DTC Troubleshooting: B1226 (B)

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 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 indicated?


YES - Go to 5.


NO - Intermittent failure.n


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 7.


NO - Replace the  in-car temperature sensor.n


7.Disconnect the climate control unit 32P connector.

8.Check for continuity between body ground and the climate control unit 32P connector terminals No. 19 and No. 26 individually.

 

Is there continuity?


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


NO - Go to 9.


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

 

Is there continuity?


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


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