Launched in 1996 in Brazil, the Fiat Siena is part of Project 178 consisting of a series of cars (Siena, Palio, Albea) developed on the same project but adapted to the various regional realities in which they are produced. The Siena in particular is a three-box sedan intended primarily for South American markets. The initial chassis is derived from the European Fiat Uno, with various modifications such as stiffeners and lengthened wheelbase, and as in the case of the Uno is designed by Giugiaro. The Siena underwent several redesigns, again by Giugiaro: the first in 2001, and the second in 2003, offering a more rounded front end. This version then remained in production until 2012.

The revision of the Fiat Palio Weekend is part of a second comprehensive revision of the Palio line. The update mainly concerns the engine aspect and the components that ensure safety. But in Europe, the new model featured a redesigned front fascia and interior with rear fascia similar to Palio 2001 version.

The restyling, always the work of Giugiaro, included extensive changes, partly due to changes in pedestrian safety regulations. The update involved the engines and the power supply, but also the body style, in lines and headlights.

It is basically a facelift from the previous models. The 2004 Palio was the first Brazilian model in the B-segment available with four airbags (two front airbags and two side airbags), parking assistance, and light and rain sensor. In Europe, the new model featured a redesigned front fascia and interior with rear fascia similar to Palio 2001 version.