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 MANUALSVOLVO2003XC70REPAIR AND DIAGNOSISELECTRICALGAUGESAUDIO MODULE (AUM), PHONE MODULE (PHM), ROAD TRAFFIC INFORMATION (RTI) DIAGNOSTIC TROUBLE CODES (XC)AUM-40FF: AMPLIFIER, MAIN ANTENNA. SIGNAL MISSING. INTERMITTENT FAULT (2001-2007)DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
2003 Volvo XC70
Diagnostic trouble code (DTC) information
2003 Volvo XC70SECTION Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) AUM-40FF is stored if the head unit/audio control module registers that there is an open-circuit in the power supply to the main antenna or a faulty installation.
Possible Source
- Open-circuit in the power supply from the head unit/audio control module to the main antenna.
- Main antenna not installed.
- Defective antenna amplifier.
Fault symptom[s]
- Poor radio reception (AM).
RENDER: 1.0x
NO RELATED
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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.