2003 Cadillac Seville STS, my right signals and hazard lights aren't working, all light bulbs and connectors are new, what could be the problem?

SOURCE: Chev Cavalier 2003 only one rear turn/brake/hazard light

I have a 2002 Chev Cavalier that had the same exact problem. I replaced the bulb harness (purchased from a chevy dealership for around $5) which was fairly easy to do. I have had zero problems with it since.

SOURCE: 2003 Cadillac Seville Key Fob

At the dealership with a computer.

SOURCE: I have a 94 cadillac seville sts, end I have a

First thing you have to do is list all the codes, because some some might be stored for a long time. Pushing the OFF and WARM buttons together and holding will ghive you all the stored codes. Then press OFF and HI together to clear all codes. Hold and wait for bars or 0's. Now start your car and let it get up to proper operating temps. Take car for aride that aincludes all phases of driving including highway speeds. Observe SERVICE ENGINE LIGHT for coming on . Assuming it does , repeat steps previously provided, read codes stored and repair accordingly. If need be contact me with new codes and I will try to assist you.

SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards

I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!

SOURCE: How do you change the brake light on a 2000

Open the trunk and locate the screw that hold the lense assembly, remove screws, turn the socket that holds the brake bulb which will releas the socket, pull out the bulb, and replace with new bulb, reinstall in reverse order.