Pinpoint Test N : B105A:12, B105A:14, B1A61:11, B1A61:15

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.

Automatic Climate Control System for schematic and connector information.

Normal Operation and Fault Conditions

The in-vehicle temperature sensor (if equipped) contains a thermistor which measures the in-vehicle air temperature and sends the readings to the HVAC control module. The in-vehicle temperature sensor has an electric fan within the sensor that draws in-vehicle air across the sensing element.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B105A:12	Cabin Temperature Sensor Fan: Circuit Short To Battery	This Continuous Memory Diagnostic Trouble Code (CM DTC) sets when the HVAC control module senses unexpected voltage on the circuit for the cabin temperature sensor fan.
HVAC B105A:14	Cabin Temperature Sensor Fan: Circuit Short To Ground Or Open	This Continuous Memory Diagnostic Trouble Code (CM DTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor fan.
HVAC B1A61:11	Cabin Temperature Sensor: Circuit Short To Ground	This Continuous Memory Diagnostic Trouble Code (CM DTC) sets when the HVAC control module senses erratic voltages from the cabin temperature sensor circuit.
HVAC B1A61:15	Cabin Temperature Sensor: Circuit Short To Battery Or Open	This Continuous Memory Diagnostic Trouble Code (CM DTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor.

Possible Sources

Fuse
Wiring, terminals or connectors
In-vehicle temperature sensor
HVAC control module

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

N1 CHECK THE IN-VEHICLE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect in-vehicle temperature sensor C2247.

Disconnect BCM fuse 2 (5A).

Disconnect HVAC control module C294A.

Disconnect HVAC control module C294B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-2	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-5	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-6	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.

GO to N2

N2 CHECK THE IN-VEHICLE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-2	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-5	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2247-6	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to N3

No	REPAIR the circuit in question.

N3 CHECK THE IN-VEHICLE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Refer to C294B-23
Refer to C2247-2	Courtesy of FORD MOTOR COMPANY	Refer to C294B-25

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-5	Courtesy of FORD MOTOR COMPANY	Refer to C294A-2

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-6	Courtesy of FORD MOTOR COMPANY	BCM fuse 2 (5A)

Are the resistances less than 3 ohms?

Yes

GO to N4

No	REPAIR the circuit in question.

N4 CHECK THE IN-VEHICLE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Refer to C2247-2
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Refer to C2247-5
Refer to C2247-1	Courtesy of FORD MOTOR COMPANY	Refer to C2247-6
Refer to C2247-2	Courtesy of FORD MOTOR COMPANY	Refer to C2247-5
Refer to C2247-2	Courtesy of FORD MOTOR COMPANY	Refer to C2247-6
Refer to C2247-5	Courtesy of FORD MOTOR COMPANY	Refer to C2247-6

Are the resistances greater than 10, 000 ohms?

Yes	INSTALL a new in-vehicle temperature sensor. REFER to: In-Vehicle Temperature Sensor . TEST the system for normal operation. If the concern is still present, GO to N5

No	REPAIR the circuits necessary.

N5 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.

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

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) 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 module connections. ADDRESS the root cause of any connector or pin issues.