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Metra 70-7303

Wiring Harness for Select 2008-Up Hyundai/Kia Vehicles

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List price $29.99

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with warranty

Order within 17 hrs 31 mins to ship 10/24

Arrives by Monday, Oct. 31 to zip 94107

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Metra Audio Store

When replacing your factory radio with an after-market car stereo, the Metra 70-7303 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without the Metra 70-7303, you would have to cut the OE radio plug and manually test each wire to connect to your after-market receiver. In addition, because you do not have to cut your OE radio plug off, the Metra 70-7303 allows you to reinstall your factory receiver if necessary. A great example is if you sold your car, but wanted to keep your after-market radio and re-install your factory stereo receiver. We also recommend the Scosche BOBAZT for a quick connection that is sure to last.

Product Features:

  • Power/4-Speaker
  • Plugs into car harness at radio
  • One 16-pin plug and one 20-pin plug
  • Works with factory Infinity amplified systems
  • Compatible with select 2008-Up Hyundai/Kia Vehicles


  • Yellow – 12V Constant
  • Red – 12V Accessory
  • Black - Ground
  • Orange – Dash Light Dimmer/Illumination
  • Green – Left Rear Speaker (+)
  • Green with Black Stripe Left Rear Speaker (-)
  • White – Left Front Speaker (+)
  • White with Black Stripe – Left Front Speaker (-)
  • Purple – Right Rear Speaker (+)
  • Purple with Black Stripe – Right Rear Speaker (-)
  • Gray – Right Front Speaker (+)
  • Gray with Black Stripe – Right Front Speaker (-)

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Premium Sound
Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Connect/Install an Aftermarket Car Stereo
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
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.
Hyundai Elantra
Hyundai Genesis Coupe
Hyundai Sonata
Hyundai Tucson
Hyundai Veracruz
Kia Amanti
Kia Borrego
Kia Forte
Kia Optima
Kia Rio
Kia Sedona
Kia Sorento
Kia Soul
Kia Sportage

Premium Harness Features

Factory System Amplification
This refers to the factory sound system and whether the item is compatible with amplified or non-amplified systems.
Compatible Premium Audio Systems
Some vehicles have higher end audio systems installed in them by the manufacturer. This specifies which premium audio systems this item is compatible with.

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


Olympia, WA

Does not fit the car it's advertising

January 8, 2014

This harness did not fit our 2009 Hyundai Elantra as advertised. We have the 6 speaker system, and this harness looks absolutely nothing like the harness in the car.

The correct kit was the Metra 70-1004, which I ended up having to buy local for $25 when I could have had it included with the deck I purchased. I already had the car all torn apart by this point so I couldn't wait a week to get a new one shipped.

Very disappointing Metra. Fix your information as this does NOT work.

15 of 19 found this helpful

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Tampa, FL

fit OEM

October 26, 2011

Fit perfectly to OEM.

12 of 14 found this helpful

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Works... almost

December 9, 2013

Connector A (lower part of the black plug) misses a couple of pins namely pin 1 (Speed) and pin 7 (Illumination-). I am not sure what is the purpose of pin 7 (I have never seen a head unit that uses it) but pin 1 might or might not be a problem, depending on whether your head unit has some speed-dependent behaviour (if it does you won't be able to use this feature without pin 1).

Connector B (upper part of the black plug) is spot on, in the sense that it has all the pins (as it should).

Connector C (the red one) was very problematic for my vehicle (2011 Kia Sorento). Only pin 18 is present, supposedly for connecting to the steering wheel remote control. Problem is, in my vehicle the said remote control talks to pin 16 rather than pin 18. I had pull the pin out and re-insert it in the proper place (which is pretty hard to do if you do not want to damage the pin in the process, as I believe that you are not supposed to do this). In my application I also had to insert a new pin 17 (remote control GND), though in fairness I might have accomplished the same thing by grounding the GND wire of the remote control adapter elsewhere

Overall the adapter almost works as advertised, but does require some work to make it behave. One should nonetheless be aware that some tweaking is probably necessary to make this adapter work.

10 of 12 found this helpful

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Spokane, WA

Good product

July 30, 2012

Good product easy enough to use and good price. Easy install

10 of 12 found this helpful

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gorham, me

No + Illumination

February 6, 2011

This is a well made plug, but it's missing the + Illumination wire. I used it to connect a "radio ready" 2011 Accent to a 2008 Hyundai radio (M455) and noticed that the +Illumination wire is on the 2011 harness, but missing on the 70-7303. Since I don't have a power antenna, I moved that wire in the plug over to the +Illumination spot and it worked.

(For the rating, I just think that all of these plugs are over priced. Just my opinion.)

11 of 14 found this helpful

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Hagerstown, MD


December 23, 2010

Really made the job easy!! Received with my radio as a free be !!

11 of 14 found this helpful

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Huntsville, AL

Verified Purchase
Great service wrong product

March 18, 2016

Ordered this for 2014 elantra and it didn't fit even tho it said it would!

0 of 0 found this helpful

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Verified Purchase
Adapter works well but missing important wires

December 21, 2015

This adapter harness works well.
Only really frustrating thing is 2 of the connectors on the adapter are missing important wires that are required when connecting an advanced head unit like the Pioneer AVIC-8100NEX

See missing pins and wires here:
I highlighted them in yellow.

A-1 - Speed
C1-1 - Bluetooth Mic +
C1-2 - Bluetooth Mic -
C2-1 - Aux Right
C2-2 - Aux Left
C2-3 - Aux Ref (shield)
C2-5 - Steering Wheel Remote
C2-6 - Steering Remote GND
C3-2 - USB -
C3-4 - USB +
C3-5 - USB GND
C3-7 - USB +5V

0 of 0 found this helpful

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Items we think you might want
Scosche BOBAZT Stereo Connector Kit

• Designed to connect in-dash receiver wiring harness to vehicle wiring harness

Your Price $4.99

Browse 3 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
To adapt the wiring harness in my 2008 kia sorento to the back of my head unit.
James E on Sep 12, 2016
it's hard to find the correct wiring harness ....and you have it in stock and it's cheaper than everywhere i've looked to buy it
Todd A M on Dec 25, 2015
need to install
Ricardo P on Jul 24, 2016
I have a 2011 Hyundai Genesis Coupe 2.0 base, and I'd like to hook up a subwoofer to my stock sound system, but I do not want to replace the headunit or speakers. I like the factory radio and speakers, i just need to be able to run an amp and subs to my factory radio. is this what i need?
Jack C on Jan 11, 2016
Best Answer: Hi Jack,

No, far from it. This Metra 70-7303 is to replace the OEM Radio. What you seek is called a Line Out Converter. Two examples on both extremes (i.e. Good vs Best) are linked below. We can't answer which will work best for you, as that all depends on you, your install and/or installer.
Reply (1) · Report · Rick MStaff on Jan 11, 2016
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Will this fit a 2009 Elantra with standard single in-dash cd/radio 4-speaker non-amplified system? I've heard it won't.
A shopper on Jan 11, 2015
Best Answer: Hello,

We looked into your concern, but have not established any pattern of issues with the harness. In fact, its the Only one offered by Metra. We went a step further and checked with a few of our friends & competitors, but came up with the same answer, this harness .

Furthermore, the 'alternate' is only offered by Scosche, and its essentially the same plug; Scosche HY10B .

For Technical Support:
[email protected]
tel: 800.253.8324

[email protected]
tel: 800.363.4490 ext. 3
Reply · Report · Customer SStaff on Jan 11, 2015
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Product Summary


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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: Metra 70-7303