DTC B1226 or DTC indicator B and AUTO: A Short in the In-Car 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 B1226 or B and AUTO Indicated?
YES -Go to step 5.
NO -Intermittent failure, check for loose wires or poor connections in the in-car temperature sensor circuit.
- Turn the ignition switch to LOCK (0).
- Remove the humidity/in-car temperature sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT
), and test it (see IN-CAR TEMPERATURE SENSOR TEST
).
Is the in-car temperature sensor OK?
YES -With the humidity/in-car temperature sensor disconnected, go to step 7.
NO -Replace the humidity/in-car temperature sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT ).
- Disconnect climate control unit connector A (40P).
- Check for continuity between climate control unit connector A (40P) terminal No. 5 and body ground.Fig 1: Checking For Continuity Between Climate Control Unit Connector A (40P) Terminal No. 5 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 in-car temperature sensor.
NO -Go to step 9.
- Check for continuity between climate control unit connector A (40P) terminals No. 5 and No. 8.Fig 2: Checking For Continuity Between Climate Control Unit Connector A (40P) Terminals No. 5 And No. 8
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the wires between the climate control unit and the in-car 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 ).