With Climate Control

DTC Troubleshooting: B1232 (H)

DTC B1232 or DTC indicator H:

A Short in the Evaporator Temperature Sensor Circuit

1. Clear the DTC with the HDS.

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS or the self-diagnostic function.

Is DTC B1232 or H indicated?

YES -

Go to step 4.

NO -

Intermittent failure. Check for loose wires or poor connections on the evaporator temperature sensor circuit.�

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

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

Is the evaporator temperature sensor OK?

YES -

With the evaporator temperature sensor disconnected, go to step 6.

NO -

Replace the evaporator temperature sensor Service and Repair.�

6. Disconnect the climate control unit 30P connector.

7. Check for continuity between body ground and climate control unit 30P connector terminal No. 7.





Is there continuity?

YES -

Repair a 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 30P connector terminals No. 7 and No. 22.





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 Climate Control Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original climate control unit Climate Control Unit Removal/Installation.�