Updated: 06/26/2024 • Published: 10/31/2007
The Modified Life staff has put their heads together to create an invaluable resource containing car alarm wiring diagram, remote car starter wiring diagram, car wiring diagram and car security wiring diagram. Feel free to use any car alarm wiring diagram or remote car starter wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind and most diagrams listed on our site are submitted by our Modified Life community. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1998 Lexus GS300. If you can’t find your car alarm wiring diagram or remote start wire diagram on Modified Life, please feel free to post a car wiring diagram request (Car Alarm Wiring Diagram Request Page) and we’ll do our best to find you the information you need for your mobile installation. If you would like to help the Modified Life community by adding a car alarm wiring diagram or auto alarm wiring diagram to our resource, please feel free to email us using our contact form. 1998 Lexus GS300 Car Alarm Wiring Diagram Information Constant 12V+ Wire: White/Blue Starter Wire (+): Black Second Starter Wire (+): N/A Ignition Wire (+): Black/Yellow Second Ignition Wire: Black/White Accessory Wire: Blue/Yellow Second Accessory Wire: N/A Key Sense Wire (+): N/A Tachometer Wire: Black/Yellow Door Lock Wire (-): Light Green/Black Door Unlock Wire (-): Light Green/Red & Gray Door Trigger Wire (-): Green Dome Supervision Wire: Green Headlights Wire (-): Red/Black Parking Light Positive Wire (+): Green Parking Light Negative Wire (-): Red/Yellow Trunk/Hatch Pin Wire (-): Red/White Hood Pin Wire (-): Violet/Green Trunk/Hatch Release Wire (+): Violet/Yellow or Blue Factory Alarm Arm Wire: Arms with Lock. Factory Alarm Disarm Wire (-): Disarms with Unlock. Factory Alarm Disarm but No Unlock Wire (-): Light Green/Black Horn Trigger Wire (-): Green/Black Brake Wire (+): Green/White Emergency Parking Brake Wire (-): N/A
Whether your an expert installer or a novice enthusiast with a 1998 Lexus GS300, an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car alarm, remote car starter, car security system or any mobile electronics is identifying the correct wires for a 1998 Lexus GS300.
Constant 12V+ Wire Location: Ignition Switch Large Harness
Starter Wire Location: Ignition Switch Harness
Start Wire Location: N/A
Ignition Wire Location: Ignition Switch Harness
Second Ignition Wire Location: Ignition Switch Harness
Accessory Wire Location: Ignition Switch Harness
Accessory Wire Location: N/A
Key Sense Location: N/A
Tachometer Wire Location: 28 pin plug, pin #16. Located inside ECU box which is under hood on the drivers side.
Door Lock Wire Location: In drivers door only multiplex locks.
Door Unlock Wire Location: Use both wires (2 pulse unlock).
Door Trigger Wire Location: To beat the dome light delay, go to each door module located in each door. The wires are : red/white for drivers door, red/green for front right door, red/white for left rear door, and red/yellow for right rear door. Dome light supervision wire is located in a 25 pin plug pin #13 behind the fuse panel in the passenger kick at the body ECU.
Dome Supervision Wire Location: To beat the dome light delay, go to each door module located in each door. The wires are : red/white for drivers door, red/green for front right door, red/white for left rear door, and red/yellow for right rear door. Dome light supervision wire is located in a 25 pin plug pin #13 behind the fuse panel in the passenger kick at the body ECU.
Headlights Wire Location: Under Steering Column
Parking Light Positive Wire Location: Bottom right of fuse panel.
Parking Light Negative Wire Location: Under Steering Column
Trunk/Hatch Pin Wire Location: Drivers kick panel in 20 pin plug.
Hood Pin Wire Location: Passenger kick panel in 25 pin plug.
Trunk/Hatch Release Wire Location: Violet/yellow(-) is at the switch or the blue(+) at the drivers kick in a 18 pin plug.
Factory Alarm Arm Wire Location: N/A
Factory Alarm Disarm Wire Location: N/A
Factory Alarm Disarm Wire Location: Drivers kick in 18 pin plug.
Horn Trigger Wire Location: Steering Column. Horn is a green/black in a blue 13 pin plug in the drivers kick.
Brake Wire Location: Drivers kick panel in 20 pin plug.
Emergency Parking Brake Wire Location: N/A