DTC B2968 (P and AUTO)

DTC B2968 or DTC indicator P and AUTO  : A short in the humidity sensor circuit

NOTE:  If other short circuit DTCs are indicated at the same time, there may be an open or short to body ground in the power (5 V) circuit.

DTCs (AC)

1. Problem verification

   -1. Clear the DTC with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

   -3. Do the Self-Diagnostic Function with the HDS or the climate control unit .

   -4. Check for DTCs.

   DTC Description	DTC
   B2968 A short in the humidity sensor circuit

   Is DTC B2968 or P and AUTO indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure. Check for loose wires or poor connections on the humidity sensor circuit.

2. Determine possible failure area (SENSOR 5V line, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Humidity/in-car temperature sensor 4P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Humidity/in-car temperature sensor 4P connector: disconnected
   Test point 1	Humidity/in-car temperature sensor 4P connector (female terminals) No. 4:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V?

   YES 

   The SENSOR 5V wire is not open. Go to step 3.

   NO 

   Go to step  6.

3. Shorted wire check (HUMID SENS line to SENSOR(COM) line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Climate control unit connector A (32P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Humidity/in-car temperature sensor 4P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 18
   Test point 2	Climate control unit connector A (32P) No. 21

   Is there continuity?

   YES 

   Repair a short in the wires between the climate control unit and the humidity/in-car temperature sensor.

   NO 

   The HUMID SENS wire to SENSOR(COM) wire is not shorted. Go to step 4.

4. Shorted wire check (HUMID SENS line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Humidity/in-car temperature sensor 4P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 21
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire between the climate control unit and the humidity/in-car temperature sensor.

   NO 

   The HUMID SENS wire is not shorted. Go to step 5.

5. Humidity sensor check

   -1. Test the humidity sensor .

   Is the humidity sensor OK?

   YES 

   Replace the climate control unit .

   NO 

   Replace the humidity/in-car temperature sensor .

6. Open wire check (SENSOR 5V line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Climate control unit connector A (32P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Climate control unit connector A (32P): disconnected
   	Humidity/in-car temperature sensor 4P connector: disconnected
   Test point 1	Climate control unit connector A (32P) No. 5
   Test point 2	Humidity/in-car temperature sensor 4P connector (female terminals) No. 4:

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SENSOR(COM) wire is not open. Replace the climate control unit .

   NO 

   Repair an open in the wire between the climate control unit and the humidity/in-car temperature sensor.