Pinpoint Test L: The Front Blower Motor Is Inoperative

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

Normal Operation and Fault Conditions

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

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10AF:11	Blower Fan Relay: Circuit Short To Ground	Module senses low voltage on the relay coil voltage circuit when the module is energizing the circuit. Blower relay is permanently inactive.
HVAC B10AF:15	Blower Fan Relay: Circuit Short To Battery Or Open	Module senses greater than expected voltage on the blower 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.

Possible Sources

Fuse
Wiring, terminals or connectors
Blower motor relay (non-serviceable, part of the BJB)
Blower motor
Blower motor switch
HVAC control module

Visual Inspection and Pre-checks

Make sure BJB fuse 89 (40A) is OK.

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

L1 CHECK THE BLOWER MOTOR RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect BJB C1035A.

Disconnect HVAC control module C228B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1035A-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to L2

No	REPAIR the circuit.

L2 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN

NOTE: Some vehicles may be equipped with a diode in the blower motor relay coil ground circuit. Make sure the multimeter leads are correctly attached during testing or a false reading will occur causing misdiagnosis of the circuit. For additional information, refer to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1035A-1	Courtesy of FORD MOTOR COMPANY	C228B-18

Is the resistance less than 3 ohms?

Yes

GO to L3

No	REPAIR the circuit.

L3 CHECK FOR VOLTAGE TO THE FRONT BLOWER MOTOR

Disconnect blower motor C2004.

Measure:

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

Is the voltage greater than 11 volts?

Yes

GO to L4

No	REPAIR the circuit.

L4 CHECK FOR GROUND TO THE FRONT BLOWER MOTOR

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 the appropriate procedure in REMOVAL AND INSTALLATION .

GO to L5

L5 CHECK THE CIRCUIT BETWEEN THE FRONT BLOWER MOTOR AND THE FRONT BLOWER MOTOR SWITCH FOR AN OPEN

Ignition OFF.

Disconnect HVAC control module C228C.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2004-2	Courtesy of FORD MOTOR COMPANY	C228C-4

Is the resistance less than 3 ohms?

Yes

GO to L6

No	REPAIR the circuit.

L6 CHECK THE FRONT BLOWER MOTOR SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C228C-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to L7

No	REPAIR the circuit.

L7 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 service articles: 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 the appropriate procedure in REMOVAL AND INSTALLATION .

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.