Pinpoint Test S: B1A63:11, B1A63:15, B1A64:11, B1A64:15

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

Normal Operation and Fault Conditions

The sunload sensor supplies information to the HVAC control module indicating the sunload intensity on the vehicle and the HVAC control module adjusts the system based on that information.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1A63:11	Right Solar Sensor: Circuit Short To Ground	Module senses a short to ground from the right sunload sensor feedback circuit.
HVAC B1A63:15	Right Solar Sensor: Circuit Short To Battery Or Open	Module senses an open or a short to voltage from the right sunload sensor feedback circuit.
HVAC B1A64:11	Left Solar Sensor: Circuit Short To Ground	Module senses a short to ground from the left sunload sensor feedback circuit.
HVAC B1A64:15	Left Solar Sensor: Circuit Short To Battery Or Open	Module senses an open or a short to voltage from the left sunload sensor feedback circuit.

Possible Sources

Wiring, terminals or connectors
Autolamp and sunload 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.

S1 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect sunload sensor C286.

Disconnect HVAC control module C228A and C228B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C286-1	Courtesy of FORD MOTOR COMPANY	Ground
C286-2	Courtesy of FORD MOTOR COMPANY	Ground
C286-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	INSTALL a new autolamp and sunload sensor. REFER to: Sunload Sensor .

GO to S2

S2 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C286-1	Courtesy of FORD MOTOR COMPANY	Ground
C286-2	Courtesy of FORD MOTOR COMPANY	Ground
C286-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to S3

No	REPAIR the circuit.

S3 CHECK THE SUNLOAD SENSOR CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C286-1	Courtesy of FORD MOTOR COMPANY	C228B-24
C286-2	Courtesy of FORD MOTOR COMPANY	C228B-25

Positive Lead	Measurement / Action	Negative Lead
C286-3	Courtesy of FORD MOTOR COMPANY	C228A-26

Are the resistances less than 3 ohms?

Yes

GO to S4

No	REPAIR the circuit.

S4 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C286-1	Courtesy of FORD MOTOR COMPANY	C286-2
C286-1	Courtesy of FORD MOTOR COMPANY	C286-3
C286-2	Courtesy of FORD MOTOR COMPANY	C286-3

Are the resistances greater than 10, 000 ohms?

Yes	INSTALL a new sunload sensor. Refer to the appropriate procedure in REMOVAL AND INSTALLATION .CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. If the DTC returns, GO to S5

No	REPAIR the circuits.

S5 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 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.