Glow plug relay
 

hiya. looks like the cold weather is I may have a problem starting my 2.0d s40. The light only stays on for about a second even on really cold mornings. Just wondering how long the relay should keep power to the plugs.. Any advice would be appreciated..

I am also curious about this as mine is the same, fuse is intact but don't know where the relay is although I do hear it click

Glow plug time
 

The light on mine goes out in a split second but with Vida connected yesterday I can see that it was powered on for 12secs, after the engine fired it came on again for just over 2 minutes.
I have trouble with mine starting, grey smoke and rough idle for approximately 30 secs, I was checking the glow plugs but they seem fine.