2003 Ford Crown Victoria
2003 Mercury Grand Marquis

Item
Wire Color
Polarity
Location
Notes
+12V
Yellow
+
Ignition Switch Harness
Fused at 30 Amps
+12V
Light Green
+
Ignition Switch Harness
Fused at 50 Amps
+12V
Brown
+
Ignition Switch Harness
Fused at 50 Amps
Ignition 1

Fuel delivery and ignition systems, transmission controls, instrument cluster
White/Yellow
+
Ignition Switch Harness
Hot with key in the "run" and "start" positions
Ignition 2

Climate control blower motor, blend door,  A/C cycle switch
Gray/Yellow
+
Ignition Switch Harness
Hot with key in the "run" position only. Not powered with key in the "start" position.

Use an external relay due to high current draw
Ignition 3

Alternator charge indicator, Airbag Module, Antilock brakes
Pink/Black
+
Ignition Switch Harness
Hot with key in the "run" position only. Not powered with key in the "start" position.

Engine will run without powering this wire, but the alternator will not charge and the antilock brakes will not function properly
Accessory 1

Radio, Power windows, Windshield wipers
Black/Light Green
+
Ignition Switch Harness
Hot with key in the "run" or "accessory" positions. Not powered with key in the "start" position.

Do not need to apply power to this wire during remote starting.
Starter
Red/Light Blue
+
Ignition Switch Harness
Hot with the key in the "start" position only.
Power Door Locks (Lock)
Pink/Yellow

Behind Glovebox or in Drivers Door Harness
Vehicles without factory keyless entry such as police interceptors are five wire ground at rest reverse polarity.

Cars with factory keyless entry are positive trigger (+).
Power Door Locks (Unlock)
Pink/Light Green

Behind Glovebox or in Drivers Door Harness
Vehicles without factory keyless entry such as police interceptors are five wire ground at rest reverse polarity.

Cars with factory keyless entry are positive trigger (+).
Parking Lights
White/Black
-
At LCM or at Headlight Switch

Headlights
Red/Yellow
-
At LCM or at Headlight Switch

Courtesy Lights
Black/Light Blue
+
At LCM

Igntion Key Warning
Black/Pink
-
At LCM
Supplies a ground path to the LCM when the ignition key is in the lock cylinder. Note that cutting this wire will not disable the warning buzzer tone when the key is in the accessory position and the drivers door is opened
Door Trigger
Dark Blue &
Black/Orange
-
At LCM or Behind Drivers Kickpanel
Diode isolate the two wires. The blue wire is for the drivers door, the black/orange for the remaining three passengers doors.
Neutral Safety



Park neutral switch is located on the transmission and electrically opens the starter circuit unless the gear selector is in park or neutral
Horn
Dark Blue
-
At base of steering column or at lcm
Grounding this wire sounds the horn
Trunk Ajar
Brown/White
-
At LCM
Provides a ground path when the trunk is ajar
Trunk Release Solenoid
Purple/Yellow
+
Behind drivers kickpanel or in bundle of wires above drivers rocker panel
On vehicles equipped with the factory keyless entry system, the trunk release actuator lead rests at ground, so an spdt relay must be used.
Reverse Lights
Black/Pink
+
Behind drivers kickpanel or in bundle of wires above drivers rocker panel

Tachometer


At COP assembly or at PCM
There is no true tachometer source on 98'-02' crown victorias. But using one of the coil on plug ignition coils signal wires will be acceptable for most recent remote starters. There are two wires on each coil, one is a constant +12V source Red/Light Green, the other is the pulsed ground signal wire.

If a true tachometer source is needed, an aftermarket "tach adapter" can be installed.
Brake Light Switch
Light Green
+
At brake light switch or behind drivers kickpanel or in bundle of wires above drivers rocker panel

Rear Window Defroster Switch
Dark Blue/Orange
-
At defroster switch or LCM
Supply a momentary ground pulse to engage the rear window defroster.
Rear Window Defroster Element Feed
Brown/Light Blue
+
At LCM or in bundle of wires above passengers rocker panel
Supply a continuous +12V to this wire to engage the rear window defroster. Bypasses the LCM timer all together and supplies +12V directly to the defroster elements.

Notes:

2003 Civilian crown victorias are PATS equipped, use the ford Securilock Kit #3 (Part Number 1L2Z-19G365-AB) or DEI 555U to termporarily bypass the antitheft system during remote starting. Police interceptors are not PATS equipped and do not require the securilock bypass kit.

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Questions or Comments?

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