GROM Audio GROM-MST4 Install Manual
GROM-MST4
MP3 USB Android iPhone/iPod/iPad car stereo adapter kit
For fiber-optic stereos
Optional Bluetooth and AUX-In extensions
INSTALL MANUAL
SUPPORT: HTTP://GROMAUDIO.COM/SUPPORT.HTML
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Copyright © GROM Audio, 2015
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TABLE OF CONTENTS
Chapter 1 – Introduction
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 Installation
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.19
3.2.7 Mode selection for Volvo S40/60, V50, XC90 07-13 6-Disc CD p.19
3.2.8 Quick USB operation for Volvo S40/60, V50 XC90 07-13 6-Disc CD p.19
3.2.9 Mode selection for Volvo XC90 02-06 6-Disc CD p.19
3.2.10 Quick USB operation for Volvo XC90 02-06 6-Disc CD p.19
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 - Introduction
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-IN 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 Android 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 Audio, AUX-IN Features (with GROM
Bluetooth Dongle or AUX 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 Installation
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 AUDI:
- 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.
If 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 (Installation 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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Image 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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