( TL19E00K733000Y1230FAAT00 )

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.

1. Turn the ignition switch to LOCK (0) and then to ON (II).

1. Do the self-diagnostic function with the HDS or the heater control unit.

1. Check for DTCs.

Is DTC B1230 or F and AUTO indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure.■

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

1. Disconnect the sunlight sensor 2P connector.

1. Disconnect heater control unit connectors A (28P) and B (12P).

1. Check for continuity between heater control unit connector A (28P) No. 25 terminal and body ground.

Is there continuity?

YES | - | Repair short to body ground in the wire between the heater control unit and the sunlight sensor.■
NO | - | Go to Step 9 .