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<blockquote data-quote="popeadrian" data-source="post: 157053" data-attributes="member: 2065">Dude,ITs called Speed Sensitive volume function <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" />&nbsp;&nbsp;To change the Speed Sensitive Volume Ratio on the E46 Business CD Head Unit: Turn the radio off then on again. Don’t touch any button except the &#039;m&#039; button - the button you use to tune the radio frequency manually. Press and hold the &#039;m&#039; button for TEN seconds or until the display changes. It will then show the serial number of the unit. Normally when you press &#039;m&#039;, the display will reflect that by replacing &#039;ST&#039; (stereo tuning) with &#039;m&#039;. When holding the &#039;m&#039; button for this procedure, the display should not do this - you will continue to see &#039;ST&#039; for the ten seconds. Now if the display has changed, you are in a configure mode on the radio. If you press the &#039;&gt;&#039; or &#039;</blockquote>

[QUOTE="popeadrian, post: 157053, member: 2065"] Dude, ITs called Speed Sensitive volume function :p To change the Speed Sensitive Volume Ratio on the E46 Business CD Head Unit: Turn the radio off then on again. Don’t touch any button except the 'm' button - the button you use to tune the radio frequency manually. Press and hold the 'm' button for TEN seconds or until the display changes. It will then show the serial number of the unit. Normally when you press 'm', the display will reflect that by replacing 'ST' (stereo tuning) with 'm'. When holding the 'm' button for this procedure, the display should not do this - you will continue to see 'ST' for the ten seconds. Now if the display has changed, you are in a configure mode on the radio. If you press the '>' or ' [/QUOTE]

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