Whether your an expert installer or a novice enthusiast with a 2002 Lexus RX300, 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 2002 Lexus RX300.

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 2002 Lexus RX300.

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.

2002 Lexus RX300 Car Alarm Wiring Diagram Information

Constant 12V+ Wire: White/Blue
Constant 12V+ Wire Location: Ignition Switch Large Harness

Starter Wire (+): Black/White
Starter Wire Location: Ignition Switch Harness

Second Starter Wire (+): N/A
Start Wire Location: N/A

Ignition Wire (+): Black/Yellow
Ignition Wire Location: Ignition Switch Harness

Second Ignition Wire: Black
Second Ignition Wire Location: Ignition Switch Harness

Accessory Wire: Pink
Accessory Wire Location: Ignition Switch Harness

Second Accessory Wire: N/A
Accessory Wire Location: N/A

Key Sense Wire (+): N/A
Key Sense Location: N/A

Tachometer Wire: Orange
Tachometer Wire Location: Right of the fuse box in a 10-pin plug.

Door Lock Wire (-): Pink
Door Lock Wire Location: Harness between module and door actuator.

Door Unlock Wire (-): Pink/Blue & Gray
Door Unlock Wire Location: In Passenger’s Door.

Door Trigger Wire (-): Red/White
Door Trigger Wire Location: Left of steering black 13 Pin connector position 2.

Dome Supervision Wire: Same as door trigger.
Dome Supervision Wire Location: N/A

Headlights Wire (-): Red/Blue
Headlights Wire Location: Steering Column

Parking Light Positive Wire (+): Green
Parking Light Positive Wire Location: Drivers Kick Panel. This wire goes to the key cylinder illumination ring and reads the delay.

Parking Light Negative Wire (-): Green/Red
Parking Light Negative Wire Location: Steering Column

Trunk/Hatch Pin Wire (-): White/Red
Trunk/Hatch Pin Wire Location: Drivers Kick Panel. Located in a 20-pin plug, low in the kick panel. Test only with a digital multi-meter as some of the multiplex wires in the car are white/red.

Hood Pin Wire (-): Red/Blue
Hood Pin Wire Location: In the engine compartment, under the relay box on the drivers side in a gray 17-pin plug, pin #1.

Trunk/Hatch Release Wire (+): N/A
Trunk/Hatch Release Wire Location: N/A

Factory Alarm Arm Wire: Arms with Lock.
Factory Alarm Arm Wire Location: N/A

Factory Alarm Disarm Wire (-): Disarms with Unlock.
Factory Alarm Disarm Wire Location: N/A

Factory Alarm Disarm but No Unlock Wire (-): Blue/Silver Dots
Factory Alarm Disarm Wire Location: Steering Column. This is the ignition key sense wire. Using the status output wire from the remote start to ground.

Horn Trigger Wire (-): White/Red
Horn Trigger Wire Location: Steering Column

Brake Wire (+): Green/White
Brake Wire Location: Brake Pedal Switch

Emergency Parking Brake Wire (-): N/A
Emergency Parking Brake Wire Location: N/A