2001 lexus rx300, firewall

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Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=80413
Printed Date: October 08, 2025 at 4:58 PM

Topic: 2001 lexus rx300, firewall

Posted By: 92chb
Subject: 2001 lexus rx300, firewall
Date Posted: July 17, 2006 at 5:34 PM

Long time reader, first time poster. Great Website by the way. I need help finding a hole in the firewall of a 2001 Lexus RX300 to run a 4 gauge wire through. My customer would rather not have me drill a hole in the firewall unless it is 100% neccessary for the installation.

Also I need to tap into the rear speaker wires for an amp interface adapter. I have searched and only come up with wire codes for an IS300 and i would like to make sure that the color codes are the same, along with the factory amp location(passenger upper kick panel).

Thankyou for any help.

Replies:

Posted By: pmh61
Date Posted: July 21, 2006 at 3:56 AM

     WIRE          COLOR          POLARITY          LOCATION
     Battery          WHITE/ YELLOW          (+)          RADIO HARNESS
     Accesory          WHITE/ RED          (+)          RADIO HARNESS
     Ground          BLACK          (-)          RADIO HARNESS
     Illumination          RED / BLACK          (+)          RADIO HARNESS
     Dimmer          RED          (-)          RADIO HARNESS
     Power Antenna          YELLOW/WHITE          (+)          RADIO HARNESS
     Amp Turn On          YELLOW/WHITE          (+)          RADIO HARNESS
     LF Speaker (+)          WHITE
     LF Speaker (-)          ORANGE
     RF Speaker (+)          YELLOW
     RF Speaker (-)          BROWN
     LR Speaker (+)          RED
     LR Speaker (-)          GREEN
     RR Speaker (+)          BLUE
     RR Speaker (-)          BLACK
     Amp Location          MOUNTED TO BRACKET IN RIGHT SIDE OF TRUNK
     Steering Cntrls          YES
               THIS VEHICLE MAY BE EQUIPPED WITH OPTIONAL ONSTAR® TELEMATICS EQUIPMENT. USE AN APPROPRIATE INTEGRATION HARNESS OR INSTALLATION PROCEDURE TO ENSURE PROPER FUNCTION OF THIS EQUIPMENT.
     Speed Cntrl          NO
     Radio Security          YES

Posted By: 92chb
Date Posted: July 21, 2006 at 3:22 PM

Thanks man that helps alot! Anyone have ideas on a hole in the firewall? I have heard something about a hole near the brake pedal.