I feel like that ship sailed long ago (unfortunately), with the trend of replacing entire subassemblies rather than building devices/subassemblies to be field d

I feel like that ship sailed long ago (unfortunately), with the trend of replacing entire subassemblies rather than building devices/subassemblies to be field diagnosed and repaired. Semi-related rant: I recently bought a Haynes manual for a '15 Civic. I figured it would, at the very least, have thorough wiring diagrams and describe the physical layouts of the wiring harnesses. Nope - over half is just generic information about tools and general car repair. The "wiring diagram" is woefully incomplete - it shows one single reference to a "CAN Bus" off the ECU, rather than the 7 or so devices on one bus, and 10+ on the second bus. Luckily I managed to stumble upon a 15k-page OEMish service manual that details a lot of this stuff (via procedures, rather than easier-to-read diagrams, but at least its authoritative). I know car repair information has been obfuscated and proprietarized by manufacturers, but it looks like Haynes isn't even trying. Either at least document what's physically there, or just stop pretending to sell a repair manual. (I'm not opposed to going to the dealer if I can't figure it out. I've just heard too many stories of people having electrical/control issues, and the stealership goes on a wild goose chase replacing part after part. So I figured I'd take a crack at it first)