B1230

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 ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.

Is DTC B1230 or F and AUTO indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch to LOCK (0).
6. Test the sunlight sensor.

Is the sunlight sensor OK?

YES - Go to step 7.

NO - Replace the sunlight sensor.

7. Disconnect the sunlight sensor 2P connector.
8. Disconnect the climate control unit connector B (16P).
9. Check for continuity between body ground and the climate control unit connector B (16P) No. 13 terminal.






Is there continuity?

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

NO - Go to step 10.

10. Check for continuity between the climate control unit connector B (16P) No. 4 and No. 13 terminals.






Is there continuity?

YES - Repair short in the wires between the climate control unit and the sunlight sensor.

NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.