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Pacific Accessory Corporation
Page 1
Rev: V5
Date:091218
Advanced Amplifier Interface for
General Motors
AP4-GM61
The AP4-GM61 provides 6-channel pre-amp outputs (front and rear, left and right, along with a center channel output
and non fading output for subwoofer output) for use with aftermarket audio equipment. Using the full range, fixed
level head unit output, in conjunction with MOST, the AP4-GM61 delivers variable 5v RMS pre-amp outputs with fading,
balance, equalization, and level control capabilities. The module also retains all audio from other vehicle features such
as factory navigation prompts, Bluetooth, OnStar, parking sensor chimes, safety alerts, reminders and infotainment. A
data controlled remote amplifier turn on wire is also provided by the AP4-GM61.
The module also provides a variable
2-channel fiber optic digital audio output (TOSLINK).
Introduction and Features
Important Notes
1. This interface is only compatible in vehicles equipped with both Bose and the IO5 or IO6 8" radios. To verify the "IO" RPO
code on your vehicle, check the glove compartment for a silver sticker with these codes. If this sticker is not present, you
must scan the QR code on the GM label found in the driver's door jamb. The RPO codes will be listed in alphabetical order
in either scenario.
2.
The factory amplifier must remain in the vehicle, and connected, after 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 will be active whenever the vehicle's CAN-bus network is active (example: if the doors are unlocked
from keyfob). Even if the radio is not on, the remote output may be active. The remote output will turn off once the vehicle's
CAN-bus network goes to sleep. To verify, turn the ignition off, close all doors, and wait 5 minutes, then check if the
amplifier is on
without opening the vehicle's doors, trunk or tailgate.
5. Channel 5 is a variable volume, center channel output, and is derived from the in phase audio from the left and the right
channels. The center channel output level can be adjusted using the AmpPRO PC application. Please refer to the Setup
and Configuration section on page 3 for more details.
6.
Channel 6 is a non-fading output (typically used for subwoofers). The output level of channel 6 can be adjusted at any time
using the supplied level control knob.
7.
When the non-fading level control knob is not connected to the AP4-GM61, the output level of channel 6 will always be at
maximum.
8. The level control knob must be connected in order to manually adjust the chime volume and minimum volume settings.
9.
The chime level in the radio's settings menu will not affect the chime level output from the AP4-GM61. Any chime audio
provided by the AP4-GM61 requires the chime level adjustment to be done using the procedure provided in the Setup and
Configuration section. If the factory amplifier is being used for the front or rear speakers, the chime level for the factory
amplified speakers must be adjusted in the radio's settings menu. In some cases, it is necessary to adjust the chime level
through the radio settings menu as well as through the AP4-GM61. For example: If the AP4-GM61 outputs are only being
used on the front speakers, and the vehicle has rear parking sensors, adjustments would be made through the radio
settings and through the AP4-GM61. In this instance the rear parking sensor chime level would be adjusted through the
radio settings menu (since the reverse chimes play through the rear speakers), and any chimes coming through the front
speakers would need to be adjusted via the AP4-GM61.
10.
By default,the chime volume is set to 60 percent (adjustable in 5 percent increments from 0 to 100) and minimum volume
is set to 0 db (adjustable in 2 db increments -20 db to +20 db). If you are happy with these levels in your particular
application, then no further adjustment is necessary. Please refer to the Setup and Configuration section on page 3 for
more details.
11.
The factory radio's speed controlled volume and surround sound modes are not supported by the AP4 outputs.
12.
When using the TOSLINK output, all chimes must be routed through the front output by setting DIP switch 1 on (down).
13.
No adjustments can be made manually using the programming button, or the factory SWC when the module is connected
to a PC.
14.
If the aftermarket amplifier requires 2 channels of input from the non-fading, channel 6 output of the AP4-GM61, an RCA
"Y" adapter is required.
