DTC B1226 or DTC indicator B and AUTO: A Short in the In-car Temperature Sensor Circuit
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
- Clear the DTC with the HDS.
- Turn the ignition switch to LOCK (0) and then 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.
- 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 HUMIDITY SENSOR TEST
).
Is the in-car temperature sensor OK?
YES -Go to step 7.
NO -Replace the humidity/in-car temperature sensor.
- Disconnect the climate control unit 36P connector.
- Check for continuity between body ground and climate control unit 36P connector terminals No. 1 and No. 20 individually.Fig 1: Checking Continuity Between Body Ground And Climate Control Unit 36P Connector Terminals No. 1 And No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to body ground in the wires between the climate control unit and the in-car temperature sensor.
NO -Go to step 9.
- Check for continuity between climate control unit 36P connector terminals No. 1 and No. 20.
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.