Insert a wire hanger bend into a "U" from the console area
up to the DIN opening. Tape the reverse wire and run it down to the console
to the grounding screw
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If you fail to ground the TP, it will think your car is always traveling
in the wrong direction. Interestingly
enough, this has no effect whatsoever on the unit. It figures it out just
fine in the calibration step. HOWEVER --- (imporatnt safety tip) If you
then ground it without deleting the current calibration (Pres NAV, NAV,
then press soft-functions 3 then 5 to enter service mode and scroll to calibration),
your unit will get hopelessly
lost.
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If you ground it, it will now know it's ass from it's elbow
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