Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA2009MDXREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSHANDSFREELINK SYSTEM
2009 Acura MDX
HANDSFREELINK System
2009 Acura MDXSECTION HANDSFREELINK System
- Component Location Index
- General Troubleshooting Information
- How to Check for DTCs with the HDS
- Introduction
- Checking Cell Phone Compatibility
- Voice Control Tips
- Navigation Through Menus
- Pairing a Cell Phone
- Pairing Troubleshooting
- Dropped Calls
- Phone Will Not Automatically Connect the HFL
- Incoming Calls
- Outgoing Calls
- Glossary of terms
- Clearing the system
- Self-diagnostic Function
- Symptom Troubleshooting Index
- Circuit Diagram
- HFL System Troubleshooting
- DTC Troubleshooting
- DTC B1775: Microphone Input/Output Short to Power/Open
- DTC B1776: Microphone Input/Output Short to Ground/Open
- DTC B1779: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Open/Short
- DTC B1780: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Short
- DTC B1785: Incorrect Configuration (VEHINFO Frame)
- DTC B1786: HandsFreeLink Control Unit Lost Communication with Gauge Control Module (VEHINFO Frame)
- DTC B1792: HandsFreeLink Control Unit Internal Error
- Symptom Troubleshooting
- HFL Switch Test
- Control Unit Input Test/Replacement
- HFL/Navigation Microphone Removal/Installation
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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.