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View Full Version : One touch engine start like MB on Audi A3 8P



jruibarroso
7th September, 2011, 06:17 PM
Hi , i'd like to present my last modification on my Audi A3 8P >2004 . It's a one touch start engine like mercedes . Only one press on key , no need to press until engine running.
On following PDF there is Steering Column Electronics Unit and Onboard Supply Unit.
Solution is add a 1000uF/16v capacitor between pin 18 (red/black wire) and GND (Pin 20 - Brown wire) on J527 Steering Column Electronics Unit (see PDF). With this , contact 50 will be closed about 3 seconds, enought to start engine even when it's hot, when start period is longer.

Joe019
11th September, 2011, 09:24 AM
Nice Work m8!

Very usefull. :D

BR!

jruibarroso
11th September, 2011, 10:32 AM
few days with this altertion running and i realised capacitor must be at least 1500uF, some times , when engine is hot takes more time to start .
Solution must be one 1000uF + 470uF = 1470uF (1500)