PAC AP4-CH31 Quick Start Manual Download Page 4

PAC

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©2017 PAC | PAC is a Power Brand of AAMP Global

www.pac-audio.com

Rev. 020717

Page 4

Pacific Accessory Corporation

Advanced Amplifier Interface for 

Select Chrysler / Dodge Vehicles

AP4-CH31

AmpPRO PC App (cont.)

Firmware Updates

The AmpPRO app will also allow you to update the interface with new firmware as it becomes available. Please visit www.pac-

audio.com or contact our tech support department to see if there is a firmware update for your interface.

Connect the interface to your PC and select "Firmware", then “Update Firmware”. Now select “Select File”. Finally, browse to the 

place where you saved the file and select it. This will begin the updating process. Once finished, disconnect the interface from 

the PC and resume normal operation.

Restoring Factory Settings

You can restore the interface to factory default settings by pressing and holding the programming button on the side of the module 

until the status LEDs start blinking red. Once the LEDs start blinking red, release the button.

This reset will restore the following settings to their factory defaults:

•  Minimum volume level

• 

Enable / Disable factory EQ

•  Factory EQ frequency

•  Factory EQ Q factor

Troubleshooting

1. 

Hiss at high amp gain - Set feature DIP switch 2 to the on (down) position to lower the output voltage of the AP4 to 4v. If you 

still hear the hiss, lower your amp gains until the hiss is gone.

2. 

Cannot hear uConnect or nav voice - Use the volume knob while either of these voice prompts are active to adjust voice 

volume. 

3. 

Low volume setting on radio is too loud - Set minimum volume using process outlined in Setup and Configuration or using the 

AmpPRO application.

4. 

If for any reason the AmpPRO module becomes unresponsive, or will not power up with the key on, you can always reset the 

interface by turning the key to the ignition position, then pressing and holding the Power button on the factory radio for 12 

seconds until a tone is heard.

Action / Color

During Normal Operation

Solid Red

Module Active

Solid Green

Chime Volume Adjustment Mode

Solid Amber

Minimum Volume Adjustment Mode

Rapid Blink Any Color

DSP Activity

LED2

Blink Amber

USB Connection Detected

Both LEDs

Alternate Blinking Red Performing Memory Reset

LED Legend

LED 1

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