MODIFIEDLIFE

1990 Lexus LS400 Audio Wiring Guide

Modified Life is reader-supported. When you buy through links on our site, we may earn an affiliate commission. Learn how it works.


Question: Where can I find a 1990 Lexus LS400 stereo wiring diagram? What are the 1990 Lexus LS400 radio wiring harness colors?

If you’re looking to change the radio in your 1990 Lexus LS400 or troubleshoot why your car radio stopped working, we’re here to help!

Our comprehensive 1990 Lexus LS400 stereo wiring diagram shows you all the stereo wire harness colors, car speaker wiring colors and car speaker sizes. Use our 1990 Lexus LS400 stereo wiring guide to help you with your car radio and installation needs.

1990 Lexus LS400 Stereo Wiring Diagram

This 1990 Lexus LS400 stereo wiring chart shows you all the 1990 Lexus LS400 stereo wire colors and their functions. Utilize this guide to help you with a car radio install or help with a car radio troubleshoot. If you don’t see the car radio wiring information you’re looking for, please feel free to ask your question at the bottom of this page.

Application Radio Wire Color
Car Radio Battery Wire (Constant Power 12v+) N/A
Car Radio Accessory Wire (Switched Power 12v+) 10-Pin Main Plug, Pin #3
Car Radio Ground Wire 10-Pin Main Plug, Pin #7
arrow Use a Car Radio Wiring Harness and Car Radio Dash Kit for an Easy Install!
Car Radio Illumination Wire 10-Pin Main Plug, Pin #10
Car Stereo Dimmer Wire N/A
Car Radio Antenna Trigger Wire 10-Pin Main Plug, Pin #8
Car Radio Amp Turn-On Trigger Wire 10-Pin Main Plug, Pin #9
Car Radio Amp Mute Wire 6-Pin Bottom Plug, Pin #3
Car Radio Amplifier Location Car amplifier is located on the right side of the trunk.
arrow Use an Amp Integration Harness to Connect Your Factory Amplifier to an aftermarket radio.

1990 Lexus LS400 Speaker Wiring Guide

This 1990 Lexus LS400 speaker wiring chart shows you every speaker wire color and the speaker wire location. Use this 1990 Lexus LS400 speaker wiring guide to help you with a speaker replacement or speaker upgrade. If the car speaker wiring information you’re searching for is not listed, please don’t hesitate to ask for it at the bottom of this page.

Application Speaker Wire Color
Front Center Speaker Positive Wire (+) N/A
Front Center Speaker Negative Wire (-) N/A
arrow Upgrade your Center Speakers for awesome sound!
Front Left Tweeter Positive Wire (+) N/A
Front Left Tweeter Negative Wire (-) N/A
Front Right Tweeter Positive Wire (+) N/A
Front Right Tweeter Negative Wire (-) N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Front Left Speaker Positive Wire (+) 6-Pin Main Plug, Pin #2
Front Left Speaker Negative Wire (-) 6-Pin Main Plug, Pin #6
Front Right Speaker Positive Wire (+) 6-Pin Main Plug, Pin #1
Front Right Speaker Negative Wire (-) 6-Pin Main Plug, Pin #5
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Left Tweeter Positive Wire (+) N/A
Rear Left Tweeter Negative Wire (-) N/A
Rear Right Tweeter Positive Wire (+) N/A
Rear Right Tweeter Negative Wire (-) N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Rear Left Speaker Positive Wire (+) 6-Pin Main Plug, Pin #2
Rear Left Speaker Negative Wire (-) 6-Pin Main Plug, Pin #6
Rear Right Speaker Positive Wire (+) 6-Pin Main Plug, Pin #1
Rear Right Speaker Negative Wire (-) 6-Pin Main Plug, Pin #3
arrow Upgrade your Subwoofer for deeper lows!
Subwoofer Positive Wire (+) 6-Pin Bottom Plug, Pin #2
Subwoofer Negative Wire (-) 6-Pin Bottom Plug, Pin #6

1990 Lexus LS400 Speaker Sizes and Location

This 1990 Lexus LS400 speaker size chart shows your speaker measurements and speaker locations. Use this chart to see what speaker fits in your 1990 Lexus LS400.

Application Speaker Size and Location
Front Center Speaker Size N/A
Front Center Speaker Depth N/A
Front Center Speaker Location N/A
arrow Upgrade your Center Speakers for awesome sound!
Front Tweeter Size N/A
Front Tweeter Depth N/A
Front Tweeter Location N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Front Speaker Size 5.25″ Speakers
Front Speaker Depth 3″ Depth
Front Speaker Location Front Doors
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Tweeter Size N/A
Rear Tweeter Depth N/A
Rear Tweeter Location N/A
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Speaker Size 6.5″ Speakers
Rear Speaker Depth 3″ Depth
Rear Speaker Location Rear Deck
arrow Upgrade your Subwoofer for deeper lows!
Car Subwoofer Speaker Size N/A
Car Subwoofer Speaker Depth N/A
Car Subwoofer Speaker Location N/A

Questions and Answers

If you have any questions about your 1990 Lexus LS400 radio installation, please don’t hesitate to post them at the bottom of this page. We’re committed to finding the answers you need, and members of the Modified Life community may also provide valuable insights into the car stereo information you’re looking for. Don’t hesitate to ask your car audio question; it could benefit others seeking the same answers!

Contribute

Do you want to contribute 1990 Lexus LS400 stereo wire diagram information to benefit the Modified Life community? Feel free to share your insights by posting at the bottom of this page. We will gather any additional information presented below by our community, verify it, and incorporate it into the car radio wiring guide above for easy reference. We are consistently adding new information to improve and update this car stereo wiring guide as it becomes available. We appreciate your contribution in advance!

2 thoughts on “1990 Lexus LS400 Audio Wiring Guide”

  1. All questions pertain to 1990 Lexus LS400 v8 4.0 Sedan – (Sorry for all the questions but it’s been extremely tough to find correct answers for them.)

    1. Is there any aftermarket 8″ subwoofer that will fit directly into the rear center enclosure 1990 Lexus LS400 without any cutting or any modifications to the enclosure?
    2. What is the smallest speaker that will fit directly into the 8″ rear center subwoofer enclosure?
    3. The OEM pioneer tape player doesn’t work but the radio does & I want to avoid aftermarket receivers. Is it smart to replace it with another OEM pioneer or is it smarter to go aftermarket?
    Would it be ok if I installed an aux input adapter kit onto my oem receiver?
    4. My receiver is Pioneer w/o any cd controls w/o leather so does the OEM replacement need to match these specifications?
    5. Are there any Toyota or other model Lexus am/fm receivers that fit directly into my model? (excluding Nakamichi brand)

    can anyone help?

  2. I have a 1990 lexus ls400 with a Nakamichi premium sound system. Stereo works however the sound is VERY low. The temp.gauge for air/ clock is also out. I’m not sure where the amp is. Located and so I not sure where to even start looking.. Any help would be appreciated.

Leave a Comment

Your email address will not be published. Required fields are marked *