DTC B1779: HandsFreeLink Steering Wheel Switch Failure

NOTE: 

• Check the vehicle 12 volt battery condition first .
• Before you troubleshoot, make sure to follow the General Troubleshooting Information .
• Check the connectors for poor connections or loose terminals.

• 1. Problem verification:

  1. Start the engine, and turn the steering wheel left and right several times.

  2. Check for HFL DTCs .

  Is DTC B1779 indicated?

  YES 

  The failure is duplicated, go to step 2.

  NO 

  Intermittent failure, the system is OK at this time.

• 2. Determine possible failure area (HFL switch, others):

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

  2. Do the HFL Switch Test .

  Is the switch OK?

  YES 

  Go to step 3.

  NO 

  Replace the HFL switch .

• 3. Shorted wire check (HFT/NAVI REMOTE SW line to power):

  1. Disconnect the following connector.

  HandsFreeLink control unit 32P connector

  2. Reconnect cable reel connector C (20P).

  3. Turn the vehicle to the ON mode.

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

  Test condition	Vehicle ON mode
  	HandsFreeLink control unit 32P connector: disconnected
  	HFL switch 7P connector: disconnected
  Test point 1	HandsFreeLink control unit 32P connector No. 15
  Test point 2	Body ground

  Is there any voltage?

  YES 

  Repair a short to power in the wire between the HandsFreeLink control unit and the HFL switch. If the wire is OK, replace the cable reel .

  NO 

  The HFT/NAVI REMOTE SW wire is not shorted to power. Go to step 4.

• 4. Open wire check (HFT/NAVI REMOTE SW line):

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

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

  Test condition	Vehicle OFF (LOCK) mode
  	HandsFreeLink control unit 32P connector: disconnected
  	HFL switch 7P connector: disconnected
  Test point 1	HandsFreeLink control unit 32P connector No. 15
  Test point 2	HFL switch 7P connector No. 3

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

  Is there continuity?

  YES 

  The HFT/NAVI REMOTE SW wire is OK. Go to step 5.

  NO 

  Repair an open in the wire between the HandsFreeLink control unit and the HFL switch. If the wire is OK, replace the cable reel .

• 5. Open wire check (GND line):

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

  Test condition	Vehicle OFF (LOCK) mode
  	HandsFreeLink control unit 32P connector: disconnected
  	HFL switch 7P connector: disconnected
  Test point 1	HFL switch 7P connector No. 5
  Test point 2	Body ground

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

  Is there continuity?

  YES 

  Replace the HandsFreeLink control unit .

  NO 

  Repair an open in the wire between the HFL switch and body ground (T6).