( TL19E00K733000Y1229FAAT00 )

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.■