350Z Tail Light Problems - Nissan 350Z Forum : 350Z / 370Z Tech Forums

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Old 12-20-2009, 05:32 PM   #1 (permalink)
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Need HELP!!!

I have a 2003 350z and my tail lights work when I press the brake but do not work when I have my lights on. I have replaced the bulbs and fuses but still have the same problem. Any useful information would be greatly appreciated.
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Old 12-20-2009, 06:16 PM   #2 (permalink)
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Check around for loose wires/bad grounds.

If you have time I can pull up a wiring diagram of the tail light circuit for you, but right now I'm tired as a dog because I've been up for 23 hours. I'm about to pass out as I type.

Might check the terminals in the socket for power. If they are getting power to them (hooking a test light to ground and touching the probe to the + terminals without shorting it) then that means you have a bad ground somewhere.

But that shouldn't be it because both filaments use the same ground.............

It will almost have to be on the + circuit of your running lights.

Now you got me woken up and I'm not going to be be able to sleep till I figure this out.

Thanks a lot.

(I love electrical stuff.)
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Old 12-20-2009, 06:47 PM   #3 (permalink)
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Oh wow, I just noticed that was your first post. I am new myself but welcome to z-tech!

After lookin at the diagram it appears all the running lights are ran off the same power wire.

Do any running lights work?

If so that means your relay under the hood is good.

There will be a red wire with a blue stripe that goes to the marker lights for power. there is a connector between the front and rears, where it is I do not know. But if you are getting front lights and not rear lights you have a break in the wire somewhere. You will just have to find it somewhere and follow it till you find where it isn't getting power anymore and that would be your problem.

If nothing I have mentioned works or sounds right then let me know. I'm here to help where I can.
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Old 12-21-2009, 01:32 PM   #4 (permalink)
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First, thanks for all the helpful advice and I'll be checking everything that you hae suggested.

All of my running lights work except for the taillights, so I'll check the wire you mentioned.

Thakns for you help!

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Old 12-21-2009, 01:42 PM   #5 (permalink)
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If you don't find it fairly easy holler back here and I will take a few screenshots of wiring diagrams for you.

The easiest way to get the wire is to find it in the hatch and follow the harness towards the front. Should be just a single wire running front to back.

The pink with blue stripe is your brake light wire and it should run in the same harness.
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Old 12-21-2009, 07:03 PM   #6 (permalink)
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The taillights on most Nissans of this vintage derive power from a dedicated circuit in the Intelligent Power Distribution Module. If you can download the pertinent service manual chapters from this site’s Wiki, they should guide you on how to troubleshoot this. It is not uncommon, for the taillight relay inside the intelligent power distribution to go bad. Unfortunately, Nissan doesn’t sell this snap-in relay as a separate part, but some aftermarket suppliers do list them.



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Old 12-21-2009, 07:56 PM   #7 (permalink)
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IIRC the marker lights were all on the same relay in the wiring diagram. That is why I asked if the fronts worked.

I'm gonna double check myself and I will post up the diagrams now that I have some spare time to do so. I hate working off the laptop :(
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Old 12-21-2009, 08:52 PM   #8 (permalink)
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As promised, here are the diagrams.







Part 2



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