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module senses no ground on the blower motor relay coil control circuit when the module attempts to engage the relay, indicating an open circuit or a short directly to voltage. The blower motor is inoperative when the relay control circuit is open. The blower motor is always on when the relay control circuit is shorted to voltage.
HVAC B10B9:12	Blower Control: Circuit Short To Battery	This DTC sets when the HVAC control module senses excessive voltage on the blower motor speed control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative.
HVAC B10B9:14	Blower Control: Circuit Short To Ground Or Open	This DTC sets when the HVAC control module senses no voltage on the blower motor speed control PWM circuit, indicating an open or a short directly to ground. The blower motor is inoperative.

Possible Sources

Wiring, terminals or connectors
Blower motor relay
Blower motor
Blower motor speed control
HVAC control module

Visual Inspection and Pre-checks

Inspect BJB fuse 6 (40A).

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

J1 CHECK THE BLOWER MOTOR RELAY FUNCTIONALITY
- Ignition OFF.
- Disconnect Blower motor relay.
- Carry out the component test on the blower motor relay. Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for schematic and connector information.
Did the relay pass the component test?

Yes GO to J2

No INSTALL a new blower motor relay.

J2 CHECK THE BLOWER MOTOR RELAY COIL GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
Blower motor relay socket 2 (component side)	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to J3

No	REPAIR the circuit.

J3 CHECK THE BLOWER MOTOR RELAY SWITCH CONTACT SUPPLY VOLTAGE

Measure:

Positive Lead	Measurement / Action	Negative Lead
Blower motor relay socket 3 (component side)	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to J4

No	VERIFY BJB fuse 6 (40A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

J4 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR A SHORT TO GROUND

Disconnect HVAC control module C2357A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Blower motor relay socket 1 (component side)	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to J5

No	REPAIR the circuit.

J5 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
Blower motor relay socket 1 (component side)	Courtesy of FORD MOTOR COMPANY	C2357A-11

Is the resistance less than 3 ohms?

Yes

GO to J6

No	REPAIR the circuit.

J6 CHECK THE BLOWER MOTOR SPEED CONTROL VOLTAGE CIRCUIT FOR AN OPEN

Disconnect Blower motor speed control C297A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Blower motor relay socket 5 (component side)	Courtesy of FORD MOTOR COMPANY	C297A-4

Is the resistance less than 3 ohms?

Yes

GO to J7

No	REPAIR the circuit.

J7 CHECK THE BLOWER MOTOR SPEED CONTROL GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297A-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to J8

No	REPAIR the circuit.

J8 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to J9

J9 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to J10

No	REPAIR the circuit.

J10 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297A-3	Courtesy of FORD MOTOR COMPANY	C2357A-23

Is the resistance less than 3 ohms?

Yes

GO to J11

No	REPAIR the circuit.

J11 CHECK THE OUTPUTS TO THE BLOWER MOTOR

Disconnect Blower motor C2004.

Connect Blower motor relay.

Connect Blower motor speed control C297A.

Connect HVAC control module C2357A.

Ignition ON.

Select PANEL on the HVAC controls.

Select the highest blower motor setting.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2004-1	Courtesy of FORD MOTOR COMPANY	C2004-2

Is the voltage greater than 11 volts?

Yes	INSTALL a new blower motor. REFER to: Blower Motor .

GO to J12

J12 CHECK THE CIRCUITS TO THE BLOWER MOTOR FOR AN OPEN

Ignition OFF.

Disconnect Blower motor speed control C297B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297B-1	Courtesy of FORD MOTOR COMPANY	C2004-1
C297B-2	Courtesy of FORD MOTOR COMPANY	C2004-2

Are the resistances less than 3 ohms?

Yes

GO to J13

No	REPAIR the circuit in question.

J13 CHECK THE BLOWER MOTOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C297B-1	Courtesy of FORD MOTOR COMPANY	C297B-2

Is the resistance greater than 10, 000 ohms?

Yes	INSTALL a new blower motor speed control. REFER to: Blower Motor Speed Control . TEST the system for normal operation. If the concern is still present, GO to J14

No	REPAIR the circuits.

J14 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .

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.