2004 645ci problem with mobile phone connection

To use your Bluetooth® wireless technology enabled phone in your vehicle, an initial one-time-only pairing procedure is required. To pair your phone, initiate Bluetooth® search mode in the vehicle. Then depending on the handset, initiate search mode or discoverable mode.* Once the vehicle finds the handset, a Bluetooth passkey is required to complete the pairing procedure.

You may choose any combination of 4 to 16 digits. Enter the passkey on the phone or vehicle, as prompted, and then the other device will ask you to verify it.

If it really is a 2006 or earlier year 335i Coup?, you need the vehicle's Owner's Manual. Since: "Vehicles require a fixed Bluetooth passkey for verification which is included in the vehicle's Owner's Manual."

You can obtain the manual from the dealer, when you provide them with your vehicles VIN-code, for a price of course.

From the BMW USA site:
Bluetooth FAQs

i bought 2003 BMW 745LI
i don't know how to connet phone and also i am not sure it has bluetooth

this sounds like it is a compatability problem ,, not all phones are compatable , you will need to check on the bmw website , where you can see what phones are suitable for your vehicle ,or you should contact your bmw dealer , regards mark

If there is no mobile phone Paired to the
vehicle system and the SIG screen is
displayed, Pairing may be performed as
follows:
Select Phone Mode (if not already
selected).
Use touch-screen keypad to enter the
following digit sequence and press the
Send/End button.
The following sequence performs exactly
the same function, but times-out after
approximately five minutes, ##1#*#.
(If you are not familiar with the Pairing
process, this sequence is NOT
Recommended, because of the time-out
period.)
At the SIG**** screen the vehicle system
is waiting for communication with a
Bluetooth equipped telephone.
Check that your mobile phone is set to the
Jaguar Bluetooth system, using the menu
functions on the phone. Refer to the
handbook that was supplied with your
specific mobile phone.
When Jaguar device is found on the
mobile phone display, the phone will
prompt you to enter the pass key (1313)
on the mobile phone keypad.
When the above operation has been
completed and the phone is successfully
Paired and connected with the vehicle
system, the SIG* screen will be displayed.
S.Y.

jaguar parts dept can supply this very easy, contact the parts dept, they have manuals for what each car needs

The picture Im sending you is the information on your vehicle based on what I can get from General motors tech website to inform you if your intstructions in owners manual are unable to correct your situation.There really no way to quick fix the issue.here is the page information; Before reading note there are unavailable sections or links because it is pasted from a General motors page unavailable to public.
You are looking at a trip to General motors unfortunately unless you can find a shop with a tech 2 scan tool.

Circuit/System Description The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.
In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone’s information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.
Diagnostic Aids • The purpose of this diagnostic is to verify the ability of the telematics communication interface control module to pair to a Bluetooth ® device. • Before performing this test, verify compatibility of the cellular phone(s) the customer is attempting to use with the vehicle. Based on the cellular phone’s service provider and the manufacturer’s implementation of Bluetooth ®, not all phones support all available Bluetooth ® functionality. A vehicle and feature compatibility list will be provided via the GM Bluetooth ® website: http://www.gm.com/vc/bluetooth/ • If the vehicle passes the following tests and a compatible device is being used, the concern may be due to a device malfunction or an incomplete/improper pairing attempt. • A Bluetooth ® test tool or equivalent can also be used to verify the ability of the customers cellular phone(s) to pair with another device. Schematic Reference OnStar Schematics
Connector End View Reference Component Connector End Views
Description and Operation OnStar Description and Operation
Electrical Information Reference • Circuit Testing • Connector Repairs • Testing for Intermittent Conditions and Poor Connections • Wiring Repairs
Scan Tool Reference Control Module References for scan tool information
Circuit/System Verification

1. Verify DTC B2485 is not set.
→ If DTC B2485 is set , refer to DTC B2485
2. Set up a Bluetooth ® test tool or equivalent.
3. Ignition ON, perform the discovery/search operation with the test tool. Verify the vehicle appears in the list of available devices.
→ If the vehicle is not in the list of available devices, repeat the discovery/search operation. If the vehicle is still not in the list of available devices, replace the K73 telematics communication interface control module.
4. Follow the instructions provided in the Vehicle Owners Manual for pairing a device. Verify successful pairing with the test tool.
→ If pairing is not successful, repeat the pairing process. If pairing is still not successful, replace the K73 telematics communication interface control module.
5. Refer to Diagnostic Aids.

Repair Instructions Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for telematics communication interface control module replacement, setup, and programming

To do that ignition off, press and hold the bluetooth pairing button located to center console for 3 sec. switch to ignition key to 1st position(acc) and keep press holding the button for another 3 sec untill the bluetooth pairing sign on then you can start bluetooth and mobile pairing

You need to go to your bluetooth menu in your phone and search for audio devices but at the same time you need to search for the phone in your i drive menu in the buetooth funtion . Be carefull and dont go into communication menu in your idrive press down on the button and scroll down. when the vehicle and phone find each other enter 0000 as the passkey unless you have changed it. Jst bare in mind just because they both have bluetooth does not mean they are compatable. the year of your car determines the level of software in your control unit in the car but updates are available from bmw dealers

If you go to your local bmw dealership they can connect their tester and access the bluetooth code from you vehicle in about 2 minutes. steve