Pinpoint Test D : B1A61:11, B1A61:15, B1A69:11, B1A69:15

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

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

D1 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: In-Vehicle Temperature and Humidity Sensor C233.

Disconnect: BCM C2280B.

Disconnect: HVAC control module - EATC C228A.

Disconnect: HVAC control module - EATC C228B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C233-2	Courtesy of FORD MOTOR COMPANY	Ground
C233-3	Courtesy of FORD MOTOR COMPANY	Ground
C233-4	Courtesy of FORD MOTOR COMPANY	Ground
C233-5	Courtesy of FORD MOTOR COMPANY	Ground
C233-6	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.
No	GO to D2.

D2 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C233-2	Courtesy of FORD MOTOR COMPANY	Ground
C233-3	Courtesy of FORD MOTOR COMPANY	Ground
C233-4	Courtesy of FORD MOTOR COMPANY	Ground
C233-5	Courtesy of FORD MOTOR COMPANY	Ground
C233-6	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes	GO to D3.
No	REPAIR the circuit in question.

D3 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C233-1	Courtesy of FORD MOTOR COMPANY	Ground

Positive Lead	Measurement / Action	Negative Lead
C233-1	Courtesy of FORD MOTOR COMPANY	C228C-8

Positive Lead	Measurement / Action	Negative Lead
C233-2	Courtesy of FORD MOTOR COMPANY	C228B-29
C233-4	Courtesy of FORD MOTOR COMPANY	C228B-18

Positive Lead	Measurement / Action	Negative Lead
C233-3	Courtesy of FORD MOTOR COMPANY	C228A-24
C233-5	Courtesy of FORD MOTOR COMPANY	C228A-23

Positive Lead	Measurement / Action	Negative Lead
C233-6	Courtesy of FORD MOTOR COMPANY	C2280B-7

Are the resistances less than 3 ohms?

Yes	GO to D4.
No	REPAIR the circuit in question.

D4 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C233-1	Courtesy of FORD MOTOR COMPANY	C233-2
C233-1	Courtesy of FORD MOTOR COMPANY	C233-3
C233-1	Courtesy of FORD MOTOR COMPANY	C233-4
C233-1	Courtesy of FORD MOTOR COMPANY	C233-5
C233-1	Courtesy of FORD MOTOR COMPANY	C233-6
C233-2	Courtesy of FORD MOTOR COMPANY	C233-3
C233-2	Courtesy of FORD MOTOR COMPANY	C233-4
C233-2	Courtesy of FORD MOTOR COMPANY	C233-5
C233-2	Courtesy of FORD MOTOR COMPANY	C233-6
C233-3	Courtesy of FORD MOTOR COMPANY	C233-4
C233-3	Courtesy of FORD MOTOR COMPANY	C233-5
C233-3	Courtesy of FORD MOTOR COMPANY	C233-6
C233-4	Courtesy of FORD MOTOR COMPANY	C233-5
C233-4	Courtesy of FORD MOTOR COMPANY	C233-6
C233-5	Courtesy of FORD MOTOR COMPANY	C233-6

Are the resistances greater than 10, 000 ohms?

Yes	INSTALL a new in-vehicle temperature and humidity sensor. REFER to Climate Control . TEST the system for normal operation. If the concern is still present, GO to D5.
No	REPAIR the circuits in question.

D5 CHECK FOR CORRECT HVAC CONTROL MODULE OPERATION

Disconnect and inspect all HVAC control module connectors.

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

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

Operate the system and verify the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new HVAC control module. REFER to Climate Control .
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.