B1229

DTC B1229 or DTC indicator E and AUTO: An Open in the Sunlight Sensor Circuit

1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
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. Test the sunlight sensor.

Is the sunlight sensor OK?

YES - Go to step 7.

NO - Replace the sunlight sensor.

7. Disconnect the sunlight sensor 2P connector.
8. Disconnect the climate control unit connector B (16P).
9. Check for continuity between the climate control unit connector B (16P) No. 13 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.

10. Check for continuity between the climate control unit connector B (16P) No. 4 terminal and the sunlight sensor 2P connector No. 1 terminal.






Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit connector B (16P) and at the sunlight sensor 2P 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 - Repair open in the wire between the climate control unit and the sunlight sensor.