DTC B1229 or DTC indicator E and AUTO

An Open in the Sunlight Sensor Circuit

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Do the Self-Diagnostic Function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS  ) or the climate control unit (see HOW TO USE THE CLIMATE CONTROL UNIT SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS  ).
4. 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.

5. Turn the ignition switch to LOCK (0).
6. Disconnect the sunlight sensor 5P connector.
7. Disconnect climate control unit connector B (16P).
8. Check for continuity between climate control unit connector B (16P) terminal No. 3 and sunlight sensor 5P connector terminal No. 2.
   Fig 1: Checking Continuity Between Climate Control Unit And Sunlight Sensor Connector Terminal

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity? 

   YES  -Go to step 9.

   NO  -Repair an open in the wire between the climate control unit and the sunlight sensor.

9. Disconnect climate control connector A (28P).
10. Check for continuity between climate control unit connector A (28P) terminal No. 13 and the sunlight sensor 5P connector terminal No. 4.
    Fig 2: Checking Continuity Between Climate Control Unit And Sunlight Sensor Connector Terminal

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 11.

    NO  -Repair an open in the wire between the climate control unit and the sunlight sensor.

11. Reconnect the sunlight sensor 5P connector.
12. Reconnect climate control unit connectors A (28P) and B (16P).
13. Test the sunlight sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST  ).

    Is the sunlight sensor OK? 

    YES  -Check for loose wires or poor connections at climate control unit connectors A (28P), B (16P) and at the sunlight sensor 5P 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 (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION  ).

    NO  -Replace the sunlight sensor (see SUNLIGHT SENSOR REPLACEMENT  ).