I have a 1992 1500 diesel that the a/c control box went out on. The a/c was working before the box went out. I have tried 3 different boxes so I don't think it is the box, has to be something electrical in the truck itself
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Try looking for a fuse box in the glove box. Even try opening both front doors and looking on the sides of the dash. O e other spit may be under the steering column. You will have to lay on the driver side floor looking up to find d it if its there
Remove injector N° 3 and another one ( N° 2 p.ex. )
exchange both and check wich one works.
If the actual connected to 3 works, the injector is faulty, replace the injector.
If the actual N° 2 works, the problem is in the injection control box, or the engine wiring...
Check continuity in the wiring, if OK, replace the control box.
you need to check battery supply most important. if the battery low voltage, cause no start. if the battery ok & strong energy. maybe the drive away protection control if this is the problem you need to bring to BMW dealer to replace control & ENCODE the control unit using SSS.