B1A64:15
Climate Control System
Pinpoint Test F: DTCs B1A63:11 and B1A63:15 or DTCs B1A64:11 and B1A64:15
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information [1][2]Diagrams By Number.
Normal Operation
Under normal operation, the sunload sensor receives a ground from the HVAC module. As the light applied to the sensor changes, the PCM detects the change through the RH and LH feedback circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Sunload sensor
- HVAC module
PINPOINT TEST F : DTCs B1A63:11 AND B1A63:15 OR DTCs B1A64:11 AND B1A64:15
F1 CHECK THE SUNLOAD SENSOR REFERENCE VOLTAGE
- Ignition OFF.
- Disconnect: Sunload Sensor C2360.
- Ignition ON.
- Press the AUTO button.
- Measure the voltage between sunload sensor C2360-4, circuit GD116 (BK/VT), harness side and sunload sensor:
- For DTC B1A63, C2360-1, circuit VH417 (YE/OG), harness side.
- For DTC B1A64, C2360-3, 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.
F2 CHECK CIRCUITS VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Ignition ON.
- Measure the voltage between ground and sunload sensor:
- For DTC B1A64:11, C2360-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C2360-1, 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.
F3 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
NOTE: Failure to disconnect the battery will result in false resistance readings.
- Ignition OFF.
- Disconnect the battery.
- Measure the resistance between ground and sunload sensor C2360-4, 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.
F4 CHECK CIRCUIT VH417 (YE/OG) OR CIRCUIT VH416 (VT/GY) FOR AN OPEN
- Measure the resistance between HVAC module C294B-8, circuit VH416 (VT/GY), harness side and sunload sensor C2360-3, circuit VH416 (VT/GY), harness side.
- Measure the resistance between HVAC module C294B-11, circuit VH417 (YE/OG), harness side and sunload sensor C2360-1, 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.
F5 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module C294A.
- Disconnect: HVAC Module C294B.
- Measure the resistance between ground and sunload sensor:
- For DTC B1A64:11, C2360-3, circuit VH416 (VT/GY), harness side.
- For DTC B1A63:11, C2360-1, circuit VH417 (YE/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to F6.
No
REPAIR circuits VH417 (YE/OG) and VH416 (VT/GY) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
F6 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC 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.