Lost power for Constant 12v

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=85302
Printed Date: May 14, 2025 at 1:52 PM

Topic: Lost power for Constant 12v

Posted By: jzlitao
Subject: Lost power for Constant 12v
Date Posted: November 07, 2006 at 6:29 PM

I was installing a Viper 791xv on 2004 Camry and was following the manul to install a relay for trunk release. Sth maybe wrong with my wiring , when I pressed the remote, I only heard a switch connected sound from relay and nothing happen to my trunk release and now I lost power of constant 12v on ignition harness, which is also the power of 791xv. Can anyone tell me what is wrong with my power? I can still release my trunk with factory remote and listen cd but can not start my car. No power now.

Many thanks!!

Replies:

Posted By: Twelvoltz
Date Posted: November 07, 2006 at 7:00 PM

Sounds like you fried the fuse supplying your constant hot for the ignition harness. Check the power distribution box, normally located under the hood.

Posted By: jzlitao
Date Posted: November 07, 2006 at 7:06 PM

Your are right, checked the fuse under the hood and found the 8th one was blowed out. Thanks.

Posted By: Twelvoltz
Date Posted: November 07, 2006 at 7:18 PM

Make sure you fix the short that caused it to blow in the first place before replacing the fuse, as it will just blow again unless repaired.

Posted By: ferretvw
Date Posted: November 08, 2006 at 12:40 AM

What is most likely happening is a trunk solenoid takes quite a bit of power to pop and that ignition harness wire is not substantial enough to supply it, best bet would be to get the power off the battery fused of course and a proper gauge wire. Had the same problem with a Scion Xb and just ran a 12 or 14 gauge wire from the battery for constant.

-------------
2008 Scion xB
Pioneer AVIC-D3
RF 3Sixty.2 sound processor
Stock speakers (for now ;))