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After installing an aftermarket cd player, the speedometer quit working. when the bass hits on the speakers, the needle bounces up and down along with the bass.
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either your connectors need cleaning or maybe a break in the wiring. Is there on spot where both wires come together if so check there.If there is any plugs, pull them apart and clean them with contact cleaner
The speedometer sensor - VSS - vehicle speed sensor is a input to the PCM - powertrain control module -engine computer . The signal from the PCM to the instrument cluster for speed info. is sent on a serial data communication network (class 2 ) I would think it would be an instrument cluster problem . Get a used one from a auto salvage yard 15 - 20 bucks an see if it fixes it . If it does ,send your's out an have it repaired .
when the sensor was installed it was installed wrong.
They wired it into the turn signal feed.
have your dealer or, an auto electrician fix the wiring to your sensor.
Is your IP Bus cable on the INPUT and not the OUTPUT ? I know it sounds funny, but usually(95%), that's the case. If it's in the wrong plug, you'll have power and a display, but no audio. That's why your getting data but no audio.
you need to RE-Ground the Dashboard. Find a Nice Think piece of steel to mount a 12 gauge wire and find a spot "Maybe the Bolts to the Steering Column" or another Good Body ground..
Everytime you hit bumps OR shake the dash you are losing the Ground to your dash, Ford Loves to Ground to Dash and then use a Cheap ground.
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