DTC A
DTC B1225 or DTC indicator A: An Open in the In-car Temperature Sensor Circuit1. Clear the DTC with the HDS.
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DTC B1225 or A indicated?
YES - Go to step 4.
NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor and test it.
Is the in-car temperature sensor OK?
YES - Go to step 6.
NO - Replace the in-car temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the climate control unit 30P connector No. 8 terminal and the in-car temperature sensor 2P connector No. 1 terminal.
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.
8. Check for continuity between the climate control unit 30P connector No. 22 terminal and the in-car temperature sensor 2P connector No. 2 terminal.
Is there continuity?
YES - Check for loose wires or poor connections at the climate control unit 30P connector 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.