press the diagnostic button for 3 seconds , then it will blink, after code is read via number of flashes pressing longer than 6 seconds erases code if there are more than 1 code , bring it up and press longer than 6 and cycle key when finished to clear instrument code light , 1 flash means no fault

the diagnostic module should be under rf footwell under the panel

Not that I couldn't be wrong, but I thought I'd figured out that N59 diag module was the silver box with the securing knob on it under drivers dash left of steering column? Per this diagram: http://ww2.justanswer.com/uploads/PE/peterpete190/2013-03-08_161437_diagnmodule.gif

Far as I can tell, big yellow sticker under hood saying it conforms to all fed and cali smog, this is a california car with the OBD stuff.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K

very good yes thats it it has that twist knob on top,try unplugging it and rechecking, ive seen them quit working and need hard restart

Found the SRS light socket, good bulb, no light on key on. Just like the CEL.

I ordered an OVP just on principle.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K

Miracle of miracles, that appears to have done it.
Thank you!

Still no SRS light but I'll cross that bridge a little later.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K

Nope, diag LED is on dimly anytime the key is on, gets brighter when pressing button, no blinking or turning off at all happening. I wish it worked that way.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K