DTC B2968 or DTC indicator K and AUTO: A Short in the Humidity 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 B2968 or K and AUTO indicated?
YES -Go to step 5.
NO -Intermittent failure, check for loose wires or poor connections in the humidity sensor circuit.
- Turn the ignition switch to LOCK (0).
- Disconnect the climate control unit 36P connector.
- Disconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.
- Check for continuity between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually.Fig 1: Checking Continuity Between Body Ground And Climate Control Unit 36P Connector Terminals No. 1, 3 And 24
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 humidity sensor.
NO -Go to step 9.
- Check for continuity between terminals of the climate control unit 36P connector as follows.
From terminal To terminals 1 3, 24 3 24 Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity between any of the terminals?
YES -Repair a short in the wires.
NO -Go to step 10.
- Turn the ignition switch to ON (II).
- Measure the voltage between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually.Fig 3: Measuring Voltage Between Body Ground And Climate Control Unit 36P Connector Terminals No. 1, 3 And 24
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there any voltage?
YES -Repair a short to power in the wires between the climate control unit and the humidity sensor. This short may also damage the climate control unit. Repair a short to power before replacing the climate control unit.
NO -Go to step 12.
- Reconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.
- Reconnect the climate control unit 36P connector.
- Test the humidity sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST ).
Is the humidity temperature sensor OK?
YES -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 -Replace the humidity/in-car temperature sensor (see HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT ).