B1230

DTC B1230 or DTC indicator F: A Short in the Sunlight Sensor Circuit

1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF, 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 indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect climate control unit connector A (32P).




8. Check for continuity between body ground and climate control unit connector A (32P) terminal No. 24.

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 9.




9. Check for continuity between climate control unit connector A (32P) terminals No. 19 and No. 24.

Is there continuity?

YES - Repair 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 climate control unit connector A (32P).
12. Test the sunlight sensor. 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.

NO - Replace the sunlight sensor.