B1224

DTC B1224 or DTC indicator E: A Short in the Rear In-car Temperature Sensor Circuit (with Rear Climate Control)

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

Is DTC B1224 or E indicated?

YES - Go to step 4.

NO - Intermittent failure.

4. Turn the ignition switch OFF.
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 body ground.

Is there continuity?

YES - Repair short to body ground in the wire between the rear climate control unit and the rear in-car temperature sensor.

NO - Go to step 8.




8. Check for continuity between the No. 11 terminal and the No. 21 terminal of the rear climate control unit 22P connector.

Is there continuity?

YES - Repair short in the wires between the rear climate control unit and the rear in-car temperature sensor.

NO - Substitute a known-good rear climate control unit, and recheck. If the symptom/indication goes away, replace the original rear climate control unit.