![]() The SW automatically sends as a diagnostic device and will recognize responses to those requests which makes talking to devices MUCH easier. Other things about these buses is that the high priority bus is true CANBUS where the low priority bus is a Single wire CANBUS compatible network.Īlso note that the ScanXL Pro software does a lot of the work for you so if you decide to do this yourself programmatically or in a different program you MAY need to send more information. In 2006 GM switched to using a 500k baud "high priority" bus for items that need very fast updates and a "low priority" 33k baud bus. I believe this program requires you to use ODBII scanners from Scantool which all are compatible with our trucks regardless of year. The bus in pre 2006 is a single GMLAN using older connection technology at aproximately 10k baud and may NOT work with some newer ODBII dongles that rely on CANBUS. In pre 2006 vehicles I believe this bus is open to everything but I have not tested this theory. ScanXL Pro has a terminal section that allows you to talk directly to the ODBII bus that you are hooked up to. ![]() Be aware that GM changed over to the CANBUS network in 2006 in our trucks and most GM vehicles. This worked in my '03 and may or may not work in other years. Note this thread was started in reference to some people wanting to be able to trouble shoot modules in their trucks.
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