I have a 1980 240d and I'm trying to debug the glow plug system. The relay (module) would fail to ignite every now and then, but I could get it going with a sharp rap with the knuckle.

The other day, however, it wouldn't go at all.

I would like to verify that this is the problem. I have seached the forum for diagrams/pinouts but most of the links appear to be broken.

Does anyone know the pin out for the module? The p/n I have is 001 545 35 32.

The pins are labeled: NTC, 15, G on the top row and 31, 50, 30 and LA on the bottom row.

I can tell that G is to the glow plugs, 30 is the Vbat, but what are the rest?

Thanks.