1. Toyota Dealership: You can contact a Toyota dealership and inquire if they have a wiring diagram available for your specific Landcruiser model and radio unit. They might be able to provide you with a copy or suggest other resources.
2. Online Manuals and Documentations: Some websites offer free access to automotive wiring diagrams and repair manuals. Search online for Toyota Landcruiser radio wiring diagrams and see if you can find any relevant PDF documents or online resources.
3. Automotive Forums: There are online forums and communities dedicated to Toyota Landcruiser enthusiasts and car owners. Join such forums and ask other members if they have a wiring diagram for your radio unit or can provide you with guidance.
4. Car Audio Websites: Websites specializing in car audio systems might have wiring diagrams for specific radio models. Check some reputable car audio websites and see if they have resources related to your Toyota Landcruiser.
5. Chilton or Haynes Repair Manuals: Chilton and Haynes are companies that publish automotive repair manuals. Check if they offer a manual for your Landcruiser model, which may include wiring diagrams. These manuals are available online and at automotive stores.
6. Previous Owner: If you are not the original owner of the Landcruiser, you can contact the previous owner and inquire if they have the wiring diagram or any documentation related to the radio unit installation.
Remember, it is always best to refer to the official documentation and wiring diagrams provided by Toyota for accurate and safe installation. If you are unsure about handling electrical components, consider consulting with a professional car audio technician or a mechanic experienced in working on Toyota vehicles.