( TL19E00K733000Y1226FAAT00 )

DTC Troubleshooting: B1226 (B and AUTO)

DTC B1226 or DTC indicator B and AUTO:
A Short in the In-car Temperature Sensor Circuit

1. Clear the DTC with the HDS.

1. Turn the ignition switch to LOCK (0) and then to ON (II).

1. Do the self-diagnostic function with the HDS or the heater control unit.

1. Check for DTCs.

Is DTC B1226 or B and AUTO indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure.■

1. Turn the ignition switch to LOCK (0).

1. Remove the in-car temperature sensor , and test it.

Is the in-car temperature sensor OK?

YES | - | Go to Step 7 .
NO | - | Replace the in-car temperature sensor .■

1. Disconnect heater control unit connectors A (28P) and B (12P).

1. Check for continuity between heater control unit connector A (28P) No. 26 terminal and body ground.

Is there continuity?

YES | - | Repair short to body ground in the wire between the heater control unit and the in-car temperature sensor.■
NO | - | Go to Step 9 .