2003 Ford Expedition Car Alarm Wiring Diagram

Whether your an expert installer or a novice enthusiast with a 2003 Ford Expedition, 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 Ford Expedition.

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 2003 Ford Expedition.

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2003 Ford Expedition Car Alarm Wiring Diagram Information

Constant 12V+ Wire: Green/Purple
Constant 12V+ Wire Location: Ignition Switch Large Harness

Starter Wire (+): Pink/Light Blue
Starter Wire Location: Ignition Switch Harness

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

Ignition Wire (+): Blue/Light Green
Ignition Wire Location: Ignition Switch Harness

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

Accessory Wire: Black/Green
Accessory Wire Location: Ignition Switch Harness

Second Accessory Wire: Black/Green
Accessory Wire Location: Ignition Switch Harness

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

Tachometer Wire: Tan
Tachometer Wire Location: The tach wire on the 4.6L go to any of the 8 ignition coils and use the wire that is not Red/Green. The tach wire on the 5.4L is a Light Green/White at the coil on the passenger side of the motor between the fuel injectors.

Door Lock Wire (-): Pink/Yellow
Door Lock Wire Location: Keyless Module. The keyless module is located high in the drivers kick against the firewall.

Door Unlock Wire (-): Pink/Green
Door Unlock Wire Location: Keyless Module. The keyless module is located high in the drivers kick against the firewall. The GEM in this vehicle shuts down after the doors have been locked for a certain time period.

Door Trigger Wire (-): Light Blue/White. One of two. The wire is in pin 11 and it is next to the Black/Pink wire. Test with a digital multi-meter ONLY, to keep from damaging the circuit tied into the other Light Blue/White.
Door Trigger Wire Location: At Keyless Module. The keyless module is located high in the drivers kick against the firewall.

Dome Supervision Wire: Black/Light Blue
Dome Supervision Wire Location: Passenger Kick Panel

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

Parking Light Positive Wire (+): Brown
Parking Light Positive Wire Location: Headlight Switch

Parking Light Negative Wire (-): N/A
Parking Light Negative Wire Location: N/A

Trunk/Hatch Pin Trigger Wire (-): Tied in with the doors.
Trunk/Hatch Pin Trigger Wire Location: N/A

Hood Pin Trigger Wire (-): N/A
Hood Pin Trigger Wire Location: N/A

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

Factory Alarm Arm Wire: N/A
Factory Alarm Arm Wire Location: N/A

Factory Alarm Disarm Wire (-): N/A
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 (-): Dark Blue
Horn Trigger Wire Location: Steering Column

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

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

Make Your Car Alarm Installation Easy with these Tools and Accessories

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