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Handset Unit LEDS

WARNING: This page is about a different car, the 2010 Volvo V70, 2009 Volvo V70, and 2008 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Handset Unit LEDS
GLL167028Courtesy of VOLVO CARS CORPORATION

LED 1 indicates the battery charge level: 

LED 2 indicates the result of the breath test. 

LED 3 indicates whether the device is ready for a breath test: