05 Security light no crank

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To start off my son called and said the horn was beeping in the navigator and wouldn’t stop even with remote. Told him to unhook the battery and I would check it when I got home. Hooked battery up but was dead. Charged battery and rebooked it. No crank. Changed starter. Still no crank. Noticed security light keeps flashing with both keys. Rear hatch won’t open with overhead switch/fob or handle on door. Will open and close but not pull tight with scanner. Still no crank but can here relay in fuse panel clicking. Any ideas? Thanks for help in advance.