B1228

DTC B1228 or TAM senior short is indicated.:
A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC with the HDS.
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1228 or TAM sensor short indicated?

YES - Go to step 4.

NO- Intermittent failure.

4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor and test it.

Is the outside air temperature sensor OK?

YES - Go to step 6.

NO- Replace the outside air temperature sensor.

6. Disconnect the climate control unit 40P connector.




7. Check for continuity between the No. 16 terminal of the climate control unit 40P connector and body ground.

Is there continuity?

YES - Repair short to body ground in the wire between the climate control unit and the outside air temperature sensor.

NO- Go to step 8.




8. Check for continuity between the No. 16terminal and the No. 33 terminal of the climate control unit 40P connector.

Is there continuity?

YES - Repair short in the wires between the climate control unit and the outside air temperature sensor.

NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.