( TF09E8HK711000Y1229FAAT00 )
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. 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 connector.
  1. Disconnect the climate control unit 36P connector.
  1. Check for continuity between the climate control unit 36P connector No. 19 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 climate control unit and the sunlight sensor.■
  1. Check for continuity between the climate control unit 36P connector No. 1 terminal and the sunlight sensor 2P connector No. 2 terminal.
Is there continuity?
YES -
Go to Step 10 .
NO -
Repair open in the wire between the climate control unit and the sunlight sensor.■
  1. Reconnect the sunlight sensor connector.
  1. Reconnect the climate control unit 36P connector.
Is the sunlight sensor OK?
YES -
Check for loose wires or poor connections at the climate control unit 36P connector and at the sunlight sensor connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■
NO -