I followed the intructions for the first step of the navi conversion. I understood the second step to fix sound so that the volume gets lowered when the navi talks. I thought that without the second step, the sound would still work but come over the normal sound.
I'll read it again now.
Quote:
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Non-nav CTSs are missing this wire harnessing from the factory. This works with the Bose amplifier only, since the base amp does not have provisions for audible directions.
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This is what threw me off. I thought I needed to have a bose amp to continue with step 2.