Unfortunately, the definition of which signals were present on each pin varied between vehicle models. Note the difference in pin ordering between the connectors and the fact that the letter I is not used. The pins are given letter designations in the following layouts (as seen from the front of the vehicle connector): General Motors implemented both a 5-pin connector and a 12-pin connector, with the 12 pin connector being used in the vast majority of GM cars. There were at least three different connectors used with ALDL. ALDL was largely used by manufacturers for diagnostics at their dealerships and official maintenance facilities. This system was only vaguely standardized and suffered from the fact that specifications for the communications link varied from one model to the next. Assembly Line Diagnostic Link or ALDL was a proprietary on-board diagnostics system developed by General Motors prior to the standardization of OBD-I.ĪLDL was previously called Assembly Line Communications Link or ALCL.
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