Mark Levinson Nav unit: no power?
 

Hello all. I am a 1st time Lexus owner. My ES 300 is running great. Only issue is the nav unit. Previous owner said he lost DVD (trunk mount) which was why it wasn't working. I bought replacement DVD and tried to install, but it seems the trunk unit has no power. Checked fuses and tried to use a tester on power cable, but can't tell what is going on. Any help with location of 'special' fuse or how to troubleshoot? Thanks!