Nissan Titan 504K sensor install

Please help this newbie's project. I've done some simple wiring jobs/installs for stereos, battery isolators, etc. but this alarm stuff baffles me. I received a 504K shock sensor today to install into my 2005 Nissan Titan SE King Cab. I have OEM factory alarm and no remote start and don't want it either. I don't want any bypasses or any such thing. Since I have a King Cab (2 real doors) I assume there aren't 4 door trigger wires. All I want to do is to install the 504K and have the factory alarm keep working. The Directwire wiring page that came in the package is for a 2005 Nissan Titan with remote start. I have a 2005 Nissan Titan without remote start, but the wiring chart looks like others posted in this forum for Nissan Titans. The Directwire wiring information page is like a table with 4 columns. The tops of the columns are not labeled. What do the last two columns mean? what is "5wi?" what is "BCM to right of column," and how and where do I access it? where and what is the best way to access the ignition harness? To use the door trigger, there are notes in the Directwire wiring information page that say to use all 4 wires and use a diode to isolate each. Are these instructions for me or can I just hook up the blue impact sensor wire to any one of the door trigger wires?Since it is a King Cab (without 4 doors) there should only be two door trigger wires at most and not 4. Why do I have to hook up the one blue impact sensor wire with a diode to both?    If i need to include a diode, which direction should it be wired? Is it one diode from my blue impact sensor wire to the door trigger wires or is it one diode on each of the door trigger wires to my blue impact sensor wire? Can anyone diagram this wiring? From the diagam it seems the door trigger wire may be negative. The Directwire wiring information page shows in the 3rd column a - sign. If this means negative, or ground, then the factory setting of the impact sensor which the instructions say are factory set at negative, everything is already set right? I really don't want to screw this up and technical support from a company to be nameless has been unresponsive.direction

Parrothead wrote: The Directwire wiring information page is like a table with 4 columns. The tops of the columns are not labeled. What do the last two columns mean?

Last column is location of the wire and the 2nd last column is the polarity of the wire ( -) or (+)

Parrothead wrote: what is "5wi?"

This is a 5 wire ( Type C ) connection : http://www.velocitymotorsport.com/images/install_notes/C.jpg

Parrothead wrote: what is "BCM to right of column," and how and where do I access it?

The BCM is the body control module and it is located at hte right of the column. THis controls all interior functions for the vehicle when the ignition is on.

Parrothead wrote: where and what is the best way to access the ignition harness?

You have to remove the driver's dash area where the knee bolster is and access the ignition wires there.

Parrothead wrote: To use the door trigger, there are notes in the Directwire wiring information page that say to use all 4 wires and use a diode to isolate each. Are these instructions for me or can I just hook up the blue impact sensor wire to any one of the door trigger wires?Since it is a King Cab (without 4 doors) there should only be two door trigger wires at most and not 4.

Use this diagram to diode isolate the four door trigger's from each other otherwise you will have problems with the installatin: http://www.velocitymotorsport.com/images/install_notes/149.jpg

Parrothead wrote: Why do I have to hook up the one blue impact sensor wire with a diode to both?

To isolate the door trigger's from each other. If you don't you will have problems with the alarm system falsing on you or damage the BCM.

Parrothead wrote: If i need to include a diode, which direction should it be wired?

Look at above link for diode direction

Parrothead wrote: Is it one diode from my blue impact sensor wire to the door trigger wires or is it one diode on each of the door trigger wires to my blue impact sensor wire?

Each door trigger needs one ( refer to diagram )

Parrothead wrote: Can anyone diagram this wiring?

refer to diagram

Parrothead wrote: From the diagam it seems the door trigger wire may be negative.

Yes it is.

Parrothead wrote: The Directwire wiring information page shows in the 3rd column a - sign. If this means negative, or ground, then the factory setting of the impact sensor which the instructions say are factory set at negative, everything is already set right?

This means that the triiger is (-) when the door is open and (+) when the door is closed.

Parrothead wrote: I really don't want to screw this up and technical support from a company to be nameless has been unresponsive.direction

Most companies will not support DIY'ers for the main reason that if you damage the unit your installing, they will not cover it unless installed by an authorized installer.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Thanks, this may be enough for me to give it a try this weekend. It seems from talking to others since there are only 2 doors, there'll only be 2 door trigger wires instead of 4.

Yes, if it's only a 2 door then you only need 2 diodes. The diagram is for a 4 trigger system.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

Started yesterday trying to install. Problem with BCM and Door triggers on my 2005 titan. Directwire wiring info shows LF door trigger is lt. blue in pin 47. RF door trigger is RED / blue in pin 12. That must mean they aren't even on the same connector? If there was only a picture or diagram somewhere, that might help. I found what must be the BCM to the right of the steering column. It is big and has 3 banks of connectors. One is at the top mounted horizontally with about 40 pins, two are mounted vertically and about 20 pins each. in about this configuration. How do you number the pins? No matter what kind of system I try, I cant get wire colors to match with anything that would be in any numbering system I can invent, Pin 47 or 12. Worse, there is no wire anywhere near there that is RED / blue, which I interpret to be mostly red with a blue stripe. Is there another way or another spot to find these wires??? _________ | ___     |        | |       |    |     |________    BCM? Can anyone help???

Well, it been a long day in Titanville. I did a lot of other work putting off the alarm project as long as I could. I finally had someone show me the connectors on TitanTalk.com. I found the lt blue wire. It has a gray band around it every so often, too. That connector, M19, does not directly plug into the BCM at all. No wonder I couldn't find the LF door trigger wire! It lies even farther to the right of the BCM, under the center of the dash. Quite a reach. Hooked it up with the diodes the way diagrammed, set it up, turned it on, locked the truck with key fob, waited for OEM alarm to engage, pushed, rocked and shook the poor Titan and... nothing. The indicator light on the sensor showed that it was sending a shock signal, but nothing. After some consternation, it seemed to me the diodes, despite the diagram, were pointing the wrong way. So, I reversed them, went thru the procedure and on the first try, Voila! Jubilation! Horns honking, lights flashing. So after stopping it with the key fob, I set about adjusting the sensitivity of the shock sensor. Retest. This time, no horns, no flashing lights. Now, when the shock sensor sends a signal, it just turns on the interior dome lights. It's very good at turning on the dome lights everytime you shake the truck. When I disable the shock sensor, the regular OEM works fine. What's up with that?

whatamidoingwronghere? anybody know why it only partially works, and just the first time?

velocity motors, do you know where the ALL DOOR TRIGGER is exactly? i found a blue wire in the BCM but i believe that it might be the dome supervision light. it's 12V when the door is closed and it dropps to ~9.5V when a door is open. after i close the door, 1.5 seconds later, the voltage goes back up to 12V. do i have the correct wire?