DTC Troubleshooting: B1229 (E)

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

1. Clear the DTC.

1. Turn the ignition switch OFF, and then ON.

1. Operate the climate control system is several modes.

1. Check the DTCs.

Is DTC E or B1229 indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.■

1. Disconnect the sunlight sensor 2P connector.

1. Disconnect climate control unit connector A (22P).

1. Check for continuity between the No. 13 terminal of climate control unit connector A (22P) and the No. 2 terminal of the sunlight sensor 2P connector.

Is there continuity?

YES | - | Go to Step 8 .
NO | - | Repair open in the wire between the climate control unit and the sunlight sensor.■

1. Check for continuity between the No. 15 terminal of climate control unit connector A (22P) and the No. 1 terminal of the sunlight sensor 2P connector.

Is there continuity?

YES | - | Go to Step 9 .
NO | - | Repair open in the wire between the climate control unit and the sunlight sensor.■

1. Reconnect the sunlight sensor 2P connector.

1. Reconnect climate control unit connector A (22P).

1. Test the sunlight sensor.

Is the sunlight sensor OK?

YES | - | Check for loose wires or poor connections at climate control unit connector A (22P) 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 | - | Replace the sunlight sensor .■