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Car Alarm Wiring Diagram and Car Wiring Diagrams – 2003 Lexus ES300

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Whether your an expert installer or a novice enthusiast with a 2003 Lexus ES300, 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 2003 Lexus ES300.

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. 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 2003 Lexus ES300.

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.

2003 Lexus ES300 Car Alarm and Remote Car Starter Wiring Information

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

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

Second Starter Wire (+): Green/Yellow
Start Wire Location: Ignition Switch Harness

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

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

Accessory Wire: Blue
Accessory Wire Location: Front of Fuse Box

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

Tachometer Wire: Black/Orange
Tachometer Wire Location: Pin 5, 31 pin plug @ ECM. The ECM (Engine Control Module) is behind the glove box.

Key Sense Wire: Blue
Key Sense Location: Ignition Switch Harness

Door Lock Wire (-): Blue/Yellow
Door Lock Wire Location: Driver door module in door.

Door Unlock Wire (-): Blue
Door Unlock Wire Location: Driver door module in door.

Door Trigger Wire (-): The driver door trigger is red/green at lower left of the fuse box. The passenger door is red/green at upper left of the fuse box. The left rear door trigger is red/white, and the right rear is red/yellow, at the bottom of the fuse box. Use all four and diode isolate each.
Door Trigger Wire Location: N/A

Dome Supervision Wire: Comes on with unlock.
Dome Supervision Wire Location: N/A

Headlights Wire (-): N/A
Headlights Wire Location: N/A

Parking Light Positive Wire (+): Green
Parking Light Positive Wire Location: Bottom of fuse box.

Parking Light Negative Wire (-): Red
Parking Light Negative Wire Location: Headlight Switch

Trunk/Hatch Pin Wire (-): Green
Trunk/Hatch Pin Wire Location: Driver kick panel or light in trunk.

Hood Pin Wire (-): Black
Hood Pin Wire Location: Theft ECU behind glove box.

Trunk/Hatch Release Wire (-): White/Blue
Trunk/Hatch Release Wire Location: Driver kick panel. (The fuel door release is red/white (+) in the driver kick panel.)

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 (-): N/A
Factory Alarm Disarm Wire Location: N/A

Horn Trigger Wire (-): Green/Black
Horn Trigger Wire Location: Horn Switch in Steering Column

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

Parking Emergency Brake Wire (+): Red/White
Parking Emergency Brake Wire Location: Emergency Brake Switch

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