B1226

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

1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn to ON (II).
3. Do the self-diagnostic with the HDS or climate control unit.
4. Check for DTCs.

Is DTC B1226 or B indicated?

YES - Go to step 5.

NO - Intermittent failure.

5. Turn the ignition switch to LOCK (0).
6. Remove the humidity/in-car temperature sensor, and test it.

Is the in-car temperature sensor OK?

YES - Go to step 7.

NO - Replace the humidity/in-car temperature sensor.

7. Disconnect climate control unit connector A (32P).
8. Check for continuity between body ground and climate control unit connector A (32P) No. 26 terminal.






Is there continuity?

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

NO - Go to step 9.

9. Check for continuity between climate control unit connector A (32P) No. 19 and No. 26 terminals.






Is there continuity?

YES - Repair short in the wires between the climate control unit and the humidity/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.