2003 F150 keyless problems

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=37506
Printed Date: July 17, 2025 at 9:19 PM

Topic: 2003 F150 keyless problems

Posted By: ucmwp
Subject: 2003 F150 keyless problems
Date Posted: August 16, 2004 at 3:50 PM

Hi, i'm installing a keyless entry and remote start in my 2003 f150. It came with factory keyless entry. when I connect the wires up to the relays for the 5 wire alternating system, the doors lock and unlock continously. Is this system not a 5 wire like I thought? Any thoughts?

Replies:

Posted By: raydawg357
Date Posted: August 16, 2004 at 3:54 PM

No this is not a 5 wire setup, it's only 5 wire without the factory keyless entry

FORD, F SERIES LIGHT DUTY, 2003, Power Lock

Negative pulse, type B, on keyless entry models. Five wire, type C, on non-keyless models, mastered from the driver switch.

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Do it right the first time

Posted By: SoundFX411
Date Posted: August 16, 2004 at 8:04 PM

That's right, it's a neg pulse circuit.

Lock----- Pink / YELLOW
Unlock--- Pink/light green
Located in the drivers kick panel

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