[Paul R]

Does anyone recognize these connectors. They appear to be antenna connectors. They are located in the trunk of my 1994 Q45, but I cannot find anything that they connect to, or are intended to connect to.

I don't think they are intended for a CD changer, because that locates in the right side of the trunk. Nor do I think they are intended for a mobile phone, because the wiring diagrams show different types of connectors. My Q45 has a rod antenna, so they're not for that. Maybe, possible, just a part of the wiring harness, in case a window antenna is used?

I have looked through the service book, and no such connectors are shown in any component layout or schematic.

Hope someone can answer.

Thanks.

 

[Paul R]

Thanks for both responses.
Both connectors are threaded, so not quick connect. And, there's no sign of any add-ons inside the car, nor any sign of an external antenna.
The car has been in my family since 1995, so, if anything was added, it would have been in its first year, but the wiring seems to be a factory install, with an apparent factory correct grommeted mounting for the black lead, per the attached pic. Plus, the plastic support looks like something else, or a wire, was supported there.
I'm thinking they might be connectors for an RF filter, for the audio system? Which, brings me to another problem that might be associated.
With the rear speakers connected, when the radio is turned on, I get an immediate continuous loud howl from the audio system, no matter the volume level. First one howl, quickly followed by a second continuous. The only way to stop it is to disconnect both rear speakers. With one speaker disconnected, there is only one howl, but it doesn't start immediately.

Thanks again.

 

[Paul R]

Well, it does look factory but I've never seen that kind of connection used before. Does the car have satellite radio?

I would suggest pulling up the audio and/or electrical service manuals. You can get them over at Infinitihelp but will have to pay a subscription fee to get the entire manual for your Q45. I think Nicoclub still has service manuals available at no cost as well.

Thanks.

No, it doesn't have satellite radio, and doesn't look like it ever did.

I have the service manual, which came with the car from the factory. I don't know if all q45's came with it, or it was a special order item, but it has full schematics, and full details on all sections of the vehicle. The manual (book) is over 2 inches thick and was supplied in a grey colored box. Nowhere in that book is any info on those connectors. Not in the audio section, the electrical section, nor the component locations in the trunk. The fold out schematic might show them, but without some indication in the schematic to flag the type of connectors and their physical location, I'm not sure I want to attempt the search.

 

[Paul R]

Paul, I want change my last comments to now say that it is very likely an Infiniti installed connection. However, if there is no swivel to the coax connectors, then they must be the type used in tight locations, that although there are threads, this type of push on connector does not have to be screwed on. I have used them before.

Concerning the speakers, I had a problem with the rear speakers on my 91 Q, making loud noises, whistles, and popping that almost caused me to run off the road when driving. I am an electronic technician, and decided to track the problem down myself. I found the problem to be leaking capacitors on the amplifier board. I replaced the capacitors and it fixed the problem. Later I noticed that there was a recall by Infiniti to replace the boards. Your problem seems similar, and you may want to look into it for a possible recall.

I'll check tomorrow, but I think the threaded connectors do rotate, although I accept your suggestion that, although threaded, they could be push-on.

That's a good point about the capacitors, and I should have thought of that, because, to repair front seat functions, and rear window and door locks, I had to replace capacitors in all the control modules in the doors, and also repair some pcb traces. So, yes, I'll check the electrolytic caps. I've got to do the same in the transmission control module also, because I get random indications of a transmission malfunction. and, after fixing the seat and window controller, I had figured that failed capacitors could be the root cause for other problems in the network. I was an electronic design engineer, which, like you, I have put to good use on this car and another relic from the 90's.

Thanks for the reminder.

 

[Paul R]

Paul, I want change my last comments to now say that it is very likely an Infiniti installed connection. However, if there is no swivel to the coax connectors, then they must be the type used in tight locations, that although there are threads, this type of push on connector does not have to be screwed on. I have used them before.

Concerning the speakers, I had a problem with the rear speakers on my 91 Q, making loud noises, whistles, and popping that almost caused me to run off the road when driving. I am an electronic technician, and decided to track the problem down myself. I found the problem to be leaking capacitors on the amplifier board. I replaced the capacitors and it fixed the problem. Later I noticed that there was a recall by Infiniti to replace the boards. Your problem seems similar, and you may want to look into it for a possible recall.

I see your point about the connectors not being swivel. Although they are indeed screw on connectors, and would rotate, the foam wrap prevents them from screwing on the anything. Well, certainly, the foam is not strong enough to prevent rotation, but the fact that the foam is still intact indicates that they were either pushed on, or have never been used.