Hey gang; decided to order the sequential mirror turn signals for my Q70 and would like to wire up the puddle lights to work alongside the led puddle lights located on the outside door handles/welcome lighting. The lights require simple power and ground. Was looking at the wiring diagram in the Service Manual for the handles. I see that there are 4 wires for each, but nothing is listed for what they do...does anyone have any idea? Any potential issues with trying to wire them to those? I'm assuming the car sends a 12V signal to those lights and that there's power and ground among those 4 wires...any thoughts or insight would be greatly appreciated.

For reference they are:

Connector No: D17, Front Outside Handle Assembly LH

and

Connector No: D47, Front Outside Handle Assembly RH

Remind me on Wednesday when I'm back at the shop, I'll pull up the WD's for you and find out which wires do what.

Will do, much appreciated!

Following up to see if you can still get a look at the wiring diagram

Minus will be Black/White on both sides. Plus on the driver's side is Violet (Canada only) or Brown (all others), passenger's side is Red (Canada only) or Green (all others).

Thank you!

One more request: connectors D12 and D42, the driver and passenger side step lamps

On D12 Brown is plus, Lt Green is minus. On D42 Green is plus, Sky Blue is minus.

Thanks again. This may end up being more complicated than I thought. From what I'm reading from the Service Manual, I think with the Welcome Lighting, the bcm is controlling the ground that activates the door handle led. This is causing my mirror led to backfeed when the bcm cuts the ground since the positive remains live...

Yah, we've seen problems like that with welcome lighting before. You should be hooking up across both wires whether you're using the handle or door lamps as your source, don't connect minus to a regular ground. Your LED's may have a bypass resistor internally instead of a blocking diode, if that's the problem you can fix it by putting a regular power diode (1N4001, 1N4004, etc) in series with your LED's. That will prevent any backfeed through the bypass resistor.

I was beginning to think I would need a diode, so trying to read up on that now. I think I want to add a relay in just for some added protection so that the mirror leds aren't directly tied to the factory circuitry (I've already blown one bcm, really trying to avoid doing so again).

Could you elaborate on what you mean by wiring in the diode in series with my mirror leds? Aka dumb it done for a novice such as myself lol.

The diode will have a cathode and anode end, cathode is marked with a stripe on the body of the diode. Connect the anode to the +V source, cathode to the LED positive wire. Diodes are basically a check valve for electricity, current can flow from anode to cathode but not from cathode to anode. So wired as above, it will let juice reach the LED from the +V source but prevent any voltage from traveling the opposite way and confusing the BCM's power saver circuitry. If you're wiring to the handle lights, those are already LED, so you shouldn't have any issues if you connect your new LED's directly across them, plus to plus and minus to minus. Using a relay might be risky, a relay coil will draw substantially more current than any LED puddle lamp.

PS - Just disconnect the battery while you're tapping wires. No juice = no shorts = no BCM damage.

I do plan on using the door handle circuit since that gives me the idea result I'm looking for. The door lamps were going to be my plan b if I couldn't get the door handles to work.

So with your suggestion, by using the diode to stop the back feed, I can now use/connect the door handle's ground to my led's ground (the minus to minus you mentioned up above) and have it function properly with the Welcome Lighting as intended...

Am I following correctly?

Yep, that should work right.

Ok cool. I've gone ahead and ordered some diodes..
You mentioned earlier that adding a relay could be problematic..is there anything I can do to create a buffer to protect the factory circuitry? I'm more so trying to think ahead of a scenario where somehow my diode fails and my lights begin backfeeding and blow my bcm..just trying to figure out some sort of preventative measure..

To run a relay off a low-level signal you need a transistor driver. It's easy enough to build one, two 10K resistors and any common N-transistor, 2N3904, 2N2222, 2N4401, etc. This one is the only off-the-shelf option I know about:
https://www.ebay.com/itm/143103138738

I appreciate the link because building one is outside my wheel house lol. Is there any specific relay you'd recommend?

My plan originally was to use this:
https://www.amazon.com/dp/B00LLKHQNC?ps ... ct_details

Yah, that's a 40A "Bosch Box" type, that's the standard go-to for aftermarket relays. You can get them a lot cheaper than that, here's a 5-pack with pigtails for $8.30:
https://www.ebay.com/itm/353901550540

I already bought the one from Amazon. So long as it'll work I'll just keep it. Besides I'd be buying the extras just for them to sit. I plan for this to me my last wiring job for quite some time lol.

So now my question is how the heck would I hook all of this up lol. I was familiar with how to wire in the relay, the transition driver adds a new unfamiliar concept.

Honestly, that same power circuit from the BCM drives a lot of other lamps and I wouldn't be worried about any harm from a few extra LED's loading it. The way guys hurt those circuits is by accidentally shorting them together or to ground during an installation, which can cook the driver FETs inside the BCM. LED's automatically block voltage if they're installed backwards (after all, they're diodes). That's the only other mistake you could make and it's harmless. In the long run, the extra wiring for a relay is more likely to cause problems than solve them. Keep in mind, if you only use one relay and not one on each side then you'll be running a wire all the way across the car and into a door. No fun there and a lot of opportunity for screwing up. So I'd just disconnect the battery and wire your extra lights across the existing puddle wires. Do it carefully and the BCM won't mind a bit.

Generally speaking I would hear and agree with you. My bcm was operational but I definitely did enough to screw up the line for the door handles. My issue wasn't wiring them incorrectly but rather the backfeed (at least that's my and Infiniti's theory).

In the end the addition of a relay adds some protection. I don't mind having to run the line across the car. I'm just trying to get these to work, not screw up my bcm again, and add some protection in case the diode were to ever fail.