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If you turn it on, the volume will change depending on your speed to compensate for engine noise.
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Settings->Audio settings->SVC->Off
Volume Control Light Control Speed/Frequency Control Temperature Control
Push the radio tuner knob in, it will cycle through bass, treble...etc, when you get to ACL, set it to your desired level, it is 0(ff), 1, 2, 3(max).
Volume Control Light Dimmer Tone Control Bass Control Treble Control Fan Speed Control
The 2006 Lexus IS-250 has a 6-speed manual.
The 2010 Lexus IS-250 has a 6-speed manual.
The 2011 Lexus IS-250 has a 6-speed manual.
The 2012 Lexus IS-250 has a 6-speed manual.
The 2008 Lexus IS-250 has a 6-speed manual.
The 2007 Lexus IS-250 has a 6-speed manual.