You can check for voltage at a couple of fuses. (Pcm--bcm--u/h--relay fuse) 10 amp. This fuse goes hot when you turn the key on, it is ignition feed, supplies voltage to the coil side of the crank relay.
Crank signal--bcm--cluster fuse 10 amp. This circuit goes hot when you turn the key to crank, tells the pcm to ground the coil side of the crank relay.
Usually there is a bare spot over each fuse leg, you can use a testlite to see if the legs are hot, or just pull the fuse, test where the fuse plugs in. You need to test, when the vehicle refuses to crank. Any testing may just lead back to the ignition switch.
Tuesday, July 1st, 2008 AT 8:52 AM