GROM Audio GROM-MST4 AUDI MMI 2G Manual

GROM-MST4
MP3 USB Android iPhone/iPod/iPad car stereo adapter kit
For fiber-optic stereos
Optional Bluetooth and AUX-In extensions
NSTALL MANUAL
SUPPORT: HTTP://GROMAUDIO.COM/SUPPORT.HTML
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www.gromaudio.com
Copyright © GROM Audio, 2015
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TABLE OF CONTENTS
Chapter 1 – ntroduction
1.1 Subject p.3
1.2 Functionality Highlights p.3
1.3 Main Features in USB, iPhone/iPod/iPad, or Android Phone/Tablet Mode p.3
1.4 Bluetooth Hands Free and Wireless, AUX-IN p.3
1.5 Precautions p.4
1.6 Disclaimer p.4
1.7 Completeness and connection of set p.4
Chapter 2 – General nstallation
2.1 Programming the car for GROM-MST4 p.5
2.2 Understanding how the fiber-optics works p.5
2.3 Tools needed p.6
2.4 Electrical and optical installation p.6
2.4.1 CD changer is present and activated p.7
2.4.1.1 Connection into Volvo XC90 2002-2006 at the CD changer location p.7
2.4.1.2 Connection into BMW at the CD changer location p.7
2.4.1.3 Connection into Audi and Mercedes Benz at the CD changer location p.10
2.4.2 Installation into BMW or MB when the CD changer is not present or has not been activated p.12
2.4.3 Installation into Volvo S40/S/60/50 and Volvo XC90 2007+ cars p.14
2.4.4 Important notice for BMW owner’s p.16
2.4.5 Important notice for Volvo owner’s p.16
2.4.6 Important notice for Mercedes owner’s p.16
2.4.7 Important notice for Audi owner’s p.16
Chapter 3 – Testing the operation, simple usage guide
3.1 EXT1-EXT2 ports, Accessories cable connection p.17
3.2 Mode selection p.17
3.2.1 Mode selection for BMW- non iDrive p.17
3.2.2 Quick USB operation for BMW- non iDrive p.18
3.2.3 Mode selection for Mercedes Benz p.18
3.2.4 Quick USB operation for Mercedes Benz p.18
3.2.5 Mode selection for Volvo S40/60, V50, XC90 07-13 Singe CD p.18
3.2.6 Quick USB operation for Volvo S40/60, V50 XC90 07-13 Singe CD p.1
3.2.7 Mode selection for Volvo S40/60, V50, XC90 07-13 6-Disc CD p.1
3.2.8 Quick USB operation for Volvo S40/60, V50 XC90 07-13 6-Disc CD p.1
3.2.9 Mode selection for Volvo XC90 02-06 6-Disc CD p.1
3.2.10 Quick USB operation for Volvo XC90 02-06 6-Disc CD p.1
3.2.11 Mode selection for BMW iDrive and Audi MMI p.20
3.2.12 Quick USB operation for BMW iDrive and Audi MMI p.20
3.3 Installation troubleshooting p.20
Chapter 4 – Support p.21
Chapter 5 – Warranty, license and disclaimer p.21
5.1 Warranty p.21
5.2 License agreement and disclaimer p.21
5.3 Grant of License p.21
5.4 Operation warning and safety instruction p.22
5.5 Other provisions p.22
5.6 GROM Audio Compatibility Disclaimer p.23
5.7 Engine/System Noise Disclaimer p.23
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Chapter 1 - ntroduction
1.1 Subject
Thank you for purchasing the GROM-MST4 adapter. It has been designed to provide endless hours of listening
pleasure through factory stereos of the vehicles with fiber-optic MOST Transport technology, such as BMW,
Mercedes Benz, Volvo and AUDI. To ensure that your GROM-MST4 interface performs correctly in your vehicle, we
recommend that you read this entire manual before attempting to install the GROM interface.
1.2 Functionality Highlights
- Easily access your media collection in your car, including shuffling songs, skipping between tracks, and adjusting
the volume—all with only your factory car stereo head unit or multifunction steering wheel controls.
- Listen to your favorite music directly from virtually any USB mass storage device, flash stick or portable hard drive,
requiring no dedicated media player.
- Android® phone or tablet (most supported) play, charge and control through USB port via standard USB to
Android cable.
- iPod®/iPhone®/iPad® play, charge and control through USB port via standard USB to iOS device cable, both
Lightning style and 30-pin connector cables are supported.
- Bluetooth or AUX- N integration. To get AUX-IN you will need GROM MiniDin to 3.5mm audio and 5V USB
charging cable, to get the Bluetooth hands free and wireless functionality you will need GROM-BTD Bluetooth
Dongle (both sold separately).
1.3 Main Features in USB, iPhone/iPod/iPad, or ndroid Phone/Tablet Mode
- Ability to listen to songs in car on USB mass storage device (such as flash drive), iPod/iPhone/iPad or Android
phone (using free AALinQ app from Google® Play Store).
- Ability to control music from car stereo or steering wheel buttons.
- Folders on the USB drives are mapped to an individual “Disc” button on car stereo’s dashboard. Playlists on
Android phone or iOS device are mapped to discs. Browsing by Album, Artist, Genre is available on BMW iDrive
and AUDI stereos.
- Number of “discs” limited to the car stereo (up to 99 on select stereos).
- Last listened song position within the play list is remembered and time position is restored upon ignition cycle
(*may not apply to some iPod).
- Charging via USB cable while in use.
1.4 Bluetooth Hands Free and Wireless udio, UX-IN Features (with GROM
Bluetooth Dongle or UX cable, which are sold separately as the optional
accessories):
- With hands free (HFP) you can receive the phone calls through the factory car stereo, answer or reject the phone
calls using car stereo or steering wheel controls, speak to the other person using microphone provided with GROM
Bluetooth Dongle.
- Wireless music play from your phone to the factory car stereo (A2DP), control the music or Pandora® internet
radio with the car stereo or steering wheel buttons (AVRCP).
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- AUX-IN 3.5mm audio connector for any audio source, and additional 5V charging port.
1.5 Precautions:
Proper mounting location
Securely install the interface in a location free from heat, humidity, moving parts, or direct sunlight. Beware of hot-air
flow from your vehicle’s climate control system. The interface should be secured in a suitable location, free of sharp
metal edges, using double-sided tape, Velcro, or wire ties. The adapter’s operating temperature range is -30°C to
+70°C (-24°F to +158°F)
1.6 Disclaimer
•This product is not affiliated with any of the OEM manufacturers
•Modifying the stereo may void any existing warranty
•The purchase of this product carries no warranties, either expressed or implied
•GROM Audio has confirmed the listed stereo and vehicle application to the best of our ability. Due to
uncontrollable factors and various factory options, Grom Audio cannot 100% guarantee every listed
application. These factors include variables such as inconsistencies within a factory stereo, factory stereo
models unknown to Grom Audio and any partial model year changes.
•Keep your eyes on the road while driving!
•We are not liable for the misuse of this product, including improper installation, damage to the board or
stereo during installation, and the illegal use of the stereo
1.7 Contents and connection of set
a) The GROM audio adapter set consists of the GROM-MST4 main interface, one automotive grade USB cable
3FT, one fiber-optic connector and P-Tap, and one 2GB USB stick.
1. GROM-MST4 interface 2.One USB cable, 3Ft 3. One fiber-optic POF cable*
* The POF cable is not included for Volvo XC90 2002-2006 package as you will use the existing CD changer connector.
Figure 1. Package contents
b) The basic package does not include the optional accessories that you can purchase separately:
AUX MiniDin 3.5mm USB charge cable GROM Bluetooth Dongle
Figure 2. Optional Accessories (sold separately)
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Chapter 2 – General nstallation
2.1 Programming the car for GROM-MST4
BMW (iDrive/non iDrive):
- If original CD changer fitted and MP3 capability is available: no programming is required.
- If original CD changer fitted and no MP3 capability is available, you will need to retrofit “KMP3” option with
service computer
- If original CD changer not fitted or M-ASK used: install GROM-MST4 and retrofit “CDC” and “KMP3” option with
service computer.
Mercedes and AUD :
-Generally no programming is required but in some cases (e.g. no device was connected onto the optical ring) it
is needed to enable a CD changer with the service computer.
-For Audi Vehicles, before removal of factory CD changer make sure it is able to play MP3 CDs. If MP3 CD
playback is not possible to then the Audi MMI software may needed to be updated for MP3 support before
GROM can work with stereo. (See Section 2.4.6 for more details)
Volvo:
- No programming is required.
- Some cars need MOST security component feature to be disabled in order for GROM to work.
- You will need to contact your local Volvo dealership and ask to remove Volvo MOST security component.
2.2 Understanding how the fiber-optics works
Fiber-Optic vehicles work on a system utilizing a pulse or pulses of light sent around a ring of devices.
Each device sits on a point of the ring which starts and finishes at the same place.
Each pulse will have a unique signal which can be delivered to a specific part of the chain via a combination of light
pulses.
It’s important when installing into the ring of devices that:
a) The ring is not broken and
b) The order is retained after the installation.
Testing the system is quite simple. If you remove one of the directional inputs you should see a pulsing light, if you
don’t see any light you have either the wrong directional ring, or the ring is broken somewhere. Below is an image
(Picture 1) of the GROM POF (fiber optic) cable, which clearly shows the direction of the ring. Please look for the
small black arrows on the black connector. On the picture they are in white
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.Picture 1 GROM Fiber Optic Connector
2.3 Tools needed
•Car audio dash panel removal/trim pry removal tools, screwdriver.
•Please consult your local car audio shop or your vehicle’s dealership for instructions or assistance as
necessary. If you are unsure how to install the interface properly, we recommend contacting your local car
stereo shop for assistance.
•Some installation examples can be found at www.gromaudio.com.
2.4 Electrical and Optical Installation:
1. Turn off car engine and remove key from ignition.
2. In order to install the GROM-MST4 adapter, the external CD changer will have to be disconnected in BMW,
AUDI, Mercedes Benz and Volvo XC90 2002-2006. For Volvo S40/S60/V50 and for Volvo XC90 2007-2003 the
factory CD changer/CD player needs to be left in the fiber-optic ring for the install. In all cases you will not be able to
use factory CD player after GROM install.
f no CD changer is present, the GROM-MST4 will need to be wired into the fiber-optic ring on the vehicle.
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2.4.1 CD changer is present and activated ( nstallation into BMW, Audi, Mercedes
Benz and Volvo XC90 2002-2006 cars):
Scheme A. Connection to BMW, Audi*, Volvo XC90 2002-2006, Mercedes Benz*
when the CD changer is present and activated.
The CD changer connector is usually located in the trunk or glove box of your car.
*Note that in Mercedes Benz and AUDI, the CD changer connector is different than GROM connector. You will need
to transfer the factory fiber optic cable over to the GROM supplied MOST connector, and then connect the 12v &
Ground power of GROM to the CD changer (See Image A & B for further info on Posi-tap connection location).
2.4.1.1 Connection into Volvo XC90 2002-2006 at the CD changer location
Simply unplug the CD changer connector from Volvo CD changer and re-plug it into GROM-MST4 kit.
2.4.1.2 Connection into BMW at the CD changer location
Simply unplug the CD changer connector from BMW CD changer and re-plug it into GROM-MST4 kit.
NOTE: that in most instances the power wires on the standard CD changer connector in BMW are in the wrong PIN
location in order to be used with the GROM. The next image (image A) shows the standard BMW connector with the
PINs in the correct location.
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mage A. Standard BMW CD Changer Connector
If the CD changer connector PINs are in the wrong positions (not as it is shown on the image A, you will need to re-
pin them so they will match image A. Please refer to the steps below for the instructions on how to remove and
reposition the PIN.
How to re-pin CD changer connector
1. Factory fiber-optic Connector showing original Ground
wire placement
2. Release Tab here, use pick to release to allow
removal of 4-pin connector.
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3. Factory 4-pin Connector removed from Main
connector.
4. Gently press release tab with a pick and pull slowly to
remove Pin 2
5. Pin 2 is now freed (Pin 2 is Ground) 6. Now insert Freed wire into Pin 4 location
7. Now snap connector back into place
Connector with Pin 2 is moved to Pin 4 now.
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2.4.1.3 Connection into Audi and Mercedes Benz at the CD changer location
Mercedes Benz and AUD have different than GROM CD changer connector.
You will need to transfer the factory fiber optic cable over to the GROM supplied MOST connector, and then
connect the 12v power & Ground of GROM to the CD changer (See Image C & D for further info on Posi-Taps
connection location).
To understand how to connect Posi-Taps, and where the 12V and Ground wires are located on GROM connector,
please refer to the Posi-Tap instructions on page 12, and the Image E on the page 13.
How to remove Factory fiber-optic to transfer over to GROM supplied connector
1. GROM supplied fiber-optic Connector 2. Use pick to release tab to take out supplied fiber-optic
sub connector (circled in Green)
3. Pull fiber-optic sub connector out and put aside 4. Locate factory fiber-optic connector and release sub
fiber-optic connect by using pick to release tab (circled
in Green)
5. Pull out factory fiber-optic sub connector 6. Put aside main factory fiber-optic Connector and push
sub connector into Supplied GROM connector
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In some cases, when factory connector does not have sub-connector, you may have to release the fiber-optic
cable from factory connector and insert into GROM supplied Connector,
7. Press BLUE retainer plastic inward (circled in Green) 8. Flip connector around and you will see BLUE plastic
retainer coming out.
9. Pull out BLUE plastic retainer from connector and put
aside.
10. Press release tab with pick (circled in Green) and
removal fiber-optic cable and transfer over if necessary
and reinsert BLUE plastic retainer when done.
Please refer to the next image C for connection into Audi at CD changer location.
Positive +12V connects to P N/wire 2, Ground connects to P N/wire 1 on Audi CD changer:
mage C. Connection into Audi at the CD changer location.
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Please refer to the image D. for connection into Mercedes Benz at CD changer location. Positive +12V
connects to P N/wire 1, Ground connects to P N/wire 2:
mage D. Connection into Mercedes Benz at the CD changer location.
2.4.2 nstallation into BMW or Mercedes Benz when the CD changer is not present
or has not been activated.
Scheme B. Connection to BMW or Mercedes Benz
CD changer is not present or has not been activated
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1. Wire the GROM unit into the fiber-optic ring. To do that you will need to remove 1 (one) fiber optic wire from your
factory wiring. It is normally held in with a plastic connector and small push tab. Carefully remove the appropriate
fiber cable and replace with the appropriate GROM fiber cable. Use provided plastic coupler to connect other
GROM fiber cable and factory fiber cable together. Make sure that the light goes into the correct direction, as it is
shown on the scheme B.
2. Connect the GROM power and ground wires with the Posi-Tap clips provided to the factory stereo. Use one posi-
tap to connect the positive +12v (color of the wire is red) to respective PIN/wire, and the ground wire (color of the
wire is black) to respective PIN/wire on the quad lock harness connector.
1. Locate appropriate wires on the car stereo harness.
2. Connect the GROM wires and factory wires using Posi-Taps provided according
to the harness diagram and the color of the adapter wire. The wires that come
from your stereo are “HOT” wires referring to the picture. Don’t forget to strip the
free hanging wires from POF harness that came with your GROM (red and black
colored).
WARN NG! NEVER CUT ANY W RES THAT COME FROM YOUR STEREO OR CD
CHANGER!
mage E. Location of 12V and Ground wires on GROM connector
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Please refer to the picture below ( mage F.) for connection into BMW and Mercedes Benz behind the stereo.
Positive +12V connects to P N/wire 15, Ground connects to P N/wire 12:
mage F. Connection into BMW/Mercedes Benz (rear of stereo connector port)
NOTE: View of the connector behind stereo is flipped around
2.4.3 nstallation into Volvo S40/S/60/50 and Volvo XC90 2007+ cars
1. Wire the GROM unit into the fiber-optic ring. To do that you will need to remove 1 (one) fiber optic wire from your
factory wiring. It is normally held in with a plastic connector and small push tab. Carefully remove the appropriate
fiber cable and replace with the appropriate GROM fiber cable. Use provided plastic coupler to connect other
GROM fiber cable and factory fiber cable together. Make sure that the light goes into the correct direction, as it is
shown on the scheme C below.
2. Connect the GROM power and ground wires with the Posi-Tap clips provided to the factory stereo. Refer to the
Image G below for the exact connection location. Use one posi-tap to connect the positive +12v (color of the wire is
red) to respective PIN/wire, and the ground wire (color of the wire is black) to respective PIN/wire on the factory
harness connector. Refer to the image E on the page 13 for the exact location of power and ground wires on GROM
MOST harness.
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Scheme C. Connection into Volvo S40/S/60/50 and Volvo XC90 2007+ cars
Please refer to the picture below for connection into Volvo S40/S60/V50/XC90 2007 and up.
Positive +12V connects to P N/wire 1, Ground connects to P N/wire 8:
Image G. Connection into Volvo S40/S60/V50/XC90 2007 – 201
NOTE: In Volvo S40/S/60/50 and Volvo XC90 2007+ vehicles, it is very important that the GROM-MST4 unit must
be installed between the Display of head-unit and the CD Player/Tuner. The Optic Light traveling out of the Display
must go to the GROM unit input first, and then the Optic Light out of GROM unit can be connected to the input of
the CD Player/Tuner
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2.4.4 mportant notice for BMW owners.
Please check that the CD changer function is activated on your factory stereo.
If it is not activated you will need to contact your BMW dealer or aftermarket diagnostic company (we recommend
Autologic) and have then activate CD changer mode (typically a 30 minute job).
Autologic: www.autologic-diagnostics.com/en/pages/distributor-locator/world-map
If vehicle is equipped with factory Amplifier (i.e. LOGIC 7 system), it is very IMPORTANT that the GROM needs to
be installed in the fiber optic loop after the amplifier (i.e. fiber optic light coming out of amplifier facing direction into
GROM) and CANNOT be installed in between the Head unit of fiber optic light facing Amplifier. Easy way to
accomplish this is to grab Fiber-optic light direction feeding into stereo and remove and feed this into GROM unit
and complete the rest of the fiber-optic cabling like normal.
2.4.5 mportant notice for Volvo owners – MOST security patch.
Volvo outside of USA: In some cases if the device is recognized and works properly but only for a few seconds
you will need to visit your Volvo dealer and apply "MOST Security OFF" patch.
This patch will allow third party integration devices to work properly with your factory stereo and can only be set by
Volvo.
Volvo within USA: In some very rare cases, if Volvo was imported to US from Europe, the car within US might
have the Volvo MOST security on. No any Volvo dealer within USA can remove Volvo MOST security, therefore
GROM adapter will not work for such car. GROM will accept the device back, but will bear no responsibility for
installation charges. Check out the install video at http://www.youtube.com/watch?v=UJX86A8FVIY
2.4.6 mportant notice for Mercedes Benz owners.
If vehicle is equipped with factory Amplifier, it is very IMPORTANT that the GROM needs to be installed in the fiber
optic loop after the amplifier (i.e. fiber optic light coming out of amplifier facing direction into GROM) and CANNOT
be installed in between the Head unit of fiber optic light facing Amplifier.
2.4.7 mportant notice for Audi owners.
In cases were GROM installed and MMI stereo does not pick up the GROM after installation then check MMI
software version as it may need to be updated to support MP3.
The GROM-MST4 emulates a MP3 CD changer.
For more information visit link: http://www.gromaudio.com/docs/audi_mst.pdf
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Chapter 3 – Testing the operation, simple usage guide
3.1 EXT1-EXT2 PORTS - Accessories Cables Connection
Connect the cables to the appropriate slots available on GROM-MST4 (see illustration).
EXT1- connect GROM Bluetooth Dongle, EXT2– connect GROM Bluetooth Dongle or AUX-In 3.5mm cable.
Note: You can connect GROM Bluetooth Dongle to either the EXT1 or EXT2, and AUX cable only to the EXT2.
3.2 Mode Selection
GROM-MST4 can work in these modes: USB or EXT2 (AUX)
3.2.1 MODE Selection for BMW non iDrive stereos
1. Press AUD O button and choose CDC to enter into GROM mode. It is usually USB by default, so if the USB flash drive with
the music is connected – the music will start playing.
2. To switch between USB and AUX (EXT2) you will need to do the following steps.
1. Press D SC 6 button and activate “Device Menu”
2. Press L ST button and enter into “Device Menu”
3. In the “Device Menu” you will see “Source: USB”. Using the tuning knob on the left navigate to “Source” and press
Tuning knob button on the right. The GROM will enter into AUXILIARY mode.
4. Repeat the same step to switch to back to USB Mode.
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3.2.2 Quick USB Stick Operation for BMW non iDrive stereos
1. Press > or < button to change tracks
2. Numeric pad will let you to switch between the Folders/Playlists
3. Press and hold > or < for Fast Forward or Rewind
3.2.3 MODE Selection for Mercedes Benz
1. Press AUD O button and choose CDC to enter into GROM mode. It is usually USB by default, so if the USB flash drive with
the music is connected – the music will start playing.
2. To switch between USB or AUX (EXT2) you will need to do the following steps:
-Switch to DISC 6 and Select TRACK 2. It will switch the MODE to the next. Do steps again to switch to the next MODE, order in
USB, AUX
***To distinguish which is current MODE for stereos with no text display capability, have the stereo already in CDC mode (GROM
Mode) -->press RADIO -->wait 1-2 second -->press CDC (GROM Mode).
You will hear the current Mode announce (USB or AUX).
3.2.4 Quick USB Stick Operation for Mercedes Benz
1. Press SEEK + or SEEK - button to change tracks
2. Numeric pad will let you to switch between the Folders/Playlists
3. Press and hold SEEK + or SEEK - for FF or Rewind
D SC 6 is GROM Menu:
Track 1 - BootLoader/Firmware Version
Track 2 - Change GROM Modes (USB and AUX)
Track 3 - Bluetooth Reset
Track 4 - Enable/Disable USB streaming
3.2.5 MODE Selection
for Volvo S40/S60/V50 and XC90 2007-2013 Single Disc Stereo
1. Press Mode/CD to enter GROM mode
2. You will be using Tuning knob to switch between modes (USB, and AUX).
TRACK 20 = USB Mode. Turn right Tuning knob >20 tracks to switch to iPod. TRACK 60 = AUX MODE (AUXILIARY
will appear on the display). Turn right Tuning knob > 20 tracks to switch to back to USB.
3. You may also switch between modes a simpler way: Press the EJECT BUTTON and it will jump between TRACK 20
and TRACK 60 without much effort. GROM will announce current mode.
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3.2.6 Quick USB Stick Operation
for Volvo S40/S60/V50 and XC90 2007-2013 Single Disc Stereo
1. Press < or > button to change tracks
2. Turn right Tuning knob <10 to change tracks.
3. Track Time shows FOLDER and TRACK number. Minutes = Folder / Seconds = Track Number
4. To change Folders/Playlists use Tuning knob. Turn Tuning knob 10-19 tracks to jump into the next Folder/Playlist
5. + 10-19 – NEXT Folder, - 10-19 – Previous Folder
3.2.7 MODE Selection Volvo S40/S60/V50 and XC90 2007-2013 6-Disc Stereo
1. Press Mode/CD to enter GROM mode 2. Use EJECT button to switch between MODES (USB, AUX).
GROM will announce current mode.
3.2.8 Quick button operation
for Volvo S40/S60/V50 and XC90 2007-2013 6-Disc Stereo
1. Press < or > button to change tracks
2. On the 6-CD stereos you can create up to 6 Folders/Playlists with unlimited number of tracks on your USB memory
device, Android device, iPod or iPhone. Each playlist will be assigned to the particular Disc button on the stereo.
3. Track title, time and number, Disc number will be shown on the stereo.
4. To change Folders/Playlists use Disc buttons on the stereo.
3.2.9 MODE Selection for Volvo XC90 2002-2006 6CD
1. Press CD button to enter GROM mode
Presses EJECT to switch between USB and AUX (EXT2). You will see the MODE name displayed on the car stereo
screen and GROM will announce current mode.
3.2.10 Quick USB Stick Operation for Volvo XC90 2002-2006 6CD
1. Press << or >> button to change tracks
2. Numeric pad will let you to switch between the Folders/Playlists (1-6 only)
3. Press and hold << or >> for FF or Rewind
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3.2.11 MODE Selection for BMW iDrive and Audi stereos
1. Using iDrive or MMI armrest control knob enter into CDC mode on your stereo. It is usually USB by default, so if
the USB flash drive with the music, iOS device or Android device with AALinQ app is connected – the music will
start playing.
2. To switch between USB and AUX (EXT2) you will need to navigate to Disc 6 while in CDC mode. On the screen
you will see Source. You will be able to switch source using the control knob on your armrest panel to select that
option.
3.2.12 Quick USB Stick Operation for BMW iDrive and Audi stereos
1. Press > or < button to change tracks
2. Use armrest control knob to change between folders or browse playlists, artists, albums on iOS or Android
device.
3.3 Installation Troubleshooting
Symptom Cause Remedy
Stereo is not recognizing
the GROM-MST4
adapter
12v Power and Ground connection may not
be pinned correctly
Optic Fiber light may be facing the wrong
direction
Make sure the power and Ground is pinned in correct
location by using illustrations and by using a
millimeters or slightly tighten the Posi-Tap connector
Look over the Fiber light arrow direction and make
sure it is facing the correct direction
No music is audible from
the MP3 player
The stereo is not in the CD changer mode Make sure CD changer is selected and make sure
you are on the correct MODE of the GROM
(correct key depends on your stereo)
For Volvo only:
Stereo is turning on and
off every couple of
seconds
MOST security may be on or fiber optic light
cabling may be going wrong direction
Double check the fiber optic light and make sure
direction is going right way and after the display unit.
If it is then MOST Security will have to be turned off.
For BMW only:
Stereo is not recognizing
the GROM-MST4
adapter
Power wire and Ground may not be in
correct location
Vehicle may not be coded correct to accept
CD changer
Make sure the power and Ground is pinned in correct
location by using illustrations and by using a
millimeters
Vehicle will have to be Retrofit/Coded to accept CD
changer
For Mercedes Benz
Only:
Stereo is not turning on
with GROM installed
GROM unit is installed between the Head unit
and Amplifier in the fiber-optic loop
Install the GROM unit in the fiber-optic loop after the
Amplifier
GROM installed seems
to be draining battery
GROM is installed to Switched
Ignition/Accessory power source instead of
12volt Constant power and not allowing the
rest of the Fiber-optic loop device to sleep
properly
Make sure to connect GROM unit to a 12volt
Constant power source
FOR COMPLETE USER MANUAL AND GU DEL NES PLEASE REFER TO THE USER MANUAL THAT CAME W TH YOUR NTERFACE. YOU
CAN ALSO CHECK FOR APPROPR ATE USER MANUAL AT GROM WEBS TE WWW.GROMAUD O.COM
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