DTC A and AUTO
DTC B1225 or DTC indicator A and AUTO: An Open in the In-car Temperature Sensor Circuit1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0) and then to ON (II).
3. Do the self-diagnostic function with the HDS or climate control unit.
4. Check for DTCs.
Is DTC B1225 or A and AUTO 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 to LOCK (0).
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 climate control unit connectors A (28P) and B (12P).
8. Check for continuity between climate control unit connector A (28P) No. 26 terminal and the in-car temperature sensor 2P connector No. 1 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 climate control unit connector B (12P) No. 10 terminal and the in-car temperature sensor 2P connector No. 2 terminal.
Is there continuity?
YES - Check for loose wires or poor connections at climate control unit connectors A (28P), B (12P), 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.