DTC Troubleshooting: B1230 (F)
DTC B1230 or DTC indicator F:
 A Short in the Sunlight Sensor Circuit
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch OFF and then ON (II).
  1. Do the self-diagnostic with the HDS or heater control unit.
  1. Check for DTCs.
Is DTC B1230 or F indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure.■
  1. Turn the ignition switch OFF.
  1. Disconnect the sunlight sensor 2P connector.
  1. Disconnect the heater control unit 32P connector.
  1. Check for continuity between body ground and the heater control unit 32P connector terminal No. 15.
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 .