99 Corolla main power--what have I done?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=9611
Printed Date: July 17, 2025 at 2:16 PM
Topic: 99 Corolla main power--what have I done?
Posted By: stalsma
Subject: 99 Corolla main power--what have I done?
Date Posted: February 16, 2003 at 4:52 PM
Being a newbie to electronics, I mustered up the courage to install a Pioneer CD changer in my girlfriend's 99 Toyota. Mounting and running cables went fine. But something happened when I connected the power.... I reviewed the wiring diagrams posted here (https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1999&make=Toyota&model=Corolla&ID=18981&type=Stereo). I hooked up Switched 12 v to the changer w/ no problem (the wire was pinkish/brown--there was no grey wire)). When I hooked up the 12 V constant, I think I blew out a fuse. Now neither the door ajar indicator on the dash panel nor the interior dome light nor the radio (or CD changer) respond. All other electronics seem to be functioning. I checked all the fuses (below the steering panel behind the little storage drawer); they seem to be all intact. The fuse on the constant power wire to the CD changer is also intact. So now the questions: - Am I missing a fuse somewhere? Am I doing something fundamentally wrong? I pulled all the little colored fused, and none appear to be burnt out. Are there other fuses located elsewhere? Maybe something wrong w/the wire itself?
- How do I go about debugging this? Next steps to take?
I am totally open to suggestions. Many thanks in advance, Scott Talsma
Replies:
Posted By: Velocity Motors
Date Posted: February 16, 2003 at 5:01 PM
Make sure that you used a DMM in order to test all fuses. Some fuses seem to be OK upon inspection from the naked eye, but when you test with a DMM or light tester the fuse is infact burned out. Did you test all the wires prior to hooking them up or did you just hook them up according to the diagrams ?
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: stalsma
Date Posted: February 18, 2003 at 4:47 PM
OK--I just tested all the fuses w/ a multimeter. All the colored fuses tested out OK. However, there was a large black "fuse" located just under the other fuses. At least it looked like a fuse. There were no markings on it. I removed it, and tested it as well--it was dead. The question is whether this device was a fuse or not. Any ideas?
Posted By: Velocity Motors
Date Posted: February 18, 2003 at 5:16 PM
This is probably the fusable link. Go to your local car parts store and get a new one. If they don't have one then go to your local dealership for one. It may cost you more than $ 5.00 for this fusable link at the dealership though.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: Chris Luongo
Date Posted: February 18, 2003 at 5:40 PM
If it's large and black, it might just be a relay.
The radio's constant power, as well as the domelight, share the same fuse. It is common to blow this fuse during installation, especially if a proper adapter plug isn't used.
Go and carefully check the 7.5-amp domelight fuse again; I'm pretty sure this one is in the fusebox that's inside the car. Even if you think the fuse is good, temporarily "borrow" a fuse from another non-essential location to make sure.
If you replace the fuse and everything works, then you should be all set. If the fuse blows a second time, you'll need to go over your install again.
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