Originally Posted by scumbagsleeper

Hopefully that is the only area of the car that has had water damage. Maybe the harness grommet the goes through the firewall is cut for stereo wiring (mine was) and letting water in, or maybe the sunroof drain tube? I did see the red amp wire in your picture and bet they ran it the same way that somebody did to mine. Under the hood if you remove the passenger side cowl cover (the plastic beneath the wiper arms) you will find the engine harness grommet. Or just follow the red power wire added to the battery haha

Originally Posted by cleric670@gmail

One side of the connector is M72, the other side is F102, both are in that picture I linked, if your harness is that exact same layout then that's the one you need. A wrecking yard will probably have no clue what you're talking about if you just call around looking for an SMJ though, fortunately there's a REALLY good chance that any donor vehicle you find will have one intact.

I would start by checking local pick-n-pulls to see if there are any G35 in the yard, I think that same SMJ was used in all models from 2003-2007 coupe and 2003-2006 sedan. If there aren't any then look for any newer G35 on the V36 chassis (2007-2008) and if not then any Infiniti Q50/Q60. If those aren't available then widen the search to ANY Nissan or Infiniti models around that year.

On the driver side is a different style of SMJ with fewer wires, you might end up cutting a couple different SMJ's off of different vehicles and using 2 or 3 of them to get the total wire count high enough, there's 46 total wires in the one you have if it is the SMJ I linked.

If you go that route just make sure to leave plenty of wires on both sides of the ones you pull from a donor vehicle. Yes you will probably have to replace BOTH halves of your existing SMJ, that much corrosion inside those pins will cause nothing but problems in the future so I'd get rid of the entire thing.

Originally Posted by Grokster

This is exactly what I found actually, I've already sealed it with atv sealant. I'm also going to check the drain plug while I'm in there because why risk it when everything is torn apart I might as well make sure it's flowing..

next on my list is to run some water over the sunroof and look for leaks, then the new patched area of windshield strip/firewall grommet.

Thanks!

Originally Posted by NicPirez

Did you solve it the water problem? I been having the same problem, after a rain day my car won’t start, where exaclty did you find filtration of water? I literally put a hose throwing water on the sunroof and the hood and can’t find it, Like where is the firewall who make the problem here? where the water come from? Sorry for my English