PAC AP4-GM81 Bruksanvisning
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Rev: 1
Date:7/16/25
Advanced Amplier Interface for
General Motors
AP4-GM81
The AP4-GM81 provides a 6-channel pre-amp output for use with aftermarket audio equipment. The AP4-GM81
delivers a variable 5v RMS pre-amp output with fading, balance, equalization, and level control capabilities. The
module retains all audio from other vehicle features such as factory navigation prompts, Bluetooth, OnStar, and
parking sensor chimes. A data controlled remote amplier turn on wire is provided by the AP4-GM81. The module
provides a variable 2-channel ber optic digital audio output (TOSLINK).
Introduction and Features
Important Notes
1. This interface is only compatible in vehicles with a BOSE factory amplier (RPO code UQA or UQS).
2. The factory amplier must be disconnected removed from the vehicle when the AmpPRO has been installed.
3. The remote output is rated at 2A of current. If more current is needed, an external relay must be used.
4. The remote output is active any time the vehicle data bus is active. Any vehicle interaction like opening a door or pressing a
button on the key fob will activate the data bus.
5. Channel 5 & 6 are non-fading outputs. The output level of channels 5 & 6 can be controlled using the supplied level control
knob.
6. When the non-fading level control knob is not connected to the AP4-GM81, the output level of channels 5 & 6 will default to
100 percent.
7. To adjust minimum volume without using the PC APP, the level control knob must be connected.
8. While adjusting the minimum volume with the USB cable plugged in, the level control knob will not function.
9. To adjust chime volume, the PC APP must be used.
10. Chime volume (Front & Rear) can be adjusted through OE Radio under "Settings > Vehicle > Comfort and Convenience >
Chime Volume." Before making additional chime volume adjustments with the PC APP, set the OE volume to the middle.
11. The chime volume and minimum volume levels are set to a typical level by default. If you are happy with this level in your
particular application, then additional adjustment is not required. Please refer to the Setup and Conguration section on
page 4 for more details.
12. Front and rear chimes are independently adjustable to compensate for difference in power levels between front and rear
installs.
13. The factory radio's speed controlled volume and surround sound mode are not supported by the AP4 outputs.
14. When using the TOSLINK output, all chimes must be routed through the front output by setting DIP switch 1 ON (down).
15. No adjustments can be made manually using the programming button, or the factory SWC, when the module is connected
to a PC.
16. The AP4-GM81 is designed to be installed in the factory amplier location, NOT behind the radio. It will replace the factory
amplier which will no longer be used.
Installation
DIP
1 2 3 4
ON
Two Channel Mode 5v / 4v Preout No Function No Function
1 2 3 4
Set DIP switches to the ON position to activate the corresponding features.
Set DIP switches to the OFF position for any features that are not desired.
Module Layout
Interface Connector 1
Expansion Port
Programming Button
Feature Select
DIP switches
Non-Fading Level Control
Knob Connection
USB Connection
LED 1
TOSLINK Output
Front Output
Ch. 1(L) and 2(R)
Rear Output
Ch. 3(L) and 4(R)
SUB (Non-Fading)
Ch. 5 and 6
LED 2
Produktspecifikationer
| Varumärke: | PAC |
| Kategori: | mottagare |
| Modell: | AP4-GM81 |
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