Hey everyone I recently got a g35 coupe. Long story short purchased car with not knowing extent of some problems.

im in need of help and advice.

1: taillights aren't working
( even with new fuse, it keeps blowing)

2: headlights aren't working ( tails,blinkers, headlights)

3: trunk realest buttons is not working along with the vdc button. I have no power going to them. Any idea?

4: can I use any ipdm that's from a coupe to replace mine? Mines looks like this.

Ipdm that was in my car could this be the problem to my concerns?



I have read about changing all the fuses and whatnot, but nothing has happened. I got some second hand headlights and still unable to get them working. I've replaced all fuses and some relays. Before one headlight would light up if I locked or unlocked car. I believe one of the relays was ticking, I changed it and am still unable to get them working. I've read something about the ipdm I've gotten another one but haven't hooked up yet. Any advice on what I could do please let me know. At this point I'm thinking of using a toggle switch to turn them on.

 

Yes you will need another IPDM from the same chassis, I don't know if the package options all had different IPDM, like if premium package with the sunroof had a different one but I assume Nissan would use the same IPDM for all coupes to save manufacturing cost.

I would start with a new IPDM and go from there, fortunately it's just a plug-and-play component. Just be sure to do any electrical work with the battery disconnected.

It will PROBABLY fix your headlight issue, however I'm betting you have broken wires in the trunk wire loom that is causing the brake light fuse to trip so you should also open up the flexible conduit section and start looking for broken/shorted wiring. You'll probably also find broken wires for the trunk release.

Here's a link to the factory service manual, the FSM starts with the FWD - Forward document. Most of what you want will be in section BL - Body/Locks, LT - Lighting System, and PG - Power and Grounding.

https://www.nicoclub.com/archives/in...e-manuals.html

Any other questions along the way please just update this post, curious to see how it all turns out.

Btw what year and what package does the car have? If you're not sure then it's usually as simple as "what transmission" "Does it have Brembo brakes" "Does it have the Bose stereo system" "Does it have a sunroof" "Does it have orange stitching on the steering wheel and aluminum pedals".

 

It does have a sunroof, power everything, heated seats etc as far as system goes the radio and "finisher" wasn't present in the car at all along with aftermarket steering wheel. Thanks on the recommendation of the ipdm. I've seen a YouTube video of a kid doing it and wipers began to go crazy. That wouldn't bother me much. Since I could take fuse out until it rains.
no Brembos

Thank you again for the references.

 

Ya that IPDM is toast.

 

I know cleric said it didn't matter but would u happen to also agree it doesn't matter what ipdm I use just match the year. The one I got was from a auto

 

The only thing different between the years that was controlled by the IPDM I can think of is the daytime running lights. I know the 06/07 had different circuitry than the 03-05 models. But Im not sure if they changed the internals of the IPDM to accomplish this, or if they just changed the wiring downstream of the IPDM.

Maybe someone can compare schematics for us and verify.

 

thanks for letting me know some info. Today is the day I will mess with it. Since it's been 36 degrees all week

 

Update time:
so I got a new ipdm well a used good one and yet my wipers and headlights still are inop.
when I lock the car I can see passenger headlight blink like any other car. But when trying to use turn signals and headlights I get nothing. You guys have any idea? Also still can't get into my trunk unless I crawl through back seat.

 

EDIT: When you arm the security system from the fob, your turn signals should illuminate briefly and your horn should chirp this can be used to verify the IPDM is working properly. If you hit the panic button your headlights should also flash. This can be used to troubleshoot the issue, if they all WORK then the IPDM is functioning as well as the circuitry to the various devices.


Verify you're getting power on the relay pins in the IPDM, look on the side of the relay to see where the battery + - power is and the other two sides will be the control for the relay. Have someone turn the headlights on/off while you test for the signal voltage. Also probe the tops of fuses 72, 74, 76, 86 while you switch the headlights to see if there's power going through the fuse.

If you're not getting primary power through the IPDM light relay check the harness for damage as well as the fusible link. If you are getting primary power but not control voltage to the relay check the cabin fuse block for blown harnesses and then start testing at the BCM for power out and back from the buttons.

Since you lost a lot of function for things that go through the clock switch I'm suspecting that your clock switch failed, headlights, turn signals, test the horn, if you lost that as well I would just replace the clock switch because it likely broke internally.

Brake lights are a completely separate system, does it blow the fuse immediately when you install it or only when you press the brake pedal? If you unplug the tail lights does it still blow the fuse? If you unplug the CHMSL does it blow the fuse? If it still blows the fuse with everything unplugged then you have a wire shorted to ground.

What did the wires in the trunk harness look like when you inspected them all for broken wires?

 

wires in harness are ok yes turn signals work when I lock/unlock fob. Dash lights and all work fine. I'm just having problems with the actual headlights no registering with the handle.
no blinkers, headlights or tail lights. Brake light works fine it's the actual tail light u know for driving in the night. Could a bad switch be the problem? Like the handle itself

 

When you press the panic button on the fob do your headlights flash?

 

For the parking lamps, I would unplug all the lamps, put in a new fuse, turn the lights on and see if the fuse holds. Don't forget the license place light, thoroughly inspect all the harnesses for corrosion/damage especially the license plate harness.

 

no they don't. Might be my key fob but I doubt it.
u asked about fuses and it seems none of the fuses are continuing to blow just the inop or the lights and functions I listed.

 

At this point I would go down to Nissan for a diagnostic, I'm starting to get the feeling that your BCM might be failing.

 

If u have the pinout for the ipdm, you can just apply power to the correct wires on the harness and see if your lights work that way. Pretty much bypassing the ipdm.