DTC Troubleshooting: B1225 (A)

DTC indicator A or DTC B1225: An Open in the In-car Temperature Sensor Circuit

1. Clear the DTC.

1. Turn the ignition switch OFF, and then ON (II).

1. Operate the climate control system is several modes.

1. Check the DTCs.

Is DTC A or B1225 indicated?

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

1. Remove the in-car temperature sensor, and test it.

Does the in-car temperature sensor test OK?

YES | - | Go to Step 6 .
NO | - | Replace the in-car temperature sensor .■

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

1. Check for continuity between the No. 11 terminal of climate control unit connector A (22P) and the No. 1 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

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

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

Is there continuity?

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