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Bluetooth cable missing?

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I checked if my HU803 has the external amp by checking it in DIAG mode. I think all R-models come with the external amp to begin with. I have a OEM 31285052 bluetooth but my question is about the MUTE RELAY connection. According to a XC90 install guide, there is a harness which is used ONLY with hte external amp. If internal amp is used, the 'mute relay' plugs straight into the deck. Am I correct? Can anybody tell me if besides the one harness (3042260Z02), I need a harness at the external amp??

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