Pinpoint Test F: DTCs B1A63:11 and 15 or DTCs B1A64:11 and 15
Climate Control System
Pinpoint Test F: DTCs B1A63:11 and 15 or DTCs B1A64:11 and 15
Refer to Wiring Diagram Set 55 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the sunload sensor receives a ground from the HVAC module through circuit GD116 (BK/VT). A 5-volt reference voltage is supplied to the sunload sensor from the HVAC module through circuit VH417 (YE/OG) (RH) and circuit VH416 (VT/GY) (LH).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Sunload sensor
- HVAC module
PINPOINT TEST F: DTCs B1A63:11 AND 15 OR DTCs B1A64:11 AND 15
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F1 CHECK THE SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Sunload Sensor C286.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between sunload sensor C266-4, circuit GD116 (BK/VT), harness side and sunload sensor:
- For DTC B1A63, C286-1, circuit VH417 (YE/OG), harness side.
- For DTC B1A64, C286-3, circuit VH416 (VT/GY), harness side.
- Is the voltage between 4.7 and 5.1 volts?
Yes
INSTALL a new sunload sensor. CLEAR the DTCs. REPEAT the self-test. If the code returns, GO to F6.
No
If diagnosing DTC B1A63:15 or DTC B1A64:15, GO to F2.
If diagnosing DTC B1A63:11 or DTC B1A64:11, GO to F5.
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F2 CHECK CIRCUIT VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C2356a.
- Disconnect: HVAC Module - DATC C2356b.
- Ignition ON.
- Measure the voltage between ground and sunload sensor:
- For DTC B1A64:11, C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C286-1, circuit VH417 (YE/OG), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to F3.
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F3 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and sunload sensor C286-4, circuit GD116 (BK/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to F4.
No
REPAIR circuit GD116 (BK/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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F4 CHECK CIRCUITS VH417 (YE/OG) AND VH416 (VT/GY) FOR AN OPEN
- Measure the resistance between HVAC module - DATC C2356b-6, circuit VH416 (VT/GY), harness side and sunload sensor C286-3, circuit VH416 (VT/GY), harness side.
- Measure the resistance between HVAC module - DATC C2356b-3, circuit VH417 (YE/OG), harness side and sunload sensor C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to F6.
No
REPAIR circuit VH416 (VT/GY) or circuit VH417 (YE/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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F5 CHECK CIRCUIT VH417 (YE/OG) OR CIRCUIT VH416 (VT/GY) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module - DATC C2356a.
- Disconnect: HVAC Module - DATC C2356b.
- Measure the resistance between ground and sunload sensor:
- For DTC B1A64:11, C286-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C286-1, circuit VH417 (YE/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to F6.
No
REPAIR circuits VH417 (YE/OG) or VH416 (VT/GY) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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F6 CHECK THE MODULE CONNECTION
- Inspect the module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVAC module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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