( TL19E00K711000Y1231FAAT00 )

DTC Troubleshooting: B1231 (G and AUTO)

1. Check for continuity between climate control unit connector B (12P) No. 10 terminal and the evaporator temperature sensor 2P connector No. 1 terminal.

Is there continuity?

YES | - | Go to Step 9 .
NO | - | Repair open in the wire between the climate control unit and the evaporator temperature sensor.■

1. Remove the evaporator temperature sensor, and test it.

Is the evaporator temperature sensor OK?

YES | - | Check for loose wires or poor connections at climate control unit connectors A (28P), B (12P), and at the evaporator temperature sensor 2P connector. If the connections are good, 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 .■