DTC B2968 or DTC indicator K and AUTO: A Short in the Humidity Sensor Circuit

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 B2968 or K and AUTO indicated?

YES -Go to step 5.

NO -Intermittent failure. Check for loose wires or poor connections on 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. 12, 19, and No. 35 individually.

Fig 1: Checking Continuity Between Body Ground And Climate Control Unit 36P Connector Terminals No. 12, 19, And No. 35
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the wire(s) 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.

36P CONNECTOR TERMINALS REFERENCE

From terminal	To terminals
12	19, 35
19	35

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), and check the same terminals for voltage to body ground.

Fig 2: Checking Voltage Between Body Ground And Climate Control Unit 36P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there any voltage?

YES -Repair a short to power in the wire(s) between the climate control unit and the humidity sensor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.

NO -Go to step 11.
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 ).