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2007 yukon 5.3 NO Crank

Old Jan 27, 2016 | 04:30 PM
  #21  
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c-3 light blue tan wires?? out ?
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Old Jan 27, 2016 | 04:56 PM
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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....
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Old Jan 27, 2016 | 06:32 PM
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Originally Posted by 6kimages
anything to what group/wires i could check on the bcm?
According to the diagram on first page, at bcm is would be bcm c1 pin 2
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Old Jan 27, 2016 | 07:44 PM
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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
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Old Jan 27, 2016 | 07:54 PM
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Are you getting power to the starter when you turn the key???
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Old Jan 27, 2016 | 07:58 PM
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Pull the relay and jump 30 and 87and see if the starter turns over
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Old Jan 27, 2016 | 08:01 PM
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See if you can get someone else to turn the key while you put your finger on the relay... Quick easy relay test....
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Old Jan 27, 2016 | 08:19 PM
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Ignition Switch
Attached Thumbnails 2007 yukon 5.3 NO Crank-07-yukon-ignition.jpg  
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Old Jan 27, 2016 | 08:19 PM
  #29  
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Originally Posted by Wolftrk99
Are you getting power to the starter when you turn the key???
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
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Old Jan 27, 2016 | 08:23 PM
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Originally Posted by 2xLS1
Ignition Switch
thanks that will be a huge help !!! wish i could buy you guys a case of beer !!
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