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Hey guys, 2004 350z: I'm not getting power to the passenger headlight high and low pins on the headlight plug. All other pins get power in the plug.
I tested the wires behind the plug with a probe, and all the other wires going to the park lights get power, but the 2 wires going to the high and low don't.
I checked the high and low fuses to pass headlight and they are fine, and the relay is working. the drivers side works fine.
Any ideas? This is odd. Thanks for your help in advance!
Most likely damaged/broken wiring, looking at the Z in the pic, which I assume is the one in question, it does appear to have accident/collision damage at or around the front right headlight.
Get the FSM wiring diagram and do some trace/continuity checks. You can pickup copies of the FSM on Niccoclub forums. I'm guessing you have a clean break somewhere since the relay is working and the fuses haven't blown (yet). It could also be something simple like a broken ground connection for the circuit. The signal and parking lights have separate Batt + circuits, but I don't know if they share the same ground with the main headlights (I think they do). If the ground connection is shared, then I think it's safe to say the break is between the Batt + feed and your headlamp harness plug.
Have you probed both sides of the fuses? Are you getting + Batt voltage there? If YES, then you should be able to isolate the problem between the fuse box and your headlamp harness plug. Where those wires run and if they change colors or go through additional harness connectors is where the FSM circuit diagram will help.
Thank you so much for your incredible response Icer - I found corrosion in the IPDM! I pulled it and cleaned everything, lubed the contacts and we are now good to go!!
Gad you got it sorted. I guess I responded to a duplicate thread you had made on the same topic. Posting my response here (referencing the wiring schematics in the FSM mentioned by Icer) in case anyone else runs across a similar issue.
Just to answer Icer's question, the wire color does NOT change from the IPDM to the headlamp harness connector! Well, at least for the power supply for the hi/lo.
Originally Posted by Heel Til I Die
There seems to be a break in the wire somewhere leading to the passenger (RH) headlamp if everything else checks out.
It sounds like you have a multimeter. Check for continuity on the headlamp circuit between the IPDM E/R and the headlamp connector. You need to disconnect the IPDM connector and the headlamp connector. Connect your two probes of your mulimeter to the corresponding terminals to make sure the the circuit is closed.
This is for HID:
For the RH high beam, it's terminal 27 on the IPDM connector and terminal 3 on the RH headlamp connector. (On my '05, the wires are brown)
For the RH low beam, it's terminal 20 on the IPDM connector and terminal 7 on the RH headlamp connector. (On my '05, the wires are red)
For non-HID/halogen style:
For the RH high beam, it's still terminal 27 on the IPDM, but it's terminal 2 on the RH headlamp connector.
For the RH low beam, it's still terminal 20 on the IPDM connector, but it's terminal 6 on the RH headlamp connector.
Kudos to Heel for the detailed pin-outs from the FSM. Also glad the OP was able to find the source of the problem. It's not unusual for engine bay fuse/relay boxes to have corrosion problems, typically a problem for folks living in the rust belt or near the ocean. But can also be attributed to lack of maintenance in the form of clearing out tree debris that ends up around the cowling. Many Zs I see on the road today don't even have the battery/IPDM or brake/clutch covers anymore. Nissan put those there for a reason and if you park outdoors, under trees, you're bound to start collecting debris in those areas...which in turn clogs up the drainage system around the fenders/firewall, and in the rainy months will lead to water damage, rust, and corrosion. A lot of headaches can be easily avoided by just keeping those $40 covers in place, the plastic fasteners always break, but are also cheap and easy to replace. Ok rant over!
I was fairly certain the IPDM handled the circuits for the headlamps (directly), but I didn't want to state that as a "fact" without checking through the FSM. My copy of the FSM is for an 06, and TBH, I didn't feel like going the extra mile to get a copy for an 03-05.
2004 350z: No power to right headlight hi/lo plug
