Tow haul button not working

[LOWTAHOE2]

I know this topic has been beat to death but I have this problem as well. It has a brand new shifter and it still doesn't work. Does anyone have a diagram for it? Can any one tell me possibly where the wiring goes or a power source .

 

[2004LB7]

what year?

 

[LOWTAHOE2]

2004 DURAMAX

 

[2004LB7]

this is all I was able to find right now. looks like you should ohm out the line down to the BCM

 

[LOWTAHOE2]

Any chance you have a list of the locations on those diagrams ?

 

[2004LB7]

the BCM is under the steering column. lay on the floor down by the peddles and look up by the column and you can see the TBC (BCM). the other side is of course the tow haul button. pull the connection J3 off and test the B11 terminal to ground when pushing the button