iSimple ISTY531

Dual Auxiliary Audio Input Interface with Complete Vehicle Harness for Select 2004-2011 Lexus, Scion, and Toyota Vehicles

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List price $129.95

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Product Features:

  • Integrates two auxiliary audio sources directly to the factory radio for the best sound quality
  • Plug and play installation maintains factory wiring integrity
  • Two separate inputs, RCA and 3.5mm minijack, for use with multiple audio sources
  • Retains factory-installed satellite radio, if vehicle is Satellite radio ready
  • Ideal for mp3 players, portable DVD players, handheld GPS, laptops, and gaming systems
  • Compatible with select Lexus, Scion and Toyota vehicles
  • 1-year Manufacturer's warranty

Vehicle Compatibility:

  • Lexus:
    • 2004 - 2006 ES 300
    • 2004 - 2006 ES 330
    • 2007 - 2009 ES 350
    • 2006 GS 300
    • 2007 - 2009 GS 350
    • 2006 - 2007 GS 430
    • 2007-2008 GS 450h
    • 2008 GS 460
    • 2007 - 2009 GX 470
    • 2006 - 2009 IS 250
    • 2006 - 2009 IS 350
    • 2008 - 2009 IS F
    • 2005 - 2007 LS 430
    • 2007 - 2009 LS 460
    • 2007 - 2008 LS 600h
    • 2007 - 2009 RX 350
    • 2007 - 2009 RX 400h
  • Scion:
    • 2005 - 2009 tC
    • 2006 - 2007 xA
    • 2006 - 2008 xB
    • 2007 - 2008 xD
  • Toyota:
    • 2007 - 2011 4 Runner
    • 2007 - 2011 Avalon
    • 2007 - 2011 Camry
    • 2007 Camry Solara
    • 2009 - 2010 Corolla
    • 2009 - 2010 FJ Cruiser
    • 2007 - 2011 Highlander
    • 2007 Land Cruiser
    • 2009 - 2010 Matrix
    • 2007 - 2010 Prius
    • 2007 - 2011 Rav4
    • 2007 - 2008 Sequoia
    • 2008 - 2011 Sienna
    • 2006 - 2011 Tacoma
    • 2007 - 2011 Tundra
    • 2009 - 2010 Venza
    • 2009 - 2010 Yaris

Product History:

iSimple ISTY531 thumbnail
(newest, current model)
PAC aPAC-TOY1 thumbnail
(previous model, replaced by iSimple ISTY531)

General Features

Type of Factory Radio Improvement Harness
This denotes whether the factory radio improvement module is an add-on tuner for an existing receiver, an FM stereo modulator, a plug-n-play installation harness, or if it is a portable module by itself.
Provides a Charge
This means that the cable will provide a charge to the iPod or iPhone while it is connected. On some cables that provide a charge, a power and ground connection will be required.
Factory Radio Improvement Features
This explains what exactly the unit integrates into your factory stereo. Some kits integrate many different features into your factory radio, while others add only one or two features to your existing factory stereo.
Provides Auxiliary Input
Number of Device Connections
This feature tells you how many devices you can connect to the unit at the same time. For example, some units allow you to connect an auxiliary input and an iPod/iPhone connection at the same time!
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Lexus ES300
Lexus ES350
Lexus GS300
Lexus GS350
Lexus GS430
Lexus GS450H
Lexus GX470
Lexus IS250
Lexus IS350
Lexus LS430
Lexus LS460
Lexus RX350
Lexus RX450H
Scion TC
Scion xA
Scion XB
Scion xD
Toyota 4Runner
Toyota Avalon
Toyota Camry
Toyota Corolla
Toyota FJ Cruiser
Toyota Highlander
Toyota Land Cruiser
Toyota Matrix
Toyota Prius
Toyota RAV4
Toyota Sequoia
Toyota Sienna
Toyota Tacoma
Toyota Tundra
Toyota Venza
Toyota Yaris

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


milpitas, CA

Totally worth it

April 17, 2012

I could not believe how easy this was to install, its just plug n play. the aux cord is insanely long so people in the back seats and use it to.

I have a 2004 Lexus ES330 with the navigation and ML (mark levinson) premium sound system and 6 disk cd changer... yeah, its hard to find things that adapt to all of this, i can still use everything to and it adds an extra feature on my screen for AUX. damn cool device.

20 of 24 found this helpful

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Lexus Owner


Worked Perfect. Highly recommend.

February 24, 2013

I own a 2004 Lexus ES330ES with Mark Levinson audio. I installed by going to YouTube to get an idea of Lexus radio installations. A clip did break when I installed, but that's about it. I took my time and it took about 45 minutes. I ran the two aux plugs - one in my glove box and the other in the armrest. Now I can listen to my mp3 or IPod with great quality. Great product.

13 of 17 found this helpful

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Accessory Tools and Products

Accessories added

Five Piece Installer's Panel Removal Tool Kit

Helps with removing dash and trim panels during car stereo installation.

Your Price $11.99

Scosche TK12 Car Stereo Installation Kit

Includes panel removal tool, wire cutter/stripper, test light, RCA cable runner, screwdriver, and more!

Your Price $14.99

Browse 4 questions and 4 answers
Hide answersShow all answers | Sort by
Will this work in a 2004 Lexus RX 330, without navigation screen or SAT Radio or SAT button?
David D on Dec 15, 2014
Best Answer: Hello David,

This unit will not work. Radio must have an "AM-SAT" "DISC" or "CD" button to be compatible. Unfortunately, there are no immediate solutions for your vehicle. We encourage you to contact Pac-Audio, link below, to explore your options.
Reply · Report · Sonic Electronix SStaff on Dec 16, 2014
· Add Answer · I Have This Question Too (0)
I have a 2004 Lexus ES330 with navigation. Will this be a good solution to connect an outside source? Any problems with the quality of the ISTY531 versus the cheaper aux connectors?
A shopper on Nov 8, 2014
Best Answer: Hello,

This would be a good solution. However, although the manufacture does not limit "Nav Equipped Vehicles", there are a few other compatibility specs that must be followed. Please use the link below for details.
Reply · Report · Customer SStaff on Nov 8, 2014
· Add Answer · I Have This Question Too (0)
Will this work to replace the amplifier (86280-76010 Panasonic 2) of a Lexus CT200h? If so, will you assist with installation instructions? Thanks!
Frank S on Oct 2, 2014
Best Answer: Hello Frank,

The ISTY531 is meant to Integrate Two Auxiliary Sources into the existing Audio System. It is Not intended to replace anything, especially not an amplifier. Unfortunately, there currently is no Amplifier Bypass/Replacement kit we can offer. We recommend contacting a local installer for custom options.
Reply · Report · Customer SStaff on Oct 4, 2014
· Add Answer · I Have This Question Too (0)
Does this work with navigation in a 2007 RX350?
A shopper on Aug 5, 2014
Best Answer: Hello,

We had to email the manufacture, and this was the response we got;

yes the ISTY531 should be compatible with your vehicle.

You might have to install it in the CD changer mode if your radio is not satellite ready however it should be.


Clifton Brown

Technical Support:
866-931-8021Call: 866-931-8021
Mon-Thurs 9am-7pm EST
Friday 9am-6pm EST
Sat 9am - 7pm EST
Reply · Report · Customer SStaff on Aug 12, 2014
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number




Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: iSimple ISTY531

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iSimple ISTY531

Dual Auxiliary Audio Input Interface with Complete Vehicle Harness for Select 2004-2011 Lexus, Scion, and Toyota Vehicles


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