B1225

DTC B1225 or TR sensor open is indicated: An Open in the In-car Temperature Sensor Circuit

1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF and then ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.

Is DTC B1225 or TR sensor open indicated?

YES - Go to step 5.

NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.

5. Turn the ignition switch OFF.
6. Remove the in-car temperature sensor and test it.

Is the in-car temperature sensor OK?

YES - Go to step 7.

NO - Replace the in-car temperature sensor.

7. Disconnect the climate control unit 40P connector.




8. Check for continuity between the climate control unit 40P connector terminal No. 15 and the in-car temperature sensor 4P connector terminal No. 3.

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wire between the, climate control unit and the in-car temperature sensor.




9. Check for continuity between the climate control unit 40P connector terminal No. 33 and the in-car temperature sensor 4P connector terminal No. 2.

Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit 40P connector and at the in-car temperature sensor 4P 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.