No interior lights, stereo not working. Checked and replaced fuses but no luck

The stereo installation's weak connection is the most likely source of this problem. Make sure the wiring harness is secure by inspecting it. If it doesn't work, it could be necessary to disassemble the door panel to check that all the connections are made properly. If the wiring is correct, you might need to consult the vehicle's wiring diagrams to conduct additional troubleshooting.

Fusible link blown?

Very Possible it is your fuse, the only thing that makes me think otherwise is that your problem is intermittent. When a fuse blows, things stop working they do not work intermittently. If you recently installed a stereo, check the harness for crossed connections or exposed wiring that may be causing a short. When you blow the fuse for the stereo it usually takes out many of the interior electronic accessories such as Interior dash lights, electronics door locks, dome lamps, etc. Check the fuse box likely under the dash, if not in a corner of the engine compartment under the hood and find the diagram for the fuse lay out. Check the fuse for the stereo or interior accessories or for the door locks. problem could be with the wiring for either.

Michelle, I would recommend taking your vehicle to a local Car Stereo Shop or the dealer. It sounds like your son may have tapped into the incorrect wire in the harness when putting in the new stereo. It sounds like a problem of ignition wire is going to ground. Or the constant power wire is going to ground. Either of these issues would cause this problem.

check wires running through harness inside the crease of the drivers door by the hinges for breaks

check with a ohm meter at light sockets for 12v . If you do not have voltage,possiably a broken wire leading away from fuse block or worst case scenario behind fuse panel. Light wireing could be a complete harness for all lights mentioned. Good luck.

The SJB supplies power to the interior lighting system. The SJB will set DTCs if certain circuit failures exist with the interior lighting system.
Visual Inspection Chart Mechanical Electrical

• Courtesy lamps
• Map lamps
• Luggage compartment lamp
• Vanity lamps
• Glove compartment lamp

• Smart junction box (SJB) fuse 3 (15A)
• Circuitry
• Courtesy lamps
• Map lamps
• Luggage compartment lamp
• Vanity lamps
• Glove compartment lamp
• SJB

Check fuse # 3 SJB

There is a module built into the instrument panel that controls the interior lights. If that thing goes bad, you have to replace the entire instrument panel. Everyone always says check the fuses, of course you would have done that before running to your computer to ask a stranger what to do! The instrument panel is expensive, I hope thats not your problem, thats my problem. Good luck.

fuse is blown

I would be concerned that you may have wired the stereo incorrectly, causing this shorting problem. I suggest that you take it to a stereo installer to check the wiring, as if it is wired correctly the stereo should at least light up with a new fuse in there. Unless the new fuse blew straight away when you put it in. The central lock is likely to be thrown off by the fact that the interior light isn't working, as it uses this input to figure out if the doors are open or shut. Check interior light fuse condition, and get the wiring you've done checked, would be my advice.