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Fits all GM vehicles with Anti- Lock Brake Systems (ABS) from 1988 topresent. Allows technician to access ABS trouble codes for fast easy diagnosis Also may be used to erase trouble codes Two way key connects into either A to G or A to H terminals at ALDL connector under dash Provides good connection between terminals Eliminates use of jumper wires which could cause damage if wrong terminals are connected together 2 Tools in 1