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DTC B1779: HFL Switch or Voice Control Switch (PICK-UP/HANG-UP Buttons) Circuit Open/Short to Power (with navigation)

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. 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), or press the engine start/stop button to select the OFF mode, 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), or press the engine start/stop button to select the OFF mode
  6. Do the HFL switch test (see HFL SWITCH TEST )

    Is the switch OK? 

    YES  -Go to step 7

    NO  -Replace the audio remote, HFL-navigation voice control switch (see STEERING WHEEL DISASSEMBLY/REASSEMBLY )

  7. Remove the center console panel (see CENTER CONSOLE PANEL REMOVAL/INSTALLATION )
  8. Disconnect the HandsFreeLink control unit 28P connector (see step  2 under HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION)
  9. Remove the audio remote, HFL-navigation voice control switch (see STEERING WHEEL DISASSEMBLY/REASSEMBLY ) and disconnect the 12P connector, then connect the cable reel 20P connector
  10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  11. Measure the voltage between audio remote, HFL-navigation voice control switch 12P connector terminal No 9 and body ground
    Fig 1: Measuring Voltage Between Audio Remote, HFL-Navigation Voice Control Switch 12P Connector Terminal No 9 And Body Ground
    G05989940Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    YES  -Go to step  15

    NO  -Go to step 12

  12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  13. Check for continuity between HandsFreeLink control unit 28P connector terminal No 2 and audio remote, HFL-navigation voice control switch 12P connector terminal No 9
    Fig 2: Checking Continuity Between Handsfreelink Control Unit 28P And Audio Remote, HFL-Navigation Voice Control Switch 12P Connector
    G05989941Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  18

    NO  -Repair open in the GRN wire between the switch, the cable reel, and the HandsFreeLink control unit

  14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
  15. Disconnect cable reel 20P connector
  16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
  17. Measure the voltage between HandsFreeLink control unit 28P connector terminal No 2 and body ground
    Fig 3: Measuring Voltage Between Handsfreelink Control Unit 28P Connector Terminal No 2 And Body Ground
    G05989942Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    YES  -Repair short to power in the wire between the HandsFreeLink control unit and the cable reel

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

  18. Disconnect audio-navigation unit connector A (24P)
  19. Check for continuity between audio remote, HFL-navigation voice control switch 12P connector terminal No 11 and audio-navigation unit connector A (24P) terminal No 5
    Fig 4: Checking Continuity Between Audio Remote, HFL-Navigation Voice Control Switch 12P And Audio-Navigation Unit Connector A (24P)
    G05989943Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the HandsFreeLink control unit (see HFL SWITCH TEST )

    NO  -Go to step 20

  20. Substitute a known-good cable reel (see CABLE REEL REPLACEMENT ), and check for continuity between audio remote, HFL-navigation voice control switch 12P connector terminal No 11 and audio-navigation unit connector A (24P) terminal No 5
    Fig 5: Checking Continuity Between Audio Remote, HFL-Navigation Voice Control Switch 12P And Audio-Navigation Unit Connector A (24P)
    G05989944Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the original cable reel

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

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