Retrofiting nav system in mercedes w211?

2003 MERCEDES BENZ E240
160,000 MILES • 2.6L • V6 • 2WD • AUTOMATIC
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DOMINIK1234
  • MEMBER
  • 12 POSTS
Hello — I want to upgrade my W211 Mercedes from the Audio 20 (standard radio) to an NTG1 satellite-navigation system. I’ve read forum posts from people who have completed this upgrade, but I can’t find a wiring diagram or reliable technical information. Could you help?

My vehicle currently has the Audio 20 with the 6-CD changer. The Audio 20 uses a quadlock connector with two MOST fiber-optic cables. The NTG1 uses different connectors: one connector with two MOST fiber-optic cables and four pins, and another connector with three small pins. Any assistance would be appreciated.
Dec 3, 2025 at 9:20 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,553 POSTS
Hello,

The cleanest route is often an off-the-shelf W211 COMAND retrofit loom (used by retrofit shops). If not I would get a after market head unit that has navigation built in. Ken
Dec 4, 2025 at 1:02 AM
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