Well I was driving to work this morning, my intermittent aircon fault was in full effect so that the air was going full blast & heat with the two aux fans infront of the rad going at full speed too. <img src="http://www.mbclub.co.uk/iB_html/non-cgi/emoticons/mad.gif" border="0" valign="absmiddle" alt=':angry:'> I was crawling in traffic going uphill, so holding the the car on the accelerator, when the BAS/ASR malfunction indicator lamp decides to light up <img src="http://www.mbclub.co.uk/iB_html/non-cgi/emoticons/sad.gif" border="0" valign="absmiddle" alt=''> My foot wasn't near the brake pedal when the lamp came on. I drive for a couple of miles then stop behind some red lights, I took the opportunity to switch off and remove key for approx 30 seconds. Switch back on and the light remained off for the rest of the trip and never came on again for the rest of the day. I remember reading in the hand book "If the electrical voltage drops below 10 volts, the malfunction indicator lamp will also light up in the instrument cluster and the Brake Assist System (BAS) will be de-activated." I'm guessing this was the cause of my light illuminating today given my a/c was like a jet in take-off and must have been taxing the battery but my question is will the car ECU keep a log of this particular fault? Also will it log the fault indefinitely until someone links up with diagnostic software? Sorry for the long post. Thanks, S.