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HOMESERVICE MANUALSHONDA2009ODYSSEY EX-LREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSHANDSFREELINK SYSTEMDTC TROUBLESHOOTINGDTC B1780: HFL SWITCH (HFL TALK/HFL BACK BUTTONS) CIRCUIT SHORT
2009 Honda Odyssey EX-L

DTC B1780: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Short

2009 Honda Odyssey EX-LSECTION DTC B1780: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Short
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 (seeHow to Check for DTCs with the HDS )
  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 B1780 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/voice control switch (see VOICE CONTROL SWITCH REMOVAL/INSTALLATION ).

  7. Disconnect the HandsFreeLink control unit 28P connector.
  8. Disconnect the HFL/voice control switch 5P connector.
  9. Check for continuity between the HandsFreeLink control unit 28P connector terminal No. 2 and body ground.
    Fig 1: Identifying For Continuity Between Handsfreelink Control Unit 28P Connector Terminal No. 2 And Body Ground
    G05527678Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to body ground in the wire between the HandsFreeLink control unit and HFL/ voice control switch.

    NO  - Check for loose or poor connections at the audio unit, HandsFreeLink control unit, and HFL/ voice control switch. If the connections are OK, substitute a known-good HandsFreeLink control unit. If the problem is gone, replace the original HandsFreeLink control unit.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.