If you start the engine without waiting for
the glow control lamp to switch off , you going to discharge the
battery with the cranking current and the glow plug current. This
allows the Battery voltage to go lower than 11,5 Volt for a short
periode of time. The SRS Unit (Airbag controller) implies a failure
and the failure code will be saved. In order to not go for a
Failure buffer underrun, you should wait for half a second.
(earlier : Rudolf-Diesels-memorial minute ;-).
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