I was in Florida for almost the entire month of July and my Q70 was in some very very heavy rain. I had no issues.
I suspect a problem in your wiring harness, a NATS, issue as you have not made it clear if you are using a factory key fob that has been properly programed to your ECU.
BTW are you missing the fiberboard shroud underneath your vehicle that may have allowed water to splash up into your engine bay and cause electrical issues?

 

Ok. I am missing a fiberboard. I also have the original key. I had a guy come by yesterday to reprogram it anyway. It seems to work fine. He only said that on the car side, something might be stopping the connection from reading. The key is proper. So he couldn’t help anymore.
but yes I am going through all those methods right now to see. I know the rain is a factor.

 

There is water in the battery tray and it went down the cabin filter area. The passenger floor is wet. The neutral switch is fine. I will try a few more things. The ECU may have gotten wet then. All the fuses are good, nothing is blown. Would that mean the ECU is good causing our u1000 code maybe?

 

The engine bay bottom cover shouldn't be the cuprit for the CAN code though. However the IPDM is connected to CAN so it's very possible that the problem is somewhere around it.

You should also check the engine start relay in the IPDM, it might have simply failed.

Also check to verify your brake lights turn on when you press them, brake switch may have failed and the engine won't crank without it seeing the brakes depressed.

Also release the vehicle from park, shift it through each gear with the engine off then cycle back up and put it in park. There is a park switch in the transmission that might be failing. If you can't get it to release from park then you'll have to do it manually by removing the small square plastic cover from in front of the shifter then use a small screwdriver to depress the manual release.

 

The engine start relay is good. Brake lights work.
I attached pictures of the battery area. As you can see, there is water and muck in the tray. I'm wondering if the water went under the tray and went inside the vehicle. But the red wire you see was installed by the previous owner. The passenger side of the car is wet under the glovebox. The red wire also comes through the glovebox area through the firewall. So water may have gotten in there too. But regardless, water got down into the cabin air filter area where I pointed to. There is no cover there to block water.
Between all these things, I imagine water got onto the ecu and flooded inside the cabin. All the fuses seem to be good though, so the question I'm trying to ask is, would these factors fry the ecu and prevent the car from starting while all the dash lights, tail lights, and head lights work?

 

^^^

https://nicoclub.com/FSM/G35/Sedan/2008/SEC.pdf#[0,{%22name%22:%22FitH%22},820]

When the starting operation is carried more than five times consecutively under the following conditions, NATSwill shift to the mode which prevents the engine from being started.• Unregistered Intelligent Key is used.• BCM or ECM's malfunctioning.

BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK.ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM ifignition switch is turned ON

Diagnosis ProcedureINFOID:00000000029958351.PERFORM INITIALIZATIONPerform initialization with CONSULT-III. Re-register all Intelligent Keys.For initialization and registration of Intelligent Key. Refer to “CONSULT-III Operation Manual NATS-IVIS/NVIS”.Can the system be initialized and can the engine be started with re-registered Intelligent Key?YES>> INSPECTION ENDNO>>

GO TO 2.2.REPLACE BCM1. Replace BCM. 2. Perform initialization with CONSULT-III. For initialization, refer to “CONSULT-III Operation Manual NATS-IVIS/NVIS”.Can the system be initialized and can the engine be started with re-registered Intelligent Key?YES>> INSPECTION ENDNO>>
GO TO 3.3.CHECK INTERMITTENT INCIDEN

It sounds to me you have multiple issues that are preventing your vehicle from starting.
The removal of the fiberboard shroud may have allowed water to damage multiple electrical components.
Having some guy come to program a key is not going to properly register that key to your BCM.
Tow your vehicle to the nearest dealer and let them tell you what the root cause is.


Good luck

Telcoman

 

I really don't want to take it to the dealer then go broke.... I'm drying out the area with a fan and when it's dry, I'm going to continue following the procedure in the previously attached pdf and do some electrical diagnosis and hopefully try to pin it down.

 

I would disconnect the IPDM, take some good pictures of it, then pull out every single fuse/relay/everything, disassemble it as far as you can then stick EVERYTHING into a bag of rice for 24 hours just like you would do if you dropped your cell phone in the pool.

Also, how did you verify the start relay is working, did you bench test it?

That much water in the battery tray usually means a clogged cowl drain, remove the cowl to expose all the wiper arm linkage and motors and such, there are small drains that divert water and they can be easily clogged. If you take a hose or bucket and pour water from the top of the windshield with everything removed you can see EXACTLY where it's pooling, just be aware that something is plugged up and it's going to end up in your cabin air filter and IPDM area.

This is a very common problem on the V35 chassis due to how small the drains are, less common on the V36 but I can tell from the pictures that you definitely have clogged drains somewhere because you should NOT be getting water like that into the battery area.

Fortunately the ECM sits off to the side of the footwell (I think, not too familliar with the V36 chassis) so it should be fine but you need to get a fan into the passenger footwell to start drying that area out asap and your cabin filter is probably due for a replacement. Just take it out for the time being because it will help everything dry out.

There is no cover to separate the cabin filter from the battery compartment, it's designed to be open like that and thus why this vehicle requires the use of sealed batteries so it doesn't suck corrosive vapors into the AC system.

 

When you reassemble the IPDM apply a light coat of electrical anti-oxidation grease to the spade connectors of each fuse and relay and plug them in/pull them out/plug them in/pull them out about 5-10 times each so it will wear off any surface corrosion that might be present. Do the same for the primary harness connector.

USUALLY that will fix IPDM water damage problems like that. Once the IPDM is dry and reinstalled and the water is properly diverted into the drains if it still will NOT start then you need to verify the IPDM is getting the start signal, quickest way is to pull the start relay and have someone else press the start button while you probe the IPDM relay points for the signal 12v, make sure once you find it they press the button a few times so you can see power cycle on/off to verify it's the correct pin. There will also be a constant 12v signal through it and you don't want to confuse the two. If you do not have the 12v signal from the ECM via start button then you likely have a bad IPDM because there is a SECOND internal start relay soldered to the PCB and controlled by the IPDM CPU.

Section STR - Starting of the FSM is where all this information is located if you want to read the actual steps.

https://nicoclub.com/archives/infini...e-manuals.html

Also I forgot the BCM controls start function on the V36 so water damage to that component is unlikely since it's in the DRIVER SIDE footwell.

However, that CPU inside the IPDM gets all of it's information via CAN so you definitely need to research that U1000 code because that means something is not getting the data signal along CAN.

 

There is ALSO a chance that your starter has simply failed rather than the typical long death cycle one goes through. Unplug the harness going to it and verify the relay signal from the IPDM is NOT making it there, it will be 1-wire harness for the signal/solenoid circuit, if it HAS BATTERY VOLTAGE then the start circuit is functioning but your starter died.

 

Controller Area Network issues are covered in section LAN, these problems can be difficult to trace because components don't send individual codes, U1000 just means the ECM isn't sending or receiving data for at least 2 seconds. These kinds of problems I STRONGLY recommend you take the vehicle to Nissan for a CAN diagnostic since they can literally plug in the Consult-III diagnostic computer and see in real-time EVERY SINGLE COMPONENT sending and receiving data through the CAN diagnostic they run. To troubleshoot these problems yourself is incredibly difficult and time consuming.

There are some functions of the IPDM you can test yourself however to see if it's transmitting or receiving ANYTHING. For example, when you press the lock button on your fob the horn should chirp, that means the BCM is transmitting data and the IPDM received it and chirped the horn. Also turn your headlights on BRIGHT, there should be a light on your dash that turns on to indicate such, this means the IPDM transmitted the signal and the instrument cluster received the signal to turn the blue light on the dash on.

If you have a failure of systems such as this and you are NOT getting things like the horn to chirp when you lock the doors or the blue high beam light on the dash doesn't turn on then you can narrow down a transmit or receive error from a specific component. The T/R chart for all the CAN systems is located on page 29, 30, 31 of section LAN in the FSM.

 



 

hey man did you ever get it fixed?

 

Where you able to resolve ? If so how ?

 

fixed? same thing happening to mine.