2007 yukon 5.3 NO Crank
#22
so pink (into bcm at c1 there are 3 pink) there is 12v at 2 of them......c3 connector unplugging the connector to test for v there is 4.4 at each out to tan wires from the BCM .hope i am following the correct path....
#24
OK have switching power through the bcm to the ecm (now understanding this is low voltage communication 4-5 v) the yellow /black coming out of the ecm (pin 52 )shows no resistance and supplies 12 v to the relay , at pin 86 of the relay receptacle the 30 recep has constant 12 ,but the ground 85 and 87 seem to be opposite positions .it does test a good ground . i tried every other relay under the hood in it and no crank
#29
no power to the starter from key , jumped the relay recept and starter turns , thought i felt relay click before but do not now . \\fuse between relay and starter does not power up with key , does with relay removed and jumper wire used





