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 MANUALSACURA2004TL AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESHANDSFREELINK SYSTEM
2004 Acura TL Automatic
HANDSFREELINK System
2004 Acura TL AutomaticSECTION HANDSFREELINK System
- Component Location Index
- General Troubleshooting Information
- Circuit Diagram
- Control Unit Input Test
- DTC Troubleshooting
- DTC B1751: Hands Free Link Control Unit CPU Error (Anomalous CPU)
- DTC B1775: Microphone Input/Output Short to Power/Open
- DTC B1776: Microphone Input/Output Short to Ground/Open
- DTC B1779: HFL Switch or HFL-Voice Control Switch* (HFL TALK/HFL BACK Buttons) Open/Short
- DTC B1780: HFL Switch or HFL-Voice Control Switch* (HFL TALK/HFL BACK Buttons) Short
- DTC B1792: Hands Free Link Control Unit Internal Error
- HFL Switch/HFL-Voice Control Switch Test/Replacement
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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.