2005 Lexus GX 470 Owners Manual - Page 502

DRIVING TIPS Brakes and safety chains D Lexus recommends trailers with brakes that conform to any applicable federal and state/provincial regulations. D A safety chain must always be used between the towing vehicle and the trailer. Leave sufficient slack in the chain for turns. The chain should cross under the trailer tongue to prevent the tongue from dropping to the ground in case it becomes damaged or separated. For correct safety chain procedures, consult your Lexus dealer. Service connector for towing brake controller CAUTION D If the total trailer weight exceeds 453 kg (1000 lb.), trailer brakes are required. D Never tap into your vehicle's hydraulic system as it will lower its braking effectiveness. D Never tow a trailer without using a safety chain securely attached to both the trailer and the vehicle. If damage occurs to the coupling unit or hitch ball, there is possible danger of the trailer wandering over into another lane. Your vehicle is equipped with a service connector for the towing brake controller as shown. Link the connector to the towing brake controller via the sub wire harness stored in the glove box. The detailed explanation of the sub wire harness circuit is packed together with the sub wire harness. Be sure to position the towing brake controller where it does not prevent the driver from operating the pedal. Lexus recommends that the sub wire harness be stored in the glove box when it is not in use. 477