2003 Lexus ES300 Trunk Release Wiring
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=143711
Printed Date: May 16, 2024 at 4:31 PM
Topic: 2003 Lexus ES300 Trunk Release Wiring
Posted By: mduong25
Subject: 2003 Lexus ES300 Trunk Release Wiring
Date Posted: November 02, 2017 at 12:01 PM
Installing a viper 4706v on a 2003 lexus es300, in the wiring diagram for trunk release it says to use the "5-wire" method. However I am trying to determine if the car has a negative or positive trunk polarity/release because there are diagrams for each type. Can someone help with this question and let me know how to wire this up?
Thank you,
Mike
Replies:
Posted By: kreg357
Date Posted: November 02, 2017 at 12:21 PM
Your Viper has only a (-) Trunk Release Output as shown below :
RED/WHITE (-) 200mA TRUNK RELEASE OUTPUT
The only info I can find for your 2003 ES300 is this :
TRUNK RELEASE WHITE/BLUE (5-WIRE) IN DRIVERS KICK PANEL
Here is a link to the relay wiring diagram from Bulldog Security :
https://diagrams.marktoonen.nl/DOWNLOADS/17044_ES300_5-WIRE%20TRUNK%20RELEASE%20DIAGRAM.pdf
A few notes :
You need a 30/40 Amp SPDT Bosch style relay with 5 wire harness.
You need an inline fuse holder with 10 Amp fuse.
You will use the top diagram. Your relay harness wire colors / positions will probably not match the diagram.
Basically it will go like this using relay pin numbers :
Relay Pin 85 to Viper RED/WHITE (-) 200mA TRUNK RELEASE OUTPUT
Relay Pins 86 and 87 to +12V constant through the 10 Amp fuse
Relay 87a to the cut WHITE/BLUE wire IN DRIVERS KICK PANEL going towards front of the car
Relay Pin 30 to the cut WHITE/BLUE wire IN DRIVERS KICK PANEL going towards rear of the car
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Soldering is fun!
Posted By: mduong25
Date Posted: November 02, 2017 at 1:51 PM
Thank you!
Posted By: howie ll
Date Posted: November 03, 2017 at 12:41 PM
1N4004 diode across 85 and 86, band to 86.
Or say goodbye to the 24 pin plug on the Viper.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: mduong25
Date Posted: November 03, 2017 at 4:45 PM
howard, if you are using a diode from 85 to 86, which is a negative to a constant power source....is that going to be a problem? I don't understand much about diodes...so i apologize in advance. thank you. According to the diagram...i am fusing 86&87 with 12v constant and 85(-) is the trunk wire from the unit.
Posted By: howie ll
Date Posted: November 03, 2017 at 5:04 PM
The diode stops back feed, around 200 volts when the relay shuts down, it can destroy the circuits above, also known as a quenching diode.
Well worth spending a few cents.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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