My G35 has a mind of its own here and there. At times, the key fob won’t unlock doors, but sometimes it will work. Sometimes it unlocks when I’m close by or far. Idk. Door lock actuators work, sometimes they don’t. This one time I left my car parked with the windows down and so when I wanted unlock it, it just didn’t want to. An hour later, it unlocked. Idk if it’s the actuators themselves or the security system that’s going bad or the key fob signal. I replaced the battery recently for the key fob but didn’t do anything. 2004 G35 Coupe 5AT

 

This has been happening to my 03 G Coupe recently as well. It started doing it when I installed the red security light that goes behind the bezel around the clock on the dash. That may have been why the previous owner removed it, but if anyone has any info that would be helpful.

 

I think all those functions are controlled by the BCM. Maybe its going bad? Does cold/hot weather have any effect on it?

 

I’m not so sure. Also update, I got a code for the crankshaft sensor but the car starts with no issues. Should I replace it anyway?

 

I would clear it and see if it comes back.

 

I would definitely replace that crank sensor with a Hitachi or Genuine Nissan now before it fully fails. Those codes don't just pop up for no reason and you're LUCKY if you get warning like that before it just shuts off and won't restart again.

As for the intermittent window/lock function, sounds like either a bad fob, bad antenna, or failing BCM. Hopefully you have a second fob you can use to rule out part of that equation.

 

so today I replaced the crankshaft sensor with an OEM one. Installed. Okay, now for the bad news. I tried to start the car but the car just doesn’t turn on at all. And when it does, it makes the most roughest idle that doesn’t even pass 500 RPMs. And no SES light came on. I replaced MAF sensor 1 week ago, did spark plugs 7 months ago, and put a new air filter. What could be the problem?

 

If it was running fine before u changed the sensor, then its probably the sensor or the wiring. I didnt mess with anything else, right?

U can put the old sensor back on and see if it fixes it.

 

Check to make sure the new sensor is sitting all the way into the bore and the connector is fully connected and is not loose.

 

I didn’t mess with anything else. The car was running good as well until that SES light came on. The sensor is OEM and I did put the old one back to see if it fixed anything but no luck. I’m lost at this point.

 

Is there a bunch of oil and crap in the harness? Use electrical contact cleaner (read the bottle to make sure it's safe for use on plastic) to clean out the harness and in the sensor if it's oily. Also make sure you didn't bend any pins in the harness.

I would hook up an OBD2 sensor and check for codes, also pull and inspect the spark plugs you might have an unrelated issue.