Will a bad UEM keep the car from cranking?

Thanks for the reply. I’ve got a good hot battery with 13 volts. I’ve been working on this car for a while. When I first got it it would crank and start. But if you turned it off it would restart unless you disconnected the battery. Now it won’t crank at all. The starter relay is not getting a 12vol...

I’ve had the cem ecm and key checked. I’ve checked the pins on the connectors and still nothing. I’ve scan the system and I’ve attached a picture of the scan. Any suggestions is welcomed. Thanks

I have a 05 S60 that will not crank. I’ve had the CEM and ECM checked along with the key and they said that they are communicating on their test board. They said that it must be a brake in the wiring harness. I’ve checked conductive on all the pairs of wires that I can identify. Does anyone have a d...