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Your right, using the "4 mute" method of unlocking the driver's restrictions have the undesired effect of disabling the nav. However, the Gen4 manual says that there is an automatic method of removing the drivers restictions by moving some jumpers around. Perhaps that setting will enable the...

Greetings, I have an 08 Chevy Tahoe LTZ & have recently installed the Gen IV Lockpick from Coastal Tech. Ever since the installation, the GPS position report & internal nav unit compass are not working right. Generally speaking, I notice about a 90 degree discrepancy in compass readings...