Pinpoint Test X : B105A:12, B105A:14, B1A61:11, B1A61:15, B1A69:11, B1A69:15, B1A69:92

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

If equipped with in-vehicle temperature and humidity sensor, it contains a thermistor and a sensing element which separately measures the in-vehicle air temperature and the humidity, then sends those readings to the HVAC control module. The in-vehicle temperature and humidity sensor has an electric fan within the sensor that draws in-vehicle air across the two sensing elements. The HVAC control module may adjust the air inlet door based on the in-vehicle temperature and humidity sensor information to maintain the desired humidity of the passenger cabin air.

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 (CMDTC) 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 (CMDTC) 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 (CMDTC) 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 (CMDTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor.
HVAC B1A69:11	Humidity Sensor: Circuit Short To Ground	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the humidity sensor circuit.
HVAC B1A69:15	Humidity Sensor: Circuit Short To Battery Or Open	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the humidity sensor circuit.
HVAC B1A69:92	Humidity Sensor: Performance Or Incorrect Operation	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses the wrong humidity sensor value.

Possible Sources

Fuse
Wiring, terminals or connectors
In-vehicle temperature and humidity 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.

X1 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect in-vehicle temperature and humidity sensor C2247.

Disconnect BCM fuse 2 (5A).

Disconnect HVAC control module C2357A.

Disconnect HVAC control module C2357B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2247-1	Courtesy of FORD MOTOR COMPANY	Ground
C2247-2	Courtesy of FORD MOTOR COMPANY	Ground
C2247-3	Courtesy of FORD MOTOR COMPANY	Ground
C2247-4	Courtesy of FORD MOTOR COMPANY	Ground
C2247-5	Courtesy of FORD MOTOR COMPANY	Ground
C2247-6	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.

GO to X2

X2 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2247-1	Courtesy of FORD MOTOR COMPANY	Ground
C2247-2	Courtesy of FORD MOTOR COMPANY	Ground
C2247-3	Courtesy of FORD MOTOR COMPANY	Ground
C2247-4	Courtesy of FORD MOTOR COMPANY	Ground
C2247-5	Courtesy of FORD MOTOR COMPANY	Ground
C2247-6	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to X3

No	REPAIR the circuit in question.

X3 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR AN OPEN CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2247-3	Courtesy of FORD MOTOR COMPANY	C2357A-3
C2247-5	Courtesy of FORD MOTOR COMPANY	C2357A-2

Positive Lead	Measurement / Action	Negative Lead
C2247-1	Courtesy of FORD MOTOR COMPANY	C2357B-27
C2247-2	Courtesy of FORD MOTOR COMPANY	C2357B-29
C2247-4	Courtesy of FORD MOTOR COMPANY	C2357B-19

Positive Lead	Measurement / Action	Negative Lead
C2247-6	Courtesy of FORD MOTOR COMPANY	BCM fuse 2 (5A) cavity, (component side)

Are the resistances less than 3 ohms?

Yes	INSTALL a new in-vehicle temperature and humidity sensor. REFER to: In-Vehicle Temperature Sensor . TEST the system for normal operation. If the concern is still present, GO to X4

No	REPAIR the circuit in question.

X4 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 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 module connections. ADDRESS the root cause of any connector or pin issues.