GROM Audio USB2P User Manual
GROM-USB2P MP3 car stereo adapter kit
TABLE OF CONTENTS
Chapter 1 – Introduction
1.1 Subject p.2
1.2 Functionality Highlights p.2
1.3 Main Features in USB and Android® phone Mode p.2
1.4 Main Features in iPod®/iPhone® Mode p.2
1.5 Bluetooth Hands Free and Wireless, AUX-IN p.2
1.6 Precautions p.2
1.7 Disclaimer p.3
1.8 Completeness and connection of set p.3
1.9 Important Compatibility Notes p.4
1.10 EXT1/EXT2 ports p.4
Chapter 2 – General Installation
2.1 General Installation p.4
2.2 Tools needed p.4
2.3 Preparation and adapter installation p.5
2.4 Installation Troubleshooting p.6
Chapter 3 – Usage manual
3.1 Different MODES of GROM-USB p.7
3.2 Android Device Operation p.8
3.2.1 Android Setup and Operation p.8
3.2.2 Android Operation Troubleshooting p.8
3.3 Operation in USB Mode p.9
3.3.1 Supported USB Storage Devices p.9
3.3.2 Supported formats p.9
3.3.3 Directories Setup p.10
3.3.4 Basic Features p.11
3.3.5 Detailed operation instructions p.12
3.3.6 USB Operation Troubleshooting p.12
3.4 iPod/iPhone Mode Operation p.12
3.4.1 Simple Mode p.13
3.4.2 Advanced Mode p.13
3.4.3 Playlist set up for advanced mode p.14
3.4.4 When car ignition is OFF p.14
3.4.5 Troubleshooting p.14
3.5 AUX Mode -- AUX-IN or Bluetooth Operation p.15
3.5.1 AUX-IN input p.15
3.5.2 Bluetooth Dongle p.15
Chapter 4 – Support p.15
Chapter 5 – Warranty, license and disclaimer p.16
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Chapter 1 – Introduction
1.1 Subject
Thank you for purchasing the GROM-USB2P adapter. It has been designed to provide endless hours of listening
pleasure through most vehicle factory stereos. To ensure that your GROM-USB2P 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 (most supported) play, charge and control through USB port via standard USB cable.
- iPod®/iPhone® play, charge and control via additional IPod cable (sold separately).
- 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 or Android Phone Mode
- Ability to listen to songs in car on USB mass storage device (such as flash drive) 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 (different for SAT emulation –
please refer to your installation manual). Play lists on Android phone are mapped to Discs.
- Number of “Discs” limited to the car stereo (up to 99 on select stereos).
- Last listened song position within the Playlist is remembered and time position is restored upon ignition cycle.
- Android phone is charged while in car.
1.4 Main Features in iPod/iPhone Mode
- Ability to play, charge and control iPod/iPhone – all using your factory car stereo.
- Playlists on the iPod/iPhone are mapped to an individual “Disc” button on car stereo’s dashboard (different for SAT emulation –
please refer to your installation manual).
- Number of “discs” limited to the car stereo (up to 99 on select stereos)
- Last listened song position within the playlist is remembered (may not apply to some iPod)
- Last listened song time position is restored upon ignition cycle (may not apply to some iPod)
1.5 Bluetooth Hands Free and Wireless Audio, AUX-IN Features
- 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).
- AUX-IN 3.5mm audio connector for any audio source, and additional 5V charging port.
1.6 Precautions
Proper mounting location securely installs 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)
1.7 Disclaimer
- This product is not affiliated with any of the OEM manufacturers
- Modifying the stereo may void any existing warranty
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- 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
1.8 Completeness and connection of set
a) The GROM audio adapter set consists of the GROM-USB main interface, one USB cable, and one vehicle-specific cable.
1. GROM USB2P interface 2.One USB 3FT cable 3. One Vehicle specific cable
Figure 1. Package contents
b) The basic package does not include the optional accessories that you can purchase separately:
GROM compatible iPod cable AUX MiniDin 3.5mm USB charge cable GROM Bluetooth Dongle
Figure 2. Optional Accessories (sold separately)
c) The basic wiring diagram of the GROM Audio adapter is detailed in Figure 3 (some installs may differ):
Figure 3. Basic wiring diagram.
V.4.2.1 3
1.9 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, Bluetooth or MP3 player.
The built-in CD changer will remain operational. SAT if present may need to be disconnected in some case.
- If your vehicle has factory SAT and GROM adapter is using SAT emulation, you must disconnect factory SAT to gain the use of
your USB device, iPod, Bluetooth or MP3 player. This is applicable to Nissan/Infinity with SAT emulation, Honda/Acura 03 and up
with SAT emulation, Ford/Lincoln/Mercury, Mazda 3,5 08-09 and Subaru 07-09. 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.
1.10 EXT1/EXT2 ports
Please refer to the picture below for the proper connection of the accessories to the EXT1/EXT2 ports on GROM-USB2P module.
Figure 4. EXT ports, accessories connection.
Chapter 2 – General Installation
2.1 Installation location
Most installations will require removing the factory stereo in order to plug in the vehicle- specific 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 special tools required in order to remove the stereo. For some stereos (e.g., VW, Audi), 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 recommend contacting your local car stereo shop for
assistance. Some installation examples can be found at www.gromaudio.com.
V.4.2.1 4
2.3 Preparation and adapter installation
1. Turn off car engine and remove key from ignition
2. If your stereo uses a Security Code, make sure that you have the code before unplugging the stereo.
3. Remove your stereo from the dash in order to gain access to the back of the stereo. Some vehicles require special tools to
remove the stereo. 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 secure connection with
no bent pins, 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 5) that you will need to attach to the back bolt of the car
stereo or the stereo chassis stereo.
Figure 5. VW/Audi/Seat/Skoda Connection Scheme
Remove the PVC from the end of the black wire (2)
• 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
• 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 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/docs/grom-audi-how-to.html for more information.
6. For BMW, Ford, Nissan, Infiniti, Volvo, Mazda 08-12 vehicles only: Please refer to the installation insert for the special
guidelines for BMW, Ford, Nissan, Volvo and Mazda installation.
7. For Toyota and Honda (03 and up) vehicles:
On some Toyota/Lexus/Scion vehicles and Honda/Acura (03 and up) vehicles, the CD changer port is occupied by a factory
harness (such as NAV or audio harness). The GROM package for Toyota and for Honda/Acura (HON1) includes a Y-shaped
vehicle cable. In order to connect the interface properly, please refer to Figure 5. If stereo port is already empty, simply plug
GROM cable into stereo.
V.4.2.1 5
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