i have this truck i bought to build for my self , i have replaced alot of the modules cluster , radio , climate control, abs module , transfer case module , bcm , truck runs everything works but steering wheel controls ,4x4 has service 4 wheel drive , abs lights are on brake light on , air bag light on ,?dealer could have programed the bcm incorrect ? is there a way for me to check the comunications at every module in that line and wires to see what is going on ? been working on this for a few months ? any help is greatly appreciated,,

 

Every module you replaced needs to be reflashed for the VIN of your truck. Only way to do that is a trip to the dealer. Without doing that you are wasting your time when the modules are flashed they contain specific rpo options for your truck and that's what makes options like steering wheel controls and climate control work correctly.

And once that is done there are several learn routines that can only be sone with gm's tech2 2 and items such as 4wd will not work until the learn routines are completed.

 

You would need a factory type scan tool to tell you what's online and active with the system.

As mentioned The modules have to be programmed properly in order to work correctly. You need to have a subscription to the factory Information. Then you have to learn some of the modules as mentioned for certain things to work properly.

Most shops are not equipped with the correct equipment to do this. Either take it to the dealer or find a some one that specializes in Module reprogramming in your area.

 

thanks for the info, i dont get stumped on these very often ,lol. i have my own shop ? i took it to the dealer and had it reflasherd learned took me for a ride still the same they say there is a comunication issue ? i un plugged the conecctor in the block down by your left toes , and more things are conunicating , also when the 4x4 switch in 2wd i plug in the front axle acuator and it locks in ? any idea on a wire schematic for the 4wd control? thanks

 

Did they use the tech 2 and perform a transfer case position relearn after programming transfer case control module? What modules aren't talking?