DTC B1225 or DTC indicator A and AUTO: An Open 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 CLIMATE CONTROL UNIT SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
- Check for DTCs.
Is DTC B1225 or A and AUTO indicated?
YES -Go to step 5.
NO -Intermittent failure. Check for loose wires or poor connections on 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 HUMIDITY/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 B (16P).
- Check for continuity between climate control unit connector B (16P) terminal No. 1 and humidity/in-car temperature sensor 4P connector terminal No. 1.Fig 1: Checking Continuity Between Climate Control Unit And Humidity/In-Car Temperature Sensor Connector Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 9.
NO -Repair an open in the wire between the climate control unit and the in-car temperature sensor.
- Disconnect climate control unit connector A (28P).
- Check for continuity between climate control unit connector A (28P) terminal No. 13 and humidity/in-car temperature sensor 4P connector terminal No. 2.Fig 2: Checking Continuity Between Climate Control Unit And Humidity/In-Car Temperature Sensor Connector Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose wires or poor connections at climate control unit connector A (28P) and at the humidity/in-car temperature sensor 4P connector. If the connections are good, 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 ).
NO -Repair an open in the wire between the climate control unit and the in-car temperature sensor.