I have a copy of both blue shop manual that can be found online and the red Haynes manual, but they are lacking in some areas, especially with the wiring schematics for my '82 323i.
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- My E21(s): '81 323i Baur
- Location: The Netherlands
Re: Has anyone here used BMW's Aftersales Online System or Technical Information System for the E21?
The blue books mainly describe the pre facelift models, they haven't seen many updates since 1978. On the other hand and especially for the 6 cylinder models, the changes after that date are not huge. I know the blue books do have wiring diagrams which should help to find at least the color coding of the wiring (section 61). But other than that, the electronics of an E21 aren't too complex imho.