Check if the telephone mute wire is touching metal. Inspect speaker wires for exposed copper touching the chassis. Antenna amplifier missing power.
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Note: Always verify your specific model's pinout configuration using a multimeter before making permanent splices, as some vehicle manufacturers swap Pins 4 and 7.
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: Blaupunkt is a real company that manufactures car audio and consumer electronics. You can find legitimate user guides for their products (like ) on their official manuals page