After installing an aftermarket radio and wiring, there is no power to anything?

  • 2002 MAZDA 323
  • 1.6L
  • 4 CYL
  • 2WD
  • 140,000 MILES
Hey guys, firstly before I installed the radio, I wired the harness to see if power was running through the wires and the aftermarket radio turned on and everything was running. I decided everything was good and started connecting the speakers. I ran fresh speaker cables through the car and connected everything to the harness. I connected the power, acc and grounded the connection and nothing is working. I disconnected the speakers and just kept the power and acc connected and I'm no longer getting power as well as interior lights don't turn on or my remote locking doesn't work. I'm not sure if these two problems are connected but I'm having trouble finding a solution. Thanks
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have the same problem?
Saturday, August 13th, 2022 AT 8:01 PM

1 Reply


The Mazda 3 wasn't offered in the US in 2002. However, I believe the same vehicle was offered in Canada called the Protege SE. That is the only one that I have info on that has a 1.6L engine.

I went through the wiring schematics for the radio, interior lighting, and central locking. There is one common link that involves all of them, the Room Fuse (10 amp).

Do me a favor. The radio fuse and room fuses are behind the left kick panel. See pic 1 below. When you remove to inspect or reinstall, make sure the key is in the off position. If you leave the key in the on position, the malfunction indicator light will stay on.

I also attached the wiring schematics for the radio. However, I feel the Room fuse is the issue. I attached it so you have a reference.

When you check the fuse, make sure it is good. Also, check to make sure there is power to and from it.

Here is a link you may find helpful:

Let me know what you find or if you have questions.

Take care,


See pics below. Please note that this is from a Protege. It should be the same or slightly different.

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Sunday, August 14th, 2022 AT 8:52 PM

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