B1232

DTC indicator H or DTC B1232: A Short in the Evaporator Temperature Sensor Circuit

1. Clear the OTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS.

Is DTC H or B1232 indicated?

YES - Go to step 4.

NO - Intermittent failure.

4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor and test it.

Does the evaporator temperature sensor test OK?

YES - Go to step 6.

NO - Replace the evaporator temperature sensor.

6. Disconnect climate control unit connector A (20P).




7. Check for continuity between the No.18 terminal of climate control unit connector A (20P) and body ground.

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 8.




8. Check for continuity between the No.18 terminal and the No.5 terminal of climate control connector (20P).

Is there continuity?

YES - Repair short to 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.