The connector is usually located under the dash on the driver's side of left-hand drive (LHD) vehicles, though this location was not standardized.įor the assembly plant test system computer that was connected to this vehicle connector and known by the same name, see the article IBM Series/1. 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. It was previously called Assembly Line Communications Link or ALCL.
Assembly Line Diagnostic Link or ALDL is a proprietary on-board diagnostics system developed by General Motors before the standardization of OBD-2.
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