DTC Troubleshooting: B1229 (E)
DTC B1229 or DTC indicator E:
 An Open 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 B1229 or E indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.■
  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 the heater control unit 32P connector terminal No. 15 and the sunlight sensor 2P connector terminal No. 1.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the heater control unit and the sunlight sensor.■