B1A64:11

Climate Control System

Pinpoint Test F: DTCs B1A63:11 and 15 or DTCs B1A64:11 and 15

Refer to Wiring Diagram Set 55, 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. 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 15 OR DTCs B1A64:11 AND 15

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 C286-4, circuit RH107 (GN/BU), 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.

F2 CHECK CIRCUITS VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: HVAC Module- Dual Automatic Temperature Control (DATC) C228A.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.

- 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.

F3 CHECK CIRCUIT RH107 (GN/BU) FOR AN OPEN

- Ignition OFF.

- Measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228A-4, circuit RH107 (GN/BU), harness side and sunload sensor C286-4, circuit RH107 (GN/BU), harness side.





Is the resistance less than 5 ohms?

Yes
GO to F4.

No
REPAIR circuit RH107 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

F4 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR AN OPEN

- Measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-8, circuit VH416 (VT/GY), harness side and sunload sensor C286-3, circuit VH416 (VT/GY), harness side.





- Measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228B-11, 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.

F5 CHECK CIRCUIT VH417 (YE/OG) OR VH416 (VT/GY) FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228A.

- Disconnect: HVAC Module- DATC (Dual Automatic Temperature Control) C228B.

- 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) and VH416 (VT/GY) for a short to circuit RH107 (GN/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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.