2001 pathfinder 451m relay
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=115974
Printed Date: May 12, 2025 at 8:03 AM
Topic: 2001 pathfinder 451m relay
Posted By: hitman1733
Subject: 2001 pathfinder 451m relay
Date Posted: August 28, 2009 at 10:21 PM
I had my factory keyless entry system go out on me so I decided to replace it with an aftermarket system. However I'm at a stand still. Can anyone help me with the DEI-451M relay for the Pathfinder. I'm not sure what wires to connect to, and what ohms to set for the diodes. I have figured out everything else, but what needs to be done for the relay. Thanks.
Replies:
Posted By: Chris Luongo
Date Posted: August 28, 2009 at 10:42 PM
Should be no need whatsoever for a 451M in that car, unless the factory power doorlocks have somehow been damaged.
What keyless entry system are you installing?
Posted By: hitman1733
Date Posted: August 29, 2009 at 8:29 AM
I am using an Omega REC-12. How would I bypass the factory system then? I think what might be throwing me off is that I say a similar install on autotoys.com and they showed the use of the 451M and some diodes. Hey maybe they were wrong, but then what color wires am I looking for to lock and unlock the doors? And what should be done to bypass the factory system? Thank you very much!!!
Posted By: howie ll
Date Posted: August 29, 2009 at 4:39 PM
I think Chris is telling you that the unit has at least neg lock outputs that should be able to control the pathfinder's lock triggers without the need for external relays or diodes. It's up to you to work this out from the provided installation notes, and to get the vehicle info from vehicle wiring on this website.
Posted By: hitman1733
Date Posted: August 29, 2009 at 5:32 PM
Actually the REC-12 does not have a locking mechanism, so the 451M is necessary. By the way, does anyone know where to find the parking light wire on a 2001 pathfinder? I tried the pink/blue on the SECU and it didn't work. Not sure where else to look. Thanks.
Posted By: howie ll
Date Posted: August 29, 2009 at 6:18 PM
Junk this unit. If it has no lock/unlock wires how can it be a keyless entry system? Also how will it enable a 451 whick uses lock/ unlock wires from the main unit to trigger it?
Posted By: mikvot
Date Posted: August 29, 2009 at 6:56 PM
Power Unlock YELLOW (-) SECURITY MODULE LEFT OF STEERING COLUMN REQUIRES DOUBLE PULSE. PowerLock LIGHT GREEN (-) SECURITY MODULE LEFT OF STEERING COLUMN
Your Omega has (-) lock and unlock ouputs. The green lock wire will go to the light green lock wire of your car. The blue wire will go to the yellow unlock wire of your car. In your programming you will need to change feature 5 to dbl unlock.
No need for the 451m
Posted By: Chris Luongo
Date Posted: August 29, 2009 at 7:20 PM
Easiest place to get parking lights on the car is at the back of the dash dimmer.
And the factory power doorlocks do work, correct? It's only the keyless entry remote that doesn't work? If you turn the key in the outside driver's door, the doors will lock and unlock?
Like the others said, if your keyless system doesn't have doorlock outputs, it couldn't control the 451M even if you wanted it to.
Posted By: hitman1733
Date Posted: August 29, 2009 at 11:02 PM
Let me restate. It has the ability to support the power door locks, but it needs a relay. It has a three prong connection to support the 451M bypass. I have figured out how to connect it properly, but the parking lights are giving me problems. autotoys support swears that it's the Pink/Blue wire on the SECU. It didn't work though. I'll have to check it with a multimeter to see if it gets 12V when the parking lights are turned on. Are you sure that I can use the dimmer wire in the dash? Won't that mess with something else? Thanks.
Posted By: Chris Luongo
Date Posted: August 30, 2009 at 12:31 AM
Testing each wire before connecting to it is standard install practice.
Connecting wires without first testing, is pretty risky.
Also, I think every Pathfinder / QX4 remote start I've ever done, I've always used the parking light wire at the dimmer switch.
NOTE: There's also a pink/black at the dimmer switch, that will test as a positive parking light wire with the dimmer unplugged......but it's really the dimmer wire. If you try to power this as a parking light wire, the dimmer switch burns out.
The correct parking light wire should be pink/blue.
Posted By: howie ll
Date Posted: August 30, 2009 at 3:03 AM
Those yellow and light green unlock/lock factory wires, set your DMM to DC amps, place your red wire to each in turn with the black wire to ground., do this with all doors closed bar the driver's, hook over the latch in the driver's door, remove or push closed the driver's door contact, rmove the key from the ignition, and in turn place the black probe to ground. If you've done this correctly the vehicle should lock and unlock. Check the draw on the meter. I'm suggesting it will show no more than 120miliamps current draw. This is known as a low neg. Test that "3 prong" junction. On locking 1 terminal will go to ground for about 0.8secs. Ditto with the other on unlocking. Ignore the middle terminal. That should be sufficient to control your locks although if I was unsure, insert a 1N4004 diode on each with its band away from the connections. Solder your joints and remember as Chris so rightly says TEST TEST TEST.
Posted By: hitman1733
Date Posted: August 30, 2009 at 5:58 PM
Well I have everything working but the parking lights. I know the wire is correct because when I turn the parking lights on I get 12V on the wire, and 0 when off. The polarity of the system should be negative...right? The dome light works as it should, they why wouldn't the parking lights? I double checked the setting of the parking lights on the Omega and all should be set correctly. Any ideas?
Posted By: howie ll
Date Posted: August 30, 2009 at 6:12 PM
Please don't go in for removing unexploded bombs. You said you tested it and it was 12v+ when on, therefore your light feed should be POS.
Posted By: hitman1733
Date Posted: August 30, 2009 at 6:26 PM
The locking system is either 3 Wire Negative, or 3 Wire Positive. I have it set up as a 3 Wire Negative. With that set up the dome light works. Both the parking lights and the dome lights work off of the same setup. The question is...would the dome light still work if I was wrong and the system should be set up as a 3 Wire Positive system?
Posted By: Chris Luongo
Date Posted: November 07, 2009 at 11:30 AM
The SECU should be a silver metal box, just to the left of the steering wheel......behind those three switches on the dashboard that have the dash dimmer.
It has three plugs, all of which face down and the wires are are very tight to connect to.
It should making clicking sounds internally when you operate the car's power door locks.
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