Pass-lock bypass

Well, that isn't a good thing, but it's connections like that that I mean. For instance there are at least 5 connections before the signal from the switch gets to the starting relay to make it click. One of those goes into the instrument panel harness, the next is under the dash on the passenger side going to the body control module. If another feed was on a wire next to it and got hot it could cause a problem.

Yeah, it can get that way quick. About the only way to find it would be to either trace the wire harness and look for damage or bad connectors. You might try a jumper wire from the start pin on the switch over to the correct pin on the body control module, that would bypass the connections. If it works every time you would know where the problem is. If not there then From the BCM out to the relay. Or if you could get a good scan tool on it you might be able to watch the switch modes to see if the BCM shows the start signal every time. Another possibility would be to see if a locksmith in your area could use their tools to do the relearn and at least eliminate that part of the problem, that would leave just the hunt for the starting issue.

No problem. It can get to be a real pain trying to find issues in modern wiring. Things that should be simple get run through computers and modules and make it much harder. The attached are the wiring diagrams for the starting circuit.

Okay, that means it at least is seeing the key as valid. Now we need to figure out why the switch start signal isn't getting to the relay. For that, verify that the start pin 3 on the switch is sending battery voltage when you turn it to start. If it does then go to the Body Control module and verify that the same signal is there on pin B8 in connector2 If it is then great, if not then that wire is open someplace. If it's good then check pin B6 in connector number 1 for the same signal. If its there good, if not then the BCM has an internal problem as they should be linked. From there it goes out to the start relay. If no signal at the relay the wire has an issue.