Cadillac STS trouble starting can only start from relay

Question by 713sts posted 6 months 3 weeks ago in STS

I have a 2006 Cadillac STS So when I press the break and hit start dash goes black then about 15 seconds later all functions resume no start though I have changed the alternator the starter and the ignition switch..only way I can start my car is with a paper clip or wire by Jumping the relay in the fuse box sometimes there is a shift to park message no check engine light only a brake light that stays on now and my car feels like it‚Äôs dragging when i accelerate from a light please any any info would be greatly appreciated ūüė≠¬†