DTC Troubleshooting: B1228 (D)

DTC indicator D or DTC B1228: A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC.

1. Turn the ignition switch OFF, and then ON.

1. Operate the climate control system is several modes.

1. Check the DTCs.

Is DTC D or B1228 indicated?

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

1. Remove the outside air temperature sensor and test it.

Does the outside air temperature sensor test OK?

YES | - | Go to Step 6 .
NO | - | Replace the outside air temperature sensor .■

1. Disconnect climate control unit connector A (22P).

1. Check for continuity between the No. 12 terminal of climate control unit connector A (22P) 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 | - | Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■