90'-91' Ford Crown Victoria
90'-91' Mercury Grand Marquis

Item
Wire Color
Polarity
Location
Notes
+12V
Yellow
+
Ignition Switch Harness

Ignition 1

Fuel delivery and Ignition Systems, Instrument Cluster
Red/Light Green

OR

Brown/Pink
+
Ignition Switch Harness
Hot with key in the "run" and "start" positions

The Red/Light Green wire is hot in the run position. The Brown/Pink wire hot in the start postion. Both wires are spliced together after the ignition switch so that the output is hot in both the run and start positions.
Ignition 2

A/C cycle switch, Airbag Module, Turn Signal and Backup Lamps, Air Supension, Heated Windshield, Oxygen Sensor Heaters
Gray/Yellow
+
Ignition Switch Harness
Hot with key in the "run" position only. Not powered with key in the "start" position.

Ignition 3

Climate control blower motor

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
Accessory 1

Radio, Power Windows, Windshield Wipers, Power Antenna
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
White/Pink
+
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 negative 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 negative trigger (-).
Parking Lights
Brown
+
At Headlight Switch or Behind Drivers Kickpanel

Headlights
Red/Yellow
+
At Headlight Switch
High current flow. Red/yellow wire connects to the headlamp bulbs. Black/Orange wire on the headlamp switch is a constant +12V source.
Door Trigger
Black/Light Blue
+
At underdash courtesy bulbs or at headlight switch or at door jamb switch

Igntion Key Warning
Black/Pink
-
At warning buzzer or at base of steering column
Supplies a ground path to the warning buzzer module when the ignition key is in the lock cylinder.
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
Yellow/Light Green
-
At base of steering column
Grounding this wire sounds the horn
Trunk Release Solenoid
Purple/Yellow
+
At Switch
Applying +12V to this wire opens the trunk
Reverse Lights
Black/Pink
+
Behind drivers kickpanel or in bundle of wires above drivers rocker panel

Tachometer
Tan/Yellow

At Ignition Coil

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



The rear window defroster timer is integrated into the switch assembly. To engage the timer from a momentary output of an alarm, disassemble the switch and solder two wires to the circuit board where the push button contacts connect. Then use an additional relay to emulate the button being depressed.
Rear Window Defroster Element Feed
Gray/Yellow
+
At defrost switch
To bypass the factory timer module all together and supply +12V directly to the defroster elements, use a latching output of the remote start module to drive a relay that connects the Yellow wire (constant +12V) with the Gray/Yellow wire on the defrost switch.

There are multiple gray/yellow wires in the ignition switch harness. To determine which wire is for the climate control blower motor and which is for the turn signal: strip some insulation off the yellow wire and gray yellow wires in the ignition switch harness. Then set the fan speed to high and push the turn signal lever downwards to engage the left turn signal, use a jumper wire to temporarily connect the yellow with each of the gray/yellow wires individually. When the turn signal starts blinking, you've found the ignition 2 circuit. When the blower motor starts spinning, you've found the ignition 3 circuit.

Since the operator is not physically present inside the vehicle when remote started to depress the accelerator pedal, to install a remote starter into a carberated vehicle one would need to add additional parts to actuate the throttle linkage while taking appropriate precautions that the setup did not cause linkage to bind during normal vehicle operation. Additionally, carberated vehicles tend to run rich mixtures at idle compared to their fuel injected counterparts. Which means that if you use the remote start feature frequently on a carberated vehicle, you'll also be spending significantly more money at the gas station for fuel.

Return to the Remote Start Installation Page

Questions or Comments?

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