viper trunk release keeps popping fuse

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=113982
Printed Date: May 03, 2024 at 2:39 PM

Topic: viper trunk release keeps popping fuse

Posted By: kent4223
Subject: viper trunk release keeps popping fuse
Date Posted: May 23, 2009 at 10:16 PM

I have a Viper 5901 on an 09 Corolla. Alarm, doors, sensors, remote start all work perfect.
One major problem though...When I press the trunk release, the main fuse (12V supplying Viper unit and sensors) keeps popping. I have gone through 6 fuses now (used 15A, 20A & 30A-all popped!!!).

Trunk relay connections:
30 --- Output to trunk release wire (pink at driver's kick)
85 --- Viper trunk release wire (RED / white)
86 --- Fused +12V
87 --- Fused +12V input (trunk release is (+) polarity)
87a---Not used.

When I press trunk release on remote with pin 30 NOT connected to car, remote shows trunk release and passes 12V to pin 30. However, when I connect pin 30 to trunk release wire, fuse
on 12V wire pops. Just don't get it....

I have also tried connecting GND to pin 87, but trunk release doesn't work (wanted to confirm (+) trunk polarity). Your input will be greatly appreciated. Thanks.

Replies:

Posted By: i am an idiot
Date Posted: May 23, 2009 at 10:24 PM

I have no idea what your problem is, but DO NOT try a larger fuse.

Posted By: tommy...
Date Posted: May 23, 2009 at 10:25 PM

Here's the same configuration showing a negative output from an alarm or remote keyless entry used to activate a trunk release solenoid that requires 12V+ to release the trunk. posted_image

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Posted By: kent4223
Date Posted: May 23, 2009 at 10:32 PM

Yup, I'll stick with 15A fuses.

Posted By: kent4223
Date Posted: May 23, 2009 at 10:34 PM

It shouldn't matter if I use pin 30 or pin 87 interchangeably...or should it?

Posted By: tommy...
Date Posted: May 23, 2009 at 10:59 PM

Did it pop first time it was used...Are you sure it is + trigger ...Black to ground...Red to pink wire in DKP...then pressed trunk-pop when you tested the wire...It showed 12v...?

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Posted By: kent4223
Date Posted: May 23, 2009 at 11:08 PM

It popped the very first time I tried to use it. I did probe the car trunk release and it showed 12V when I opened trunk using factory key. I also placed an LED on the car's trunk release wire, and grounded the other LED terminal; the LED lit up when trunk opened.

Maybe I have the wrong wire! But according to the DEI wiring reference for 09 Corolla, trunk release wire is PINK at dkp...

Posted By: i am an idiot
Date Posted: May 23, 2009 at 11:17 PM

30 and 87 are interchangeable when using the relay as a Single pole single throw device. If you were using it as a Single pole double throw device, 30 is the common connection. 30 is connected to either 87 or 87A, depending on the state of the relay, energized, or at rest.

Posted By: howie ll
Date Posted: May 24, 2009 at 2:25 AM

Don't know whether I'm being silly or not thinking here but hows about a diode across 85 and 86, also never known a trunk release solenoid to pull more than 12amps. Also, could one have a faulty relay, know it's unlikely, also use a power supply for that relay separate to the alarm's, then you won't blow the main fuse each time, also try wiring the relay like this:- 85, 86 and 87 as before, wire from DKP to 87a, wire to trunk release from 30.

Posted By: kent4223
Date Posted: May 24, 2009 at 6:24 AM

Do not have an external power supply, but your idea (Howie II) to isolate the car's trunk

release wire through the relay 87a (like IGN 2) just might work. I'll keep you posted.

Thank you all for the input.

Posted By: tommy...
Date Posted: May 24, 2009 at 9:39 AM

I think he means use a separate power source ...Meaning where did you get 12 volts for relay...?But i did just wake up and i havent had a cup of coffee yet...

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

Posted By: i am an idiot
Date Posted: May 24, 2009 at 9:45 AM

Is this a trunk release or a lock and unlock solenoid, such as a door lock and unlock? If it is lock and unlock, it could be a reversal rest at ground setup. Try cutting that wire, and connecting your wire to the end of it that goes to the solenoid. If it works with the alarm now, we will have to draw you a new diagram for your relay. Let me know if it works now. And remember DO NOT use a larger fuse.

If it works with the alarm, wire the relay as follows. Power to 86 and 87. Alarm wire to 85. The wire you cut goes as follows. 30 goes to the solenoid. 87A goes to the car end of that wire.

Posted By: simplyfalling
Date Posted: May 24, 2009 at 9:48 AM

isnt it 5 wire like other toyotas?

Posted By: kent4223
Date Posted: May 24, 2009 at 11:11 AM

It is a 5 wire trunk release motor (09 Corolla). It finally worked when I isolated the trunk release wire through the relay.

30 --- Trunk release (car motor side)
85 --- (-) alarm input
86 --- Fused 12V
87 --- Fused 12V
87a---Trunk release (car switch side)

Seems like the car's trunk release switch rests at GND and you cannot apply 12V directly to the trunk release, hence all the popped fuses. You have all been very helpful. Big thanks.

Posted By: howie ll
Date Posted: May 24, 2009 at 11:18 AM

Wait a minute, I've solved someone else's problem without thinking and we haven't even had Corollas in Europe for 3 years (it's called the Auris) I'm bad. (And no false modesty)