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APSUB-FD21
Module Layout
Interface Connector 1
Expansion Port
Programming Button
USB Connection
Installation
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.
No Function
1 2 3 4
DIP
ON
* See troubleshooting section on page 5 for more details
1. Remove factory radio and LCD screen.
2. Disconnect the 52-pin harness from the LCD screen and the 24-pin harness from the radio.
3. Connect APSUB harnesses to vehicle harnesses.
4. Connect APSUB harnesses to LCD screen and factory radio.
5. Set any feature DIP switches that apply to your install.
a. Set DIP switch 2 on (down) to lower the RCA output voltage to 4v. Leave DIP switch 2 off (up) to keep the RCA output
voltage at 5v.
b. DIP switch 1 is not used. DIP switches 3 and 4 are used for additional troubleshooting. (See page 5 for more details).
6. Connect the APSUB harness to the module.
7. Connect the level control knob to the module and install in an accessible location.
8. After the aftermarket amplifier power/ground connections are made, connect the signal cables and remote input from the
aftermarket amplifier to the APSUB.
9. Reconnect any additional harnesses removed from the radio and reinstall the radio.
Setup and Configuration
1. Turn the ignition on. LED 1 on the interface will turn on and the +12v remote output will turn on.
2. Set the amp gain(s) to the desired level. We recommend using an oscilloscope and test tones to set the amp gain(s).
Please refer to the MECP Advanced study guide (p. 360) if you are unfamiliar with this process.
3. Check volume, balance, fade and EQ settings.
4. If you would like to adjust the minimum volume, do so using one of the methods outlined below. If you are happy with the
default level, no adjustments are necessary.
Manually Setting the Minimum Volume
If the minimum volume of the radio (factory radio volume level 1) is too loud, you can manually set the level of the minimum
volume using either the programming button on the side of the interface or the factory SWC. If you would like to set the
minimum volume using the AmpPRO app, please proceed to the AmpPRO App section.
Pacific Accessory Corporation
Feature Select
DIP switches
Non-Fading Level Control
Knob Connection
5v / 4v Preout
1
© 2020 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
Advanced Subwoofer Amplifier Interface
Troubleshooting*
2
3
PAC-Audio.com
for Select Ford Vehicles
LED 1
LED 2
Subwoofer Output
Troubleshooting*
4
Rev: V1
Date: 091120
Page 2
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