B1232

DTC Troubleshooting: B1232 (H and AUTO)

DTC B1232 or DTC indicator H and AUTO:

A Short in the 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, check for loose wires or poor connection in the evaporator temperature sensor circuit.

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

6. Remove the evaporator temperature sensor Service and Repair, and test it Testing and Inspection.

Is the evaporator temperature sensor OK?

YES -

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

NO -

Replace the evaporator temperature sensor Service and Repair.

7. Disconnect the climate control unit 36P connector.

8. Check for continuity between climate control unit 36P connector terminal No. 23 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wires between the climate control unit and the evaporator temperature sensor.

NO -

Go to step 9.

9. Check for continuity between climate control unit 36P connector terminals No. 1 and No. 23.





Is there continuity?

YES -

Repair a 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 Climate Control Unit Removal/Installation.