In my spare time I've been chasing the 4WD service in the wife's 02 trailblazer. I'm set on pulling this code myself without a tech2 and am making some progress (http://forums.trailvoy.com/showthread.php?t=90204
I'm pretty sure I'm seeing a C0379 front axle actuator code.
here's the story:
turn the 4WD switch to 4WD:
* can hear the encoder motor and the front axle actuator.
* 4WD light keeps blinking
* service light comes on
* driving the truck 4WD and 4LO seem to work (all while the light is flashing)
replaced axle actuator from junk yard, same issue
removed actuator and ran outside of truck, same issue
took one of the axle actuators and there was grease on the connectors, cleaned and now it doesn't work anymore (no biggie)
checked connector and actuator, pins look good
checked wiring going into the main bundle, no sign of damage
replaced TCCM with a spare, same issue
what's next? I tried to read the signals on the actuator, but I'm not sure what to look for. the outer two lines seem to be power and the inner possibly command and signal - anyone know which color wire does what?
thanks for the help!