ok so i got the new TT fuel pump...hook it up, but car still wont start. we notice the pump doesnt hum or prime itself at all when turning key into on position so we assume it's not getting power...check for power, and nothing anywhere...then we notice none of the dash lights are on with the key in the on position...and the relay box isn't making any clicking noise when turning the key on like it should...we try to check for codes...and the ECU has no power going to it. car will turn over but not fire up, all other accessory **** works, but anything controlled by the ecu...spark, fuel pump, etc are not getting any power. we bypass the fuse and get the pump to work so we at least know it's not bad...some relief i guess...

we call my wrench that did the swap for me, he said check the security system...i didn't know i had this, but behind the board/interior body panel that is like in front of the driver's knees...right under the steering wheel...there's a little black box with a switch that i guess is the main power switch for this gay security system...and i also guess that if this security system is tripped or set off, it causes the car to go into some safety mode where it will not provide power to the ECU, not allowing it to run, i guess to keep it from getting stolen or something...

we reset that by just like playing with the switch a few times, and the car fired right up...drove it a bit, was fine....parked it...turned it off, then it turned right back on when i tried...

i turned it back off assuming all was well, but just to be on the safe side decided to let it sit for a bit before trying to start a third time...and after about 10 or 15 minutes, it wouldnt start again...same **** as before. no pump priming noise, no lights on the dash other than the obviously flashing "security" orange light.

i tried to turn it on, nothing...radio came on, pissed me off because i didn't wanna hear it, and as soon as i hit the off buttom on the radio, the dash lights came on, and i was able to start the car...turned it off again, and then it wouldnt turn back on...just kept turning without firing...so we aren't sure how the security system is connected with the radio, how that would have caused the car to start...but we are totally confused...

what i'm asking you people is if you have any idea what could be causing this strange electrical problem...we checked all relays, all fuses, all wiring....everything else seems to be good...

and if it is my gay security system that is causing all these problems, and if it is somehow tied in with the radio, is there any way i can just totally bypass or override or just get rid of this do-nothing-but-cause-problems security system? i really dont need or want it at all, i'll save up and get a good security system soon enough...

i also noticed that we hooked up the light in the boost guage to my headlight switch...but i noticed the wires from the light on the guage go into this little black box that has the switch for the security system in it...is this box for all of the interior electrical accessories? because if it is, that would explain why messing with the radio might have had some effect on the car starting that one time....

thanks again for the help guys...
__________________

 

Is this the Nissan security system you're having a problem with or an aftermarket alarm system of some sort?

 

if I were to take a guess I would say something is wired incorrectly and causing a short in the anti theft ecu disable circuit... course I dont know much more then squat when it comes to z's electrical systems yet

 

check the hood sensor.

 

If I were you, I'd remove that switch and the factory alarm.

 

thanks guys but this isnt the help i need...

i dont know if its stock or aftermarket, hence me asking in this thread...

if it is aftermarket, i dont know why it would cause such trouble with the factory security system....


and yes, i do plan on just removing it all completely, i dont need or want any kind of security system, i just want to drive it...but i AM NOT going to just go in there cutting wires hoping one will disable the security system, because for all i know, it may permanently lock my car off...and that would not be good...

 

next to the ECU, there's a big metal box that says security on it, yank it out. It should have one harness going into it. (I think). Start looking around the ecu, I think mine was behind, kinda to the right of my ECU.

 

It's actually not a big metal box. It is quite small actually (3" x 2" x2" roughly from what I remember). I believe it's labeled 'theft deter'. It does have only 1 harness going into it. It is under a couple other electronic boxes near the ecu.

 

i had that problem, twice

my car would not start up as quick as usual, then later on it would take me a few turns of the key to turn it on. and then it just wouldnt turn on, starter wouldnt crank, pump wouldnt turn on. but all the electrical stuff worked, lights, cd player

they replaced a blue security system relay by the ecu.

 

how much was that?


and the problem isn't with any security box by the ecu...there is a black plastic box by the pedals that has a switch on it, and that's what we played with to get it to start...but all my interior lights worked (except all the dash lights like oil, seat belt, door, engine, etc...)...


and a friend of mine on a local forum recommended checking behind my head unit, thinking there's a ground to the security system that might be lose somewhere behind the head unit that i might have put back into contact the one time it started when i was playing with the tape player...but is now completely off...so i'm gonna pull that and check for grounds back there...if not i'll look into that security box by the ecu just for the hell of it...but i really dont see what good it's gonna do playing with that since i dont know how to diagnose it or tell whats wrong with it, or what i would need to replace...i have to look through my 1200 page manual to see if there's any diagnosis steps for that security box, and try to find out still what the hell the litte black one by the driver knees/feet is...

 

ok, little black box is an aftermarket alarm system.
Little metal box with the blue relay attached to it is the stock Nissan alarm system.

Sounds to me like the little black box is wired incorrectly or some connections have come loose and need to be checked. Most aftermarket alarms are wired up under the driver's side because that's where all the connections are usually made.

My suggestion either yank it or take it to an audio/security store that does installations and have them look it over. If you found the little black box, you can yank it yourself. Just disconnect the wiring harness from the box and you should be ok. If you want to go as far as tracing back all the wires and removing them, you can. It's not difficult, just time consuming.

 

now removing it won't cause my car and the ecu to lock in the state it is in now...not running...will it?


or will removing the box remove all the confusion it's causing the ecu and the locked state it is in now...

and if it is not this little black box for the aftermarket alarm, any suggestions as to what i might be having trouble with? even though we are fairly positive the aftermarket alarm is causing the problem...there's still the chance i may take it out, and nothing will change...


also i'm not familiar with how the stock alarm works, so maybe somebody can explain this to me...

when i got in the car yesterday just for the hell of it to see if the dash lights would work, so i can go for a quick ride...the parking lights started flashing...like the alarm was going off...what may have caused this? i didnt know how to shut it off, so i pulled the fuse for a bit...then when i put it back in, it started up again, tried unlocking door from outside and holding key in the unlock position for a bit...nothing changed...then got in and put get in ignition in the on position for a bit...and it stopped...so wierd, i hate it...i just want my car to start, and every time...

 

make sure all of your doors are locking and unlocking when they're supposed to. make sure the same with the trunk. if say your pass. side lock actuator isn't doing its job then they may be causing some confusion with your security system. it may be going off because it doesnt know what the hell is goin on.

 

the interior part of the driver side door lock is broken...the actual tab on the inside you push to lock or unlock it is just flopping around, because the unit inside that it connects to is broken...but i can hear the locks locking and unlocking when the key is in the ignition and i put it in the on position, or take it out...


but i really dont tihnk that would be causing all these problems...


but tomorrow or thursday i will be checking the blue relay by the ecu, messing with the switch of the black box for the aftermarket security system, and calling nissan to ask about fixing the interior door locking mechanism to get all three taken care of this week if necessary...i def need to fix the lock and get rid of the black box...the blue relay by the ecu i'll check, then replace if needed...

 

Since you know where the aftermarket alarm is, why not just unplug it and try the car out afterwards. If you know where to pull the fuse for the alarm, why are you putting it back in if it's causing the problem?

 

make sure your battery terminals are tight. Mine kept getting loose and i was having the same problem as you.

 

well, even though i know where the aftermarket alarm is, i dont know how it is wired directly to the ecu, and just unplugging it may cause the car to remain in its present locked state until i re-connect the aftermarket alarm, and disable it properly...

and the fuse i pulled was the one under the hood that controlled the lights that were flashing...that's not going to do anything to stop the alarm, i just did it to get the lights to shut up, stop clicking, and let me think...the fuze is not causing the problem, all it was doing is causing the lights to flash

i will be checking the blue relay by the ecu for the stock security system tonight, along with the battery terminals and playing around with the aftermarket alarm a bit, probably going to call a local alarm/stereo installation place to see what they say, and what they might charge me to properly remove the aftermarket alarm

 

May? May?
Why don't you know? Unplug the stupid thing already! what are you waiting for? if it remains locked then just plug it back in. You won't do any permanent damage.
In my experience, the same fuse that controls the lights and siren controls the alarm. Usually they don't have multiple fuses.

 

i should have some daylight left over when i get home from school today...working mornings and having long classes afterwards leaves me with no time during the week where i can work when it's light out...i dont have garage space to work inside...the garage already has the two harleys in it...and even without them, it wouldnt be near big enough...

will try pulling the fuse under the hood to see waht it does, then will check the relay by the ecu, then what happens when i unplug the aftermarket alarm...

what really sucks though is how even if i can get it to run, i can't really enjoy it that much...the ticking valve lifter drives me insane, and i cant wait to replace it...luckily i still have my old NA motor that i can strip for its lifters...and even worse, is the low compression on cylinder 6, it's not THAT low but i sure dont wanna beat on the car if i'm gonna have it last the rest of this season...

 

ok so i got to play around with it today with the hour or so of sunlight i managed to have left after getting home from school...and here's some things i did, and observations i made...

first i played around with all the fuses under the hood that would in any way seen to be connected with the alarm or the flashing sidemarkers that it sets off...thinking that the alarm and the lights it flashes would both have the same fuse...but that did nothing...

next i dug out that black plastic box for the aftermarket security system...unplugged it to see what would happen...it stopped the flashing, the stock security light was still going off on the dash like always, but that's just because the door was open...once it was closed that stopped...so i turned the key, and still no warning lights came on like they should when the key is in the on position...so i didnt bother trying to start it....it wouldn't have, not worth it

next i hook the black box back up so i could go look for a blue relay that supposedly exists by the ECU, which i was told is the relay for the stock security system...but in hooking up the black box, that gay alarm started going off again, but differently now.
before when it would go off, just the orange sidemarkers in the front would flash on and off...but this time when i plugged that box for the aftermarket system back in, the background lights on the guages were flashing with the orange sidemarkers, along with the turn signals as if my hazards were on, and the lights on the controllers for like the ac and such were all flashing at the same time, at the same speed as the orange sidemarkers did when just they were going off. the only way i got it to stop was by leaving the black box unconnected...


next i went to check by the ECU for the blue relay that is for the stock security system, but it was nowhere to be found...there were other small boxes that were obviously control units for other systems in the car, but none had any kind of label, and i didn't have time to check my manual to see what each was because i was running out of daylight, so i'll check to see what each of them controls tonight...but since i couldnt find the supposed blue relay for the stock security system, i just gave up on that and went on to my next item to check...

i remember the last time we got it to start, it was immediately after i pushed the power button to the tape player...so i checked behind there for a possible ground for the aftermarket security system...and honestly dont know what i found. there was a somewhat loose ground being held down by one of the screws used to mount the tape player, but i had no time left to trace it back to what it is a ground for...i put it in a new spot, a little tighter...and through the biggest cluster of wires i had ever seen behind that tape player (very sloppy install), i couldnt see any other grounds...but who knows what the hell i coulda missed in that mess...

i did put the face plate back on the tape player while the ground was not connected, and the tape player still worked...so i know the ground isnt for the head unit...next chance i get with enough sunlight time left i'll follow it back...but even after i put that ground in a more secure place, the dash backlights/orange sidermarkers/turn signals/control backlights started flashing together again....instead of the previous strictly orange sidemarker flashing...so i left the black box disconnected on the driver side floor until i get another chance to play around some more....




summary of entire post: i am so confused....nissan wiring sucks....and hack job installs on aftermarket security systems and head units mess people over hardcore...