B1230

DTC Troubleshooting: B1230 (F)

DTC B1230 or DTC indicator F:

A Short in the Sunlight Sensor Circuit

1. Clear the DTC with the HDS.

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS or the self-diagnostic function.

Is DTC B1230 or F indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the sunlight sensor circuit.�

4. Turn the ignition switch to LOCK (0).

5. Disconnect the sunlight sensor 2P connector.

6. Disconnect the climate control unit 30P connector.

7. Check for continuity between body ground and climate control unit 30P connector terminal No. 10.





Is there continuity?

YES -

Repair a short to body ground in the wire between the climate control unit and the sunlight sensor.�

NO -

Go to step 8.

8. Check for continuity between climate control unit 30P connector terminals No. 10 and No. 22.





Is there continuity?

YES -

Repair a short in the wires between the climate control unit and the sunlight sensor.�

NO -

Go to step 9.

9. Reconnect the sunlight sensor 2P connector.

10. Reconnect the climate control unit 30P connector.

11. Test the sunlight sensor Sunlight Sensor Test (With Climate Control).

Is the sunlight sensor OK?

YES -

Substitute a known-good climate control unit Climate Control Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original climate control unit Climate Control Unit Removal/Installation.�

NO -

Replace the sunlight sensor Service and Repair.�