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Z150 bypass problems


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I installed a z150 into a truck about two months ago and it seemed to work fine for about two weeks then I started having problems.  Original install was moving the mute wire over and grounding it along with the pb wire.  After two weeks it stopped working when driving, today I pulled it apart and everything was connected correctly but I have had different people say the bypass is different ways so I tried them all.  Cut vss and grounded mute and pb and it works but a message on the nav comes up saying no speed sense detected will start callibration.  reconnected vss and ground mute and cut pb, this only works when stopped.  each time I have disconnected power and reset radio anyone seen this? 

 

will the message go away for the calibration? I drove the car almost 50 miles and it never shut off

 

HELP!!!!!!

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