DTC Troubleshooting: B1232 (H and AUTO)
DTC B1232 or DTC indicator H and AUTO:
 A Short in the Evaporator Temperature Sensor Circuit
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0), and then ON (II).
  1. Check for DTCs.
Is DTC B1232 or H and AUTO indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect climate control unit connectors A (28P) and B (12P).
  1. 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 .
  1. 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 .
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 -