Wow! It looks like reversed polarity or a short caused a high current and burned the components. R usually stands for resistor, D for diode and C for capacitor. B usually stands for battery but that doesn't make sense in this case. I would guess that B202 is a inductor or coil. L usually stands for coil on U. S. schematics, but maybe VW uses B for the B field associated with a coil. 

Sent from my iPhone

> On Sep 13, 2014, at 9:40 PM, Neil N <musomuso@GMAIL.COM> wrote:
> 
> Hi all.
> 
> As promised, the gory details. Images of my partially fried ECU:
> 
> https://picasaweb.google.com/musomuso/Motronic29ECUBurnedPartsEngineStillRan
> 
> Can anyone take a guess at what this part is, or was?   ;)
> 
> B202 shown here:  http://tinyurl.com/qxeceae
> 
> My close up shots are usually better. Sorry for poor quality images. I
> generally don't use my good camera while in the shop.
> 
> Neil.
> 
> --
> Neil n
> 
> Blog: tubaneil.blogspot.ca
> 
> '88 Westy http://tinyurl.com/c8rlw6p
> 
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
> 
> Vanagon VAG *Gas* inline-VR Engine Swap Group:
> 
> http://tinyurl.com/d7gd5ej