DTC Troubleshooting: B1229 (E and AUTO)
DTC B1229 or DTC indicator E and AUTO:
 An Open 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 B1229 or E and AUTO 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 to LOCK (0).
  1. Disconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).
  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 the sunlight sensor 2P connector No. 1 terminal.
Is there continuity?
YES -
Go to Step 9 .
NO -
Repair open in the wire between the heater control unit and the sunlight sensor.■