If not remove the radio and check the connector at the back. You will then know the nav unit is actually giving out an optical signal. With the radio one also look at the fibre end and make sure you can see a red light on one of the fibre lines. ![]() This has been known to come off breaking the ring and you lose everything. There is a port under the glove box, this has an end on it that has coupler attached.īasically the ring is a a fibre optic ring, at this point there is a loop that you can unplug and attach diagnostics too. There are certain places where your most ring connects together. Has anything been done to your car at all recently? The USB in the glove box goes straight to the head unit, it is not on the MOST fibre optic ring that everything else is connected to.
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