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 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. Test the evaporator temperature sensor. Evaporator Temperature Sensor Test

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

NO - Replace the evaporator temperature sensor.


7. Disconnect climate control unit connector A (24P).

8. Check for continuity between body ground and the climate control unit connector A (24P) No. 13 terminal.

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 9.






9. Check for continuity between the climate control unit connector A (24P) No. 13 and No. 18 terminals.

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