cell phone

[rover3l]

Can the built in cell phone microphone and the speaker system be used to provide a hands free set up for a regular modern cell phone?

[maxnix]

Sure, if you know the required values and can wire it to an adapter for your new phone, there's a chance.

[timatt]

So in my '91Q45, can the built in cell phone be used at all with today's cellular technology??? Its prolly analog right?

Just wondering

Tim

[maxnix]

Original was analog. Whether or not it can be adapted for use with a newer phone of any type would depend on having the phone's technical manual (good luck) and the 3rd party supplier's manual, plus access to the domponents needed to connect the two.

Maybe Dennis could do it (BSEE), if he had the specifications.__________________Brian1995 Q45 & Q45t & 2000 Q45

Discover the power of the button!

[msscomm]

Can the built in cell phone microphone and the speaker system be used to provide a hands free set up for a regular modern cell phone?

Don’t Hold Your Breath - one of our in-house gurus from another field kicked this around a bit on an earlier thread - while the thread kicked around the phone from the complete system viewpoint - the following is a pretty pointed comment ! NICO Cell Phone Discussion

The antenna, mic and phone jack are useless without the trunk-mounted cell phone unit and the handset itself. If you do not have these, then you do not really have a built-in cell-phone. Infiniti merely pre-wired the cars with the above (with the exception of the actual antenna above the rear glass) to save a bunch of labor costs when installing a cell phone.

Z

BTW - the author is perhaps qualified to discuss -

I am Senior Vice President and Chief Technical Officer for a wireless data network company in California.

[szh]

Hi, msscomm.

Don’t Hold Your Breath - one of our in-house gurus from another field kicked this around a bit on an earlier thread - while the thread kicked around the phone from the complete system viewpoint - the following is a pretty pointed comment ! NICO Cell Phone Discussion



BTW - the author is perhaps qualified to discuss -

Thanks for the glowing reference! :blush

As it happens, the specific issues I was addressing in those posts needs to be qualified a bit. The thread asked about built-in cell phone capability without doing anything unique.

So I will add some additional comments that clarifies the situation a bit.

In the original 90-93 Q, the rear antenna had a coax cable that went down into the trunk compartment and attached to a 3 Watt analog cell phone (Motorola OEM to Infiniti) that was mounted under the rear deck. The wiring to the front of the car from the trunk cell phone was to the handset/speaker (located in the area below the "flip-up" armrest), and to the microphone in the dash, and to the audio system (for auto stereo muting on making and receiving a call).

This 90-93 wiring is not very useful for a new digital handset phone without some modifications. You would need to extend the coax antenna cable to the front area. Then, in theory, the microphone and speaker could be wired up to connect to a typical mic/sp plug for the jack on new cell-phones (I am assuming that they can be separated from any amplifier that might be in the circuit - I have not looked at the Infiniti wiring diagrams for this.) Most cell phones also have the same mic and speaker "pins" on their base connectors too. In practice, I am not sure whether the impedances and gain of the mic and speaker will work well, since the jack on new cell phones is designed for over-the-ear headsets (like the ones from Plantronix). But it might work!

In the 94-96 Q, the situation is a bit different. Infiniti replaced the trunk mounted cell phone with a Motorola handset cell phone that sat inside the center armrest storage in a cradle (could be removed and carried out of the car - neat!). Thus, I do not know if the speaker and microphone are wired the same way as a result, or even if there is a dash mounted microphone. However, it is likely that the antenna coax cable is indeed brought all the way to that compartment for access by the cell phone, (BIG assumption: I do not know if it was pre-wired like the 90-93 models - I no longer have my 95 Q to check.)

So ... you gotta go get the wiring diagrams and check things out. Or open up the trunk and see whether you have a coax BNC connector sitting there just below the rear deck. BTW, if you no longer have the antenna on the glass, then this may be a show stopper problem. There is no actual opening in the rear glass for the antenna wiring - the base of the antenna couples capacitively to the mount point inside (the antenna is glued on), so if Infiniti cannot provide you with the antenna, and you do not have another source, you are out of luck!

Z

[szh]

Original was analog. Whether or not it can be adapted for use with a newer phone of any type would depend on having the phone's technical manual (good luck) and the 3rd party supplier's manual, plus access to the domponents needed to connect the two.

Maybe Dennis could do it (BSEE), if he had the specifications.

It is not possible to connect a new cell phone to the built-in original Infiniti cell phone. Even Dennis (BSEE) could not do it! RF design at 850MHz and 1900Mhz is an art and circuits are designed to be "just so". Messing with the circuits with external connections, etc., is more than likely to cause serious functionality problems in the radio operation!

FWIW, as you mention, that phone is indeed analog only and the only connectors accessible are not what a new cell phone could "attach" to. Using the wiring is another issue entirely (see my previous post!)

Z

[szh]

By the way, the pre-wiring in the 90-93 models is an excellent indication of the target market that Infiniti was focusing on. They assumed that most purchasers of the Q45 would want a built-in cell phone, so the extra cost of having the wiring harnesses, coax cable, mic, etc., more than justified the labor and time costs of putting it in later at the dealer.

This is a positive way of thinking! They were ahead of Lexus and others in many customer-oriented ways. Which is why I will buy Infiniti cars over others as much as I can ... my wife still does not understand this attitude of mine! She gets "bored" with the same brand and wants to change - her Acura 2.2CL will probably be replaced with an Audi or Lexus (if I have my way, it will be a G35!)

Z