interior lights issue

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mikemhp

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2004 yukon slt 2wd.
replaced computer, reset security lockout code with the key, starts up great now.
however, everytime it starts, the heater comes on full blast no matter what setting it is on and the dashboard lights stay illuminated after removing the key which slowly drains the battery.

any tips?
 

swathdiver

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is that a type of scan tool?

Yes, it is the tool made to work on GM vehicles from the 1990s until these trucks. It can check all codes, perform tests, run graphs, record data for later playback, program modules, etc.

It's more important than a wrench for without it we're usually guessing.
 

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