DTC H and AUTO
DTC B1232 or DTC indicator H and AUTO: A Short in the Evaporator Temperature Sensor Circuit1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0) and then to ON (II).
3. Do the self-diagnostic function with the HDS or climate control unit.
4. Check for DTCs.
Is DTC B1232 or H and AUTO indicated?
YES - Go to step 5.
NO - Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Disconnect climate control unit connectors A (28P) and B (12P).
7. Check for continuity between climate control unit connector A (28P) No. 23 terminal 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 climate control unit connector A (28P) No. 23 terminal and climate control unit connector B (12P) No. 10 terminal.
Is there continuity?
YES - Repair short in the wires between the climate control unit and the evaporator temperature sensor.
NO - Go to step 9.
9. Remove the evaporator temperature sensor, and test it.
Is the evaporator temperature sensor OK?
YES - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.
NO - Replace the evaporator temperature sensor.