[2] The development for the first-generation Boon was led by Toyota chief engineer Tetsuya Tada.

In early 2005, Daihatsu launched the Japanese-built 2nd generation Sirion in Brunei using the facility and parts from the Boon.

Sporting a few cosmetic differences, the Myvi became Perodua's best-selling car in Malaysia for 2006, 2007, 2008 and 2009.

The Boon Luminas and Passo Sette were discontinued in early 2012 due to poor sales.

[12] The third-generation Sirion for the Indonesian market was unveiled at the 19th Indonesia International Motor Show on 23 July 2011.

[13] In April 2013, Toyota New Zealand announced its decision to stop selling the second-generation Sirion, still on sale, stating it was unable to secure Daihatsu products that comply with future regulatory standards for New Zealand.

The Passo has an improved collision avoidance support system (Smart Assist III) which can grasp various information such as pedestrians, vehicles, preceding and oncoming vehicles, and obstacles and then activate various driver assistance systems such as alerting the driver or switching between low and high beams.