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Bluetooth Audio System
User’s Manual
REVISION HISTORY
Scope
This document outlines the function of the Bluetooth Audio System. Only a qualified engineer
or technician should follow the instructions provided in this document. This document is not
intended to be used by the end user of this product.
System Specifications
The Bluetooth Audio System is powered by the vehicle 12V power system.
The system connects to a user’s phone that is capable of Bluetooth 5.0
The audio amplifier provides a maximum of 50W RMS x 2 channels
Speakers consist of a 5” low-frequency driver and a tweeter per channel
Rev
Section
Description
Date
By
01
All
Initial Release
May 12, 2026
Erik Larsen
02
All
Updated to reflect full system
May 22, 2026
Chris Glassman
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Connectors
Electrical Specifications
Audio input: Bluetooth only
Bluetooth revision: 5.0
Audio channels: 2
Amplifier output power: 50W RMS maximum
DC operating range: 7-17VDC
Current draw: 10A peak
Bluetooth Audio System User Interface
The Bluetooth Audio System user interface includes:
1. 5 Buttons
2. 5 LEDs (one for each button)
4
2
3
1
5
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Buttons will be used to control the Bluetooth Amplifier
LEDs will provide information about the status/state of the Bluetooth Amplifier
Button Positions
1
2
3
4
5
Power/Play/Pause
Previous Track
Next
Track
Volume Down
Volume Up
Key Press Functions
Keypad Layout and Functions
Button
Position
Functions
Short Press
Long Press
Combined Press
1
Play/Pause
2 seconds: Power ON
4 seconds: Power OFF
N/A
2
Skip Back
Fast Rewind
N/A
3
Skip Forward
Fast Forward
4
Volume Down
2 seconds: 20% Volume
1 Second: Enter or Exit Pairing (pairing
toggle)
6 seconds: Clear Paired Devices
5
Volume Up
2 seconds: 100% Volume
User Interface Definition
Power ON
Power ON when vehicle power is supplied
Power ON when button #1 is pressed down for 2 seconds
Automatically sets the volume to 30% upon power ON
Power OFF
Power OFF when 14.4V is removed
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Enter standby mode when button #1 is pressed down for 4 seconds
Automatically enter standby mode after 5 minutes if no devices are connected
Pairing
Enter pairing mode upon first power ON when there are no known paired devices
Reconnect to the last connected device upon power ON
Enter pairing mode if no device successfully connects within 30 seconds
Exit pairing mode if no device connects within 2 minutes
Keypad
Backlight
Backlight is ON when the unit is powered ON or in standby mode
Backlight flashes rapidly (3 Hz) in pairing mode
Audible Tone
Audible tone shall confirm unit powering ON
Double tone (low then high frequency (300/400Hz 150ms)) indicates successfully
paired/connected device
Double tone (constant frequency (500Hz 100ms) indicates 100% volume level reached.
Audio playback is reduced to 85% volume when tone is playing
Quadruple tone (high to low frequency (500/400/300/200Hz 50ms)) indicates paired
devices have been deleted
Note:
This device complies with Part 15 of the FCC Rules [and contains license-exempt
transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development
Canada’s license-exempt RSS standard(s)].
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause
undesired operation of the device.
L’émetteur/récepteur exempt de licencecontenu dans le présentappareilestconforme aux
CNR d’Innovation, Sciences et Développementéconomique Canada applicables aux
appareils radio exempts de licence.L'exploitationestautorisée aux deux conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'appareil doit accepter tout brouillageradioélectriquesubi, mêmesi le brouillageest
susceptible d'encompromettre le fonctionnement.
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This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
CAN ICES-003 (B) / NMB-003 (B)
Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with minimum distance of
20 cm between the radiator and your body. This transmitter must not be co-located or
operating in conjunction with any other antenna or transmitter.
“This equipment complies with IC RF radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with a minimum distance of
20 centimeters between the radiator and your body.”
“ce matériel est conforme aux limites d'exposition aux rayonnements rf de ic énoncés dans
un autre environnement. ce matériel doit être installé et exploité à une distance minimale
de 20 cm entre le radiateur et votre corps."
Warning
To assure continued compliance, any changes or modifications not expressly approved by
the party responsible for compliance could void the user’s authority to operate this
equipment.
Resolution 680 statement, below, must be placed in an easily visible place in the product, or
in the user manual:
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• Regulamento Anatel sobre equipamentos de Radiocomunicação de Radiação Restrita
(Resolução nº 680): “Este equipamento não tem direito à proteção contra interferência
prejudicial e não pode causar interferência em sistemas devidamente autorizados – Para
maiores informações, consulte o site da Anatel – https://www.gov.br/anatel/pt-br/"
