Can anyone Help!!!

[Obsidian black]

I have a 2002 q45.....I do t even know where to begin. First my radio stopped working. I checked for blown fuses; all were fine. So then I tested the actual contacts for the radio fuse and there was no power going to that terminal. Okay. Second now for some reason my dash lights went out; a/c went out; now my center display is black. Third now my car will not start. Can anyone please help!

[Skibane]

I have a 2002 q45.....I do t even know where to begin.

Best place to begin is by downloading a copy of the 2002 Q45 Factory Service Manual (or "FSM"). This is a MUST-HAVE item for any Q45 owner who works on his own vehicle - Without it, you are just guessing.

The FSM includes wiring diagrams, including a POWER SUPPLY ROUTING Schematic in the PG section (on page PG2) that shows how every electrical device gets power, and what path the power takes to get there. That should give you some clues as to where look for problems.

[AZhitman]

Have any modifications been made? Aftermarket radio or electronics?

[AZhitman]

Have any modifications been made? Aftermarket radio or electronics?

[elwesso]

It would seem unlikely that this would happen unless someone has been in there messing with stuff..

[Obsidian black]

@skibane thanks a lot for the post. I'll view it in more detail when I get off from work. Hopefully I'll be able to figure it out.

[Obsidian black]

@Azhitman No modifications have been made. Everything is stock.

[Obsidian black]

@elwesso I checked all fuses in the cabin. They were all good. The only problem was there was no power to the fuse side when I tested with a test light. Now everything is messed up.

[Skibane]

now for some reason my dash lights went out; a/c went out; now my center display is black. Third now my car will not start.

The IGNITION RELAY and associated 50 amp fuse "B" (highlighted in green) would be good parts to check, since they supply power to some of those items.