F and AUTO

DTC Troubleshooting: B1230 (F and AUTO)

DTC B1230 or DTC indicator F and AUTO:

A Short in the Sunlight Sensor Circuit

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Climate Control System or self-diagnostic function How to Troubleshoot the Climate Control System.

Is DTC B1230 or F and AUTO indicated?

YES -

Go to step 4.

NO -

Intermittent failure.�

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

5. Test the sunlight sensor Sunlight Sensor Test.

Is the sunlight sensor OK?

YES -

Go to step 6.

NO -

Replace the sunlight sensor Service and Repair.�

6. Disconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).

7. Disconnect the front climate control unit 30P connector.

8. Check for continuity between front climate control unit 30P connector terminal No. 20 and body ground.





Is there continuity?

YES -

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

NO -

Go to step 9.

9. Check for continuity between front climate control unit 30P connector terminals No. 20 and No. 29.





Is there continuity?

YES -

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

NO -

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