H and AUTO

DTC Troubleshooting: B1232 or Indicator H and AUTO

DTC B1232 or DTC indicator H and AUTO:A Short in the 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 How to Troubleshoot the Climate Control System or climate control unit. How to Troubleshoot the Climate Control System

4. Check for DTCs.

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

NO - Intermittent failure. Check for loose wires or poor connections on the evaporator temperature sensor circuit.


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

6. Disconnect climate control unit connectors A (28P) and B (12P).

7. Check for continuity between climate control unit connector A (28P) No. 23 terminal and body ground.

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

NO - Go to step 8.






8. Check for continuity between climate control unit connector A (28P) No. 23 terminal and climate control unit connector B (12P) No. 10 terminal.

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

NO - Go to step 9.






9. Remove the evaporator temperature sensor, Service and Repair and test it. Evaporator Temperature Sensor Test

Is the evaporator temperature sensor OK?
YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit. Service and Repair

NO - Replace the evaporator temperature sensor.