by the way, I looked at my 16-pin diagnostic connector, and apparantly it is a California model, as it has a button + LED already mounted on the connector... so, I understand how a regular code-reader works, but which pins do I bridge on my connector for the switch+led to work???

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1991 MB SL300, 1994 Sub 4x4 6.5L TD, 1986 K30 4x4 6.2L, other toys
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"Back up four feet and floor it..."