GROM Audio GROM-USB2 MP3, GROM-USB2 User Manual
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GROM-USB2 MP3 car stereo adapter kit
Chapter 1 – Introduction
1.1 Subject
Thank you for purchasing the GROM-USB2 adapter, which has been designed to
provide endless hours of listening pleasure through most vehicles’ factory radio. To
ensure that your GROM-USB2 interface performs correctly in your car or truck, we
recommend that you read this entire manual before attempting to install the GROM
interface.
1.2 Functionality highlights
The GROM-USB2 car adapter allows you to 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. This
adapter further allows you to listen to your favorite music directly from any mass storage
USB stick or hard drive, requiring no dedicated portable player. GROM-USB2 also has
additional AUX and iPod inputs, allowing you to connect any additional audio source and
iPod / iPhone.
1.3 Main Features
- Ability to manage a significant number of songs based on the memory of the USB
disk/flash stick
- Folders or Playlists on the USB drive are mapped to an individual “Disk” button on car
stereo’s dashboard
- Number of “disks” limited to the car stereo (up to 99 on select stereos)
- Last listened song position within the playlist is remembered
- Last listened song time position is restored upon ignition cycle
1.4 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)
1.5 Disclaimer
• This product is not affiliated with any of the OEM manufacturers
• Modifying the radio may void any existing warranty
• The purchase of this product carries no warranties, either expressed or implied
• Although every care has been taken to provide a quality product, we cannot
guarantee that the GROM USB adapter will function correctly if installation is not
done according to the instructions included in this guide. Furthermore, we cannot
guarantee the GROM USB adapter to function correctly with a USB device that is
broken, damaged, or not supported
• 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 radio during installation, and the illegal use of the radio
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1.6 Completeness and connection of set
a) The GROM audio adapter set consists of the GROM-USB2 interface, one USB cable,
and one vehicle-specific cable with optional accessories.
1. GROM USB interface 2.One USB cable 3. One Vehicle specific cable
Figure 1. Package contents
b) The basic wiring diagram of the GROM Audio adapter is detailed in Figure 2:
BACK OF THE CAR RADIO
CD PORT
GROM Interface
Data cable
USB cable
USB Stick / card
USB
MP3 player, iPod
Audio cable
Figure 2. Basic wiring diagram.
1.5 Important Compatibility Notes
If your vehicle is equipped with an external factory CD changer, you must disconnect it in
order to be able to install the GROM interface. You will lose the use of the external CD
changer to gain the use of your USB device, iPod, or MP3 player. The built-in CD
changer will remain operational. For a full version of the GROM compatibility guide,
please visit http://gromaudio.com/grom_application_guide.pdf or contact GROM Audio at
http://gromaudio.com/support.html.
Chapter 2 – General Installation
2.1 Installation location:
Most installations will require removing the factory radio in order to plug in the vehiclespecific harness. For some vehicles, you will also have the option to connect the
interface to the factory pre-run CD changer cable located in the trunk or glove box.
2.2 Tools needed:
In most cases, there are no any special tools required in order to remove the stereo. For
some stereos (e.g., VW, Audio), it is better to use car stereo removal tools. 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
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Vehicle harness (1)
Black wire (2)
Bolt (3)
recommend contacting your local car stereo shop for assistance. Some installation
examples can be found at www.gromaudio.com.
2.3 Preparation and adapter installation
1. Turn off car engine and remove key from ignition
2. If your radio uses a Security Code, make sure that you have the code before
unplugging the radio.
3. Un-mount your radio from the dash in order to gain access to the back of the radio.
Some vehicles require special tools to remove the radio. Please consult your
vehicle’s dealership or a local car audio professional, if necessary.
4. Attach the car harness connector to the CD changer port in the back of the stereo.
Be sure to make a firm connection, but do not force it. Connect the other end to the
interface.
For VW/Audi/Seat/Skoda with dashboard cable only: There is a black single
cable on the vehicle-specific harness (Figure 3) that you will need to attach to the back
bolt of the car stereo or the stereo chassis (see Error! Reference source not found.).
Figure 3. VW/Audi/Seat/Skoda Connection Scheme
Remove the PVC from the end of the black wire (2)
(a) Connect the end of the black wire (2) to the metal part of the car stereo
chassis. You can connect it under the bolt (3) if it is present
(b) Make sure that solid contact is made between the striped black wire and the
metal part of the car stereo body.
Note: Failure to attach the black cable to the chassis of the stereo will result in the
GROM adapter not working! All of the specified vehicles require this black cable to
be attached.
5. For For Audi vehicles only: Some Audi head units require an additional part (AUDS
cable) or harness modification to gain the access to the CD changer port. A solid 20-pin
connector occupies the 8-pin CD changer port on such stereos. Please refer to the
instructions at http://gromaudio.com/pie-audi-how-to.html for more information.
6. For BMW vehicles only: Please refer to the installation insert for the special
guidelines for BMW installation.
7. For Toyota vehicles only:
On some Toyota/Lexus/Scion vehicles, the CD changer port is occupied by a factory
harness (such as NAV or audio harness). The GROM package for Toyota includes a Yshaped vehicle cable. In order to connect the interface properly, please refer to Figure 4.
Note: On most Lexus, Toyota, Honda, and Acura cars, initial recognition of the
device requires turning the ignition off and then on. This has to be done just once.
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