DTC Troubleshooting: B

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

1.Clear the DTC by turning the ignition switch OFF, and then ON (II).

2.Operate the climate control system in several modes.

3.Check for DTCs using the self-diagnostic.

Is DTC B indicated?


YES - Go to 4.


NO - Intermittent failure.n


4.Turn the ignition switch OFF.

5.Remove the in-car temperature sensor and test it.

Does the in-car temperature sensor test OK?


YES - Go to 6.


NO - Replace the  in-car temperature sensor.n


6.Disconnect climate control unit 28P connector.

7.Check for continuity between the No. 28 terminal of climate control unit 28P connector and body ground.

 

Is there continuity?


YES - Go to 8.


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


8.Check for continuity between the No. 28 terminal and the No. 18 terminal of climate control unit 28P connector.

 

Is there continuity?


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


NO - Repair short to body ground in the wire between the climate control unit and the in-car temperature sensor.n