Hey all, new to the forum. Not new to the G35. Upon searching multiple threads I haven’t been able to find a similar thread with a concrete answer for what exactly is going on with my G. Hoping to find one here,
Here’s some of the backstory/facts...
Just purchased an 03 g35 coupe AT, 260km (161 miles), has a cold air intake and borla cat back exhaust. Also the stock headunit has been replaced, headlights appear to be factory HID. No other mods that I’ve noticed (I got the car yesterday).
I know the battery was no good upon arrival so I replaced it with a new Nissan battery I had, car starts up fine with no CEL’s. However when I turn off the car the front parking lights (small circular orange lights at the lowest part of the headlight housing) immediately turn on and the driver side rad fan remain on after the key is set to the OFF position as well as after the key has been removed. This continues regardless of how long I wait and is the same outcome with the car hot or cold. It only stops when I remove the battery terminal. Now I am familiar with the AUTO Function on the light selector stock and I insured it was set to the OFF position. When the car is running ON or key is In ACC I am able to shut off parking lights via its control however the fan still runs (I’ll have to confirm it continues to run). Has anyone heard of this issue or expected it?
After I remove the battery terminal, wait, and put the battery terminal back on the fan/lights immediately turn back on and I can hear a relay click in the IPDM so I’m guessing I have a corroded/stuck relay? However is it possible that a fan relay can cause the lights to come on as well? I know high and low beam relays are in the IPDM as well. Could it be a bad common ground for the IPDM? (Location E22 termination ground I think) - I have a schematic for all the grounds so I’ll probably clean them all up.
Now if all that wasn’t confusing enough. Yesterday, while I was trying to diagnose I noticed that when I shut the drivers door a little harder it turned off the fan and lights. I assumed it was a feature of the coupe, (to run the fan to cool the engine after its been turned off and shut off the fan when the door is shut) But today shutting the door has zero effect on the lights or fan. They still run continuously. So I am not sure if that is related to the problem or just a coincidence...
Sorry for the long intro, just want to provide as much info as I can. Going to start tearing into it tomorrow morning with a meter in hand but just wanted to see if anyone has any guidance before I spend the time on diag.
Thanks again in advance.
Last edited by Rogue One
on Tue Jan 28, 2020 7:27 am, edited 1 time in total.
Reason: Revise Title