DTC B20A0

DTC B20A0  : HSW Temperature Sensor Open/Short

DTC (Gauge Control Module)

NOTE: 

• SRS components are located in this area. Review the SRS component locations , and precautions and procedures before doing repairs or servicing.
• After testing, clear the SRS control unit DTCs.
• If DTC U0299 is indicated, troubleshoot the DTC first.

1. Problem verification

   -1. Clear the DTCs with the HDS.

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

   -3. Press the heated steering wheel button.

   -4. Wait for at least 8 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B20A0 HSW Temperature Sensor Open/Short

   Is DTC B20A0 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Determine possible failure area (heated steering wheel temperature sensor, others)

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

   -2. Do the battery terminal disconnection procedure .

   -3. Remove the steering wheel , and the steering wheel rear cover.

   -4. Install the steering wheel without the driver's airbag and the steering wheel rear cover.

   -5. Do the battery terminal reconnection procedure .

   -6. Turn the steering wheel at 180 deg..

   -7. Disconnect the following connector.

   Steering heater 4P connector

   -8. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode Heated steering wheel switch ON Steering heater 4P connector: disconnected
   Test circuit	NTC+
   Test point 1	Steering heater 4P connector No. 3 (WHT)
   Test point 2	Body ground

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

   Is there 0 V or 5 V ?

   0 V

   Go to step 5.

   5 V

   Go to step 3.

3. Open wire check (NTC+ line)

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

   Test condition	Vehicle ON mode Heated steering wheel switch ON Steering heater 4P connector: disconnected
   Test circuit	NTC+
   Test point 1	Heated steering wheel control unit 14P connector No. 6 (WHT)
   Test point 2	Body ground

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

   Is there 5 V?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   The NTC+ wire is not open. Go to step 4.

4. Shorted wire check (NTC+ line)

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

   -2. Disconnect the following connector.

   Heated steering wheel control unit 14P connector

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

   Test condition	Vehicle OFF (LOCK) mode Steering heater 4P connector: disconnected Heated steering wheel control unit 14P connector: disconnected
   Test circuit	NTC+
   Test point 1	Heated steering wheel control unit 14P connector No. 6 (WHT)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   Replace the heated steering wheel control unit .

5. Heated steering wheel temperature sensor check

   -1. Do the heated steering wheel temperature sensor check .

   Is the heated steering wheel temperature sensor OK?

   YES 

   Go to step 6.

   NO 

   Faulty steering wheel temperature sensor, replace the steering wheel assembly .

6. Open wire check (NTC- line)

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

   -2. Disconnect the following connector.

   Heated steering wheel control unit 14P connector

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

   Test condition	Vehicle OFF (LOCK) mode Steering heater 4P connector: disconnected Heated steering wheel control unit 14P connector: disconnected
   Test circuit	NTC-
   Test point 1	Steering heater 4P connector No. 4 (GRN)
   Test point 2	Heated steering wheel control unit 14P connector No. 7 (GRN)

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

   Is there continuity?

   YES 

   Replace the heated steering wheel control unit .

   NO 

   Repair an open or high resistance in the wire.