Tom,
Mine has it as a factory option,
That is the pattern : engage tone, followed by intermittent beeps which increase in speed as the objects become closer until a continuous beep is sounded - which signifies you are close or have even hit the object - ha ha.
Its deffo internal but i have never really paid much attention to where it comes from - its almost like its under the seat?
I'll have another listen this weekend and let you know
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Don't care......was made to care! (my Mum)
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