2003 Toyota Tundra Owners Manual - Page 216

'03 TUNDRA_U (L/O 0208) TIRES D Ensure that your vehicle's tires are properly inflated. See Section 7-2 and Section 8 for instructions. TOWING LIGHTS CONNECTOR FOR TRAILER D Your vehicle is equipped with a wire harness stored in the rear end under body. Some models are fitted with a socket for trailer lights under the rear bumper. Use either of them to connect and operate the trailer lights. However, the trailer lights must comply with federal, state/provincial and local regulations. See your local recreational vehicle dealer or rental agency for the correct type of wiring and relays for your trailer. Check for correct operation of the turn signals and stop lights each time you hitch up. Direct splicing may damage your vehicle's electrical system and cause a malfunction of your lights. 7-pin connector (with towing package)-This can be also connected to the trailer brake and trailer sub battery. D The trailer tires should be inflated to the pressure recommended by the trailer manufacturer in respect to the total trailer weight. 4-pin connector 7-pin connector 216 2003 MY TUNDRA (OM34419U)