2008 Toyota Sequoia Owners Manual - Page 273

2-5. Driving information Service connector for towing brake controller (with towing package) Your vehicle is equipped with a service connector for the trailer brake controller as shown. Access the service connector. Remove the scuff plate. Remove the clip (screw type) and trim board. 2 When driving Connecting trailer lights Use the wire harness stored in the rear end under body. 4 pin, 7 pin connectors 239