DTC B20A3

DTC B20A3  : HSW Drive Circuit Failure

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 5 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B20A3 HSW Drive Circuit Failure

   Is DTC B20A3 indicated?

   YES 

   Go to step 2.

   NO 

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

2. Heated steering wheel control unit HSW SWITCH line output check

   -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 vehicle to the ON mode.

   -7. Turn the steering wheel at 180 deg..

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

   Test condition	Vehicle ON mode Heated steering wheel switch OFF to ON
   Test circuit	HSW SWITCH
   Test point 1	Heated steering wheel control unit 14P connector No. 5 (LT BLU)
   Test point 2	Body ground

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

   Is there a change in voltage 0 V to 12 V?

   YES 

   Replace the heated steering wheel control unit .

   NO 

   Go to step 3.

   NO 

   Go to step 6.

3. Heated steering wheel control unit HSW SW +B line output check

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

   Test condition	Vehicle ON mode Heated steering wheel switch ON
   Test circuit	HSW SW +B
   Test point 1	Heated steering wheel control unit 14P connector No. 14 (PNK)
   Test point 2	Body ground

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

   Is there 12 V?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Open wire check (HSW SWITCH, HSW SW +B lines)

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

   -2. Disconnect the following connectors.

   Heated steering wheel switch 5P connector

   Heated steering wheel control unit 14P connector

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

   Test condition	Vehicle OFF (LOCK) mode Heated steering wheel switch 5P connector: disconnected Heated steering wheel control unit 14P connector: disconnected
   Test circuit	HSW SWITCH
   Test point 1	Heated steering wheel switch 5P connector No. 3 (LT BLU)
   Test point 2	Heated steering wheel control unit 14P connector No. 5 (LT BLU)

   Test circuit	HSW SW +B
   Test point 1	Heated steering wheel switch 5P connector No. 4 (PNK)
   Test point 2	Heated steering wheel control unit 14P connector No. 14 (PNK)

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

   Is there continuity?

   YES 

   The HSW SWITCH, HSW SW +B wires are OK. Go to step 7.

   NO 

   Repair an open or high resistance in the wire.

5. Shorted wire check (HSW SWITCH, HSW SW +B lines)

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

   -2. Disconnect the following connectors.

   Heated steering wheel switch 5P connector

   Heated steering wheel control unit 14P connector

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

   Test condition	Vehicle OFF (LOCK) mode Heated steering wheel switch 5P connector: disconnected Heated steering wheel control unit 14P connector: disconnected
   Test circuit	HSW SWITCH
   Test point 1	Heated steering wheel control unit 14P connector No. 5 (LT BLU)
   Test point 2	Body ground

   Test circuit	HSW SW +B
   Test point 1	Heated steering wheel control unit 14P connector No. 14 (PNK)
   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 .

6. Shorted wire check (HSW SWITCH line to power)

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

   -2. Disconnect the following connectors.

   Heated steering wheel switch 5P connector

   Heated steering wheel control unit 14P connector

   -3. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode Heated steering wheel switch 5P connector: disconnected Heated steering wheel control unit 14P connector: disconnected
   Test circuit	HSW SWITCH
   Test point 1	Heated steering wheel switch 5P connector No. 3 (LT BLU)
   Test point 2	Heated steering wheel control unit 14P connector No. 5 (LT BLU)

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

   Is there battery voltage?

   YES 

   Repair a short to power in the HSW SWITCH wire.

   NO 

   The HSW SWITCH wire is OK. Go to step 7.

7. Heated steering wheel switch check

   -1. Do the heated steering wheel switch test .

   Is the heated steering wheel switch OK?

   YES 

   Replace the heated steering wheel control unit .

   NO 

   Replace the heated steering wheel switch .