B1226

DTC B1226 or DTC indicator B and AUTO: A Short in the In-car Temperature Sensor Circuit

1. 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 B1226 or B and AUTO indicated?

YES - Go to step 5.

NO - Intermittent failure.

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 connector B (16P).




8. Check for continuity between body ground and the climate control unit connector B (16P) terminal No. 14.

Is there continuity?

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

NO - Go to step 9.




9. Check for continuity between the climate control unit connector B (16P) terminals No. 4 and No. 14.

Is there continuity?

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

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