DTC D

DTC B1249 or DTC indicator D: An Open in the Rear In-car Temperature Sensor Circuit (with Rear Climate Control)

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).
2. Operate the rear climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1249 or D indicated?

YES - Go to step 4.

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

4. Turn the ignition switch to LOCK (0).
5. Remove the rear in-car temperature sensor and test it.

Does the rear in-car temperature sensor test OK?

YES - Go to step 6.

NO - Replace the rear in-car temperature sensor.

6. Disconnect the rear climate control unit 22P connector.
7. Check for continuity between the No. 11 terminal of the rear climate control unit 22P connector and the No. 2 terminal of the rear in-car temperature sensor 2P connector.






Is there continuity?

YES - Go to step 8.

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

8. Check for continuity between the No. 21 terminal of the rear climate control unit 22P connector and the No. 1 terminal of the rear in-car temperature sensor 2P connector.






Is there continuity?

YES - Check for loose wires or poor connections at the rear climate control unit 22P connector and at the rear in-car temperature sensor 2P connector. If the connections are good, substitute a known-good rear climate control unit, and recheck. If the symptom/indication goes away, replace the original rear climate control unit.

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