Additional AMP to boost audio
In some of the early BMWs (pre 2001) that
were equipped with the BMW radio produced by Alpine, the audio
for phone is considerably lower. This limitation was
compensated for with the BMW HIFI stereo systems such as DSP.
If after installing your Bluetooth system the audio volume is
too low, first try the following steps and then your next option
is to add an additional telephone amplifier as shown below:
With the ignition on press and hold the
pairing button to activate voice recognition. Say the command
"Volume up" until the volume is maxed out.
With the ignition on and IN a Bluetooth call,
press the volume up on the phone, the volume up on the steering
wheel and the volume up on the radio controls. One of those
three options should help you out.
If Equipped with nav, while the ignition
is on you can also increase the TP volume in the radio service
Radio Service Mode OR
Radio Service Mode Old BMW radios
If none of those options boost your volume
loud enough we can provide you with a Telephone amplifier to
easily install on your Bluetooth harness
Bluetooth system Audio Amplifier Kit -
includes instructions and additional wiring to easily connect to
your Bluetooth harness
If you are installing Bluetooth in the
following BMWs the amp may be required.
E46 with NAV produced 08/01 and OLDER
E46 without NAV and have the BUSINESS TAPE produced 02/01 and
E46 without and with have the BUSINESS CD produced 08/01 and
X5 with NAV produced 09/01 and OLDER that DO NOT have DSP
X5 without NAV produced 09/00 and OLDER that DO NOT have DSP
E39 with NAV produced 08/01 and OLDER that DO NOT have DSP
E39 without NAV produced 08/00 and OLDER that DO NOT have DSP
E38 All years without DSP
Basic installation instructions
The amp used is a common 12V DC telephone
amp from ELK. The power is drawn from pins 34 and 39 on
the 54 pin harness for (compensator power). In order to
connect to pins 34 and 39, you will need the two connecting pins
that come as part of your kit
Step 1) Remove the cover on the 54 pin
connector. You can easily lift up the tabs and gently pry
out with a small sloted screwdriver.
Step 2) Locate pins 37 and 38. 37 is
speaker positive and 38 is speaker negative. Take note of
which wire is located in each location. Remove these
wires by pressing down each of the tabs and gently pulling the
wire out. The first wire only lets you pull the wire out a
very small amount although provides you access to the second tab
to release the wire out completely.
Step 3) Cut the two wires and connect them
inline with the amp. The side connected to the 54 pin
harness is the INPUT. The side connected to the other end
of the adapter is the "Speaker". Once pins 37
and 38 are connected to the amp reconnect them to the same
location on the 54 pin connector you removed them from.
a) In the 3 series E46 connect one of the new wires to
pin location 34 and the other to pin location 39. The
order connected to the ELK800 is pin 34 to the connector on the
left and pin 39 to the connector on the right of the ELK-800
b) In the 5 series E39, 7 series E38, and
X5 connect the new wires to the 3 conductor wire that is used
for the compensator. On your phone harness wiring there
are a few other wires. One of those wires is for the compensator
and is most likely not being used in your car. This plug is a 3
pin plug. with a red, brown/black and white/yellow wire.
PLEASE NOTE: It is NOT a yellow/grey, like the one that goes to
the CD changer. This plug will be in the same harness
of wires as the other phone wiring. In order to connect
the wires, I would recommend backing the two wires out of the
connector and taping together with electrical tape. Some
users actually connect those two wires directly to the amp,
either are a fine solution, but I prefer the electrical tape
Connect pin 3, white/yellow to the
connector on the left of the amp, and pin 2, brown/black to the
connector on the right.
Use the wheel on the amp to increase the
in-car volume on your Bluetooth system. You want to turn
it pretty far down as the amp goes upto 10 Watts and you will
only need about 2 Watts.
Put the cover back on the 54 pin connector,
by sliding it together, and connect to the ULF module.