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 with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B1230 or F and AUTO indicated?

YES -

Go to step 5.

NO -

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

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

6. Disconnect the sunlight sensor 2P connector.

7. Disconnect the climate control unit 36P connector.

8. Check for continuity between body ground and climate control unit 36P connector terminal No. 9.





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 9.

9. Check for continuity between climate control unit 36P connector terminals No. 9 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 10.

10. Reconnect the sunlight sensor 2P connector.

11. Reconnect the climate control unit 36P connector.

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

Is the sunlight sensor OK?

YES -

Substitute a known-good climate control unit, 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.�