B1232

DTC Troubleshooting: B1232 (H)

DTC B1232 or DTC indicator H:

A Short in the Evaporator Temperature Sensor Circuit

NOTE: If DTC B1232 is detected with HDS, it is not necessary to do step 1.

1. Check the sensor input display mode, and select "evaporator temperature" according to the table.

NOTE: This indication by segment lit on digital segments is assigned for 2 failure causes that it is necessary to decide which one is a true cause. If there is a failure in the sensor or motor, a value corresponded to the sensor or motor in the Sensor Input Display Mode is displayed as "Er", which serves to specify which is a true cause.

Is sensor value indicated "Er"?

YES -

Go to step 2

NO -

Go to troubleshooting DTC B1205 or DTC indicator H B1205

2. Clear the DTC with the HDS.

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

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

5. Check for DTCs.

Is DTC B1232 or H indicated?

YES -

Go to step 6.

NO -

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

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

7. Test the evaporator temperature sensor Evaporator Temperature Sensor Test.

Is the evaporator temperature sensor OK?

YES -

With the evaporator temperature sensor disconnected, go to step 8.

NO -

Replace the evaporator temperature sensor Service and Repair.�

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

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





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 10.

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





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.�