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DTC B1779: HandsFreeLink Steering Wheel Switch Failure

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION  ).
  2. Clear the DTCs with the HDS.
  3. Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
  4. Check for DTCs with the HDS.

    Is DTC B1779 indicated? 

    YES  -Go to Step 5.

    NO  -Intermittent failure, the system is OK at this time.

  5. Turn the ignition switch to LOCK (0).
  6. Do the HFL switch test (see HFL SWITCH TEST  ).

    Is the switch OK? 

    YES  -Go to Step 7.

    NO  -Replace the HFL-navigation voice control switch (see VOICE CONTROL SWITCH TEST ).

  7. Disconnect the HandsFreeLink control unit 28P connector.
  8. Disconnect the HFL-navigation voice control switch 5P connector, then connect the cable reel 20P connector.
  9. Turn the ignition switch to ON (II).
  10. Measure the voltage between HFL-navigation voice control switch 5P connector terminal No. 3 and body ground.
    Fig 1: Measuring Voltage Between HFL-Navigation Voice Control Switch 5P Connector Terminal No. 3 And Body Ground
    G06432026Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES  -Go to Step 11.

    NO  -Go to Step 15.

  11. Turn the ignition switch to LOCK(0).
  12. Substitute a known-good cable reel (see CABLE REEL REPLACEMENT ).
  13. Turn the ignition switch to ON (II).
  14. Measure the voltage between HFL-navigation voice control switch 5P connector terminal No. 3 and body ground.
    Fig 2: Measuring Voltage Between HFL-Navigation Voice Control Switch 5P Connector Terminal No. 3 And Body Ground
    G06432026Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES  -Repair a short to power in the wire between the HandsFreeLink control unit, the cable reel, and the HFL-navigation voice control switch.

    NO  -Replace the original cable reel (see CABLE REEL REPLACEMENT ).

  15. Turn the ignition switch to LOCK (0).
  16. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and HFL-navigation voice control switch 5P connector terminal No. 3.
    Fig 3: Checking Continuity Between HandsFreeLink Control Unit 28P Connector And HFL-Navigation Voice Control Switch 5P Connector
    G06432027Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to Step 18.

    NO  -Go to step 17.

  17. Substitute a known-good cable reel (see CABLE REEL REPLACEMENT ), and check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and HFL-navigation voice control switch 5P connector terminal No. 3.
    Fig 4: Checking Continuity Between HandsFreeLink Control Unit 28P Connector And HFL-Navigation Voice Control Switch 5P Connector
    G06432027Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the original cable reel (see CABLE REEL REPLACEMENT ).

    NO  -Repair an open in the wire between the HFL-navigation switch, the cable reel, and the HandsFreeLink control unit.

  18. Remove the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and disconnect audio-navigation unit connector A (24P).
  19. Check for continuity between HFL-navigation voice control switch 5P connector terminal No. 4 and audio-navigation unit connector A (24P) terminal No. 5.
    Fig 5: Checking Continuity Between HFL-Navigation Voice Control Switch 5P Connector And Audio-Navigation Unit Connector A (24P)
    G06432029Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the HandsFreeLink control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT  ).

    NO  -Go to Step 20.

  20. Substitute a known-good cable reel (see CABLE REEL REPLACEMENT ), and check for continuity between HFL-navigation voice control switch 5P connector terminal No. 4 and audio-navigation unit connector A (24P) terminal No. 5.
    Fig 6: Checking Continuity Between HFL-Navigation Voice Control Switch 5P Connector And Audio-Navigation Unit Connector A (24P)
    G06432030Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the original cable reel (see CABLE REEL REPLACEMENT ).

    NO  -Repair an open in the wire between the audio remote, the HFL voice control switch, and the audio-navigation unit.

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