H and Auto

DTC Troubleshooting: B1232 or Indicator H and AUTO

DTC B1232 or DTC indicator H and AUTO:A Short in the Front Evaporator Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then to ON (II).

3. Do the self-diagnostic function with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B1232 or H and AUTO indicated?
YES - Go to step 5.

NO - Intermittent failure.


5. Turn the ignition switch to LOCK (0).

6. Remove the front evaporator temperature sensor, Front Evaporator Temperature Sensor Replacement and test it. Testing and Inspection

Is the front evaporator temperature sensor OK?
YES - Go to step 7.

NO - Replace the front evaporator temperature sensor.


7. Disconnect climate control unit connector A (40P).

8. Check for continuity between climate control unit connector A (40P) terminal No. 24 and body ground.

Is there continuity?
YES - Repair short to body ground in the wire between the climate control unit and the front evaporator temperature sensor.

NO - Go to step 9.






9. Check for continuity between climate control unit connector A (40P) terminals No. 8 and No. 24.

Is there continuity?
YES - Repair short in the wires between the climate control unit and the front evaporator temperature sensor.

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