DTC B1228 or DTC indicator D and AUTO: A Short in the Outside Air Temperature Sensor Circuit
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Do the self-diagnostic function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
- Check for DTCs.
Is DTC B1228 or D and AUTO indicated?
YES -Go to step 5.
NO -Intermittent failure.
- Turn the ignition switch to LOCK (0).
- Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT
), and test it (see OUTSIDE AIR TEMPERATURE SENSOR TEST
).
Is the outside air temperature sensor OK?
YES -With the outside air temperature sensor disconnected, go to step 7.
NO -Replace the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT ).
- Disconnect climate control unit connector A (40P).
- Check for continuity between climate control unit connector A (40P) terminal No. 28 and body ground.Fig 1: Checking For Continuity Between Climate Control Unit Connector A (40P) Terminal No. 28 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to body ground in the wire between the climate control unit and the outside air temperature sensor.
NO -Go to step 9.
- Check for continuity between climate control unit connector A (40P) terminals No. 8 and No. 28.Fig 2: Checking For Continuity Between Climate Control Unit Connector A (40P) Terminals No. 8 And No. 28
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a 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 (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).