B1232
DTC B1232 or DTC indicator H: A Short in the Evaporator Temperature Sensor Circuit1. Clear the DTC by turning the ignition switch to LOCK (0), and then to ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the self-diagnostic or HDS.
Is DTC B1232 or H indicated?
YES - Go to step 4.
NO - Intermittent failure.
4. Turn the ignition switch to LOCK (0).
5. Remove the evaporator temperature sensor and test it.
Is the evaporator temperature sensor 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. 5 terminal and the No. 18 terminal of climate control unit connector A (20P).
Is there continuity?
YES - Repair 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.