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Be aware CarMD with its internet-based database will provide you much more information than you'll get from any scanner, even manufacturer-supplied units the dealers use, but it is not "bidirectional". That means you can't use it to perform actuator tests or to reprogram computers. To turn relays and other circuits on and off, you'll need a full scanner. Costs for the better ones start at around $3000.00. Even with their capability to reprogram some computers, you'll still have to buy access to the manufacturer's web site. Reprogramming is not any part of a typical do-it-yourself diagnosis and repair and is not covered on here.
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