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 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 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 HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST ).
Is the in-car temperature sensor OK?
YES -With the 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 the climate control unit 36P connector.
- Check for continuity between climate control unit 36P connector terminal No. 20 and humidity/in-car temperature sensor 4P connector terminal No. 1.Fig 1: Checking Continuity Between Climate Control Unit 36P Connector Terminal No. 20 And Humidity/In-Car Temperature Sensor 4P Connector Terminal No. 1
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.
- Check for continuity between climate control unit 36P connector terminal No. 1 and humidity/in-car temperature sensor 4P connector terminal No. 2.Fig 2: Checking Continuity Between Climate Control Unit 36P Connector Terminal No. 1 And Humidity/In-Car Temperature Sensor 4P Connector Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose wires or poor connections at the climate control unit 36P connector 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.