In this instance i vote for the K40 relay also. It is probably responsible for cutting power to the shutoff solenoid when driving and the GP relay when trying to start.

The CEL is not on, right?

The K40 is number 98. http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=210020&M=606%2E912&GA=722%2E438722%2E600&GM=717%2E446&CT=F&cat=45P&SID=54&SGR=040&SGN=03

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)