H and Auto

DTC Troubleshooting: B1232 (H and AUTO)

DTC B1232 or DTC indicator H and AUTO:

A Short in the Front Evaporator Temperature Sensor Circuit

1. Clear the DTCs with the HDS.

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

3. Do the self-diagnostic function with the HDS or the climate control unit.

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 -

With the front evaporator temperature sensor disconnected, go to step 7.

NO -

Replace the front evaporator temperature sensor Front Evaporator Temperature Sensor Replacement.�

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 a 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 a 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 Climate Control Unit Removal/Installation.�