Those cars will have certain modules (ECUs) inside that will require a diagnostic mode called ADS to be accessible. You have an E30 to E36 BMW that makes use of the L-Line, you can see that pin15 of the 20pin socket is installed / wired. In simply words, if there is a 20pin socket available – it must be used for factory diagnostic.įor BMWs after 1987 equipped with the 20pin OBD1 socket there are two possible scenarios, let us get now into details: In those cases it’s important for you to know that you will still have to use the 20pin connector for those cars since the 16pin OBD2 socket found in those cars does not have all modules connected. Most of the BMWs built from 1996 to 2000 have both the 16pin OBD2 socket AND the round 20pin socket.
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