TR Sensor Open
DTC B1225 or TR sensor open is indicated: An Open in the In-car Temperature Sensor Circuit1. 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 No. 15 terminal and the in-car temperature sensor 4P connector No. 3 terminal.
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 No. 33 terminal and the in-car temperature sensor 4P connector No. 2 terminal.
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.