AP4-TY13 - Audio Amplifier PAC - Free user manual and instructions

Product Type	Vehicle Audio Interface Module
Brand	PAC
Model	AP4-TY13
Number of Pre-amp Output Channels	6 (3 pairs: Front, Rear, Non-Fading)
RCA Output Voltage	5V RMS (selectable to 4V via DIP switch 2)
Remote Turn-On Output	2A max
Input	Factory radio full-range fixed level signals via data bus
Supported Features	Fading, balance, equalization, level control, navigation prompts, Bluetooth, voice activation, factory beeps
Compatible Vehicles	Toyota with factory amplifier and 24-pin/30-pin harnesses
Included Components	AP4-TY13 module, harness, non-fading level control knob
Optional Accessory	APA-TOS1 (TOSLINK fiber optic output)
Power Supply	12V DC from vehicle ignition
Current Consumption	Not specified; typical low current
Dimensions	Approx. 3 x 2 x 1 inches (module)
Weight	Approx. 0.25 lbs
Installation Location	Near factory amplifier under left front seat (Toyota)
Warranty	Not specified
Certifications	Not specified
Firmware Update	Via USB and PC app (AmpPRO)
Cleaning	Not required; keep away from moisture
Safety	Install with ignition off; secure wiring; avoid shorts
Repairability	No user-serviceable parts; contact PAC support

Frequently Asked Questions - AP4-TY13 PAC

What vehicles is the PAC AP4-TY13 compatible with?

The AP4-TY13 is designed for Toyota vehicles equipped with a factory amplifier and using 24-pin and 30-pin harnesses. It retains factory features like navigation prompts, Bluetooth, and voice activation.

What is the output voltage of the RCA pre-outs?

Default is 5V RMS. You can lower it to 4V RMS by setting DIP switch 2 to the ON position (down).

How do I set the beep volume (chimes) manually?

Turn the level control knob fully counter-clockwise, press the programming button, then turn the knob clockwise until the desired beep volume is heard. Exit by pressing the button twice or waiting 10 seconds.

How do I adjust the minimum volume level when radio volume is set to 1?

Set amp gains, turn radio volume to 1, turn level control knob down, press programming button twice (LED turns amber), then turn knob clockwise until desired minimum volume is reached. Press once or wait 10 seconds to exit.

What do the DIP switches do?

Switch 1 enables two-channel mode (TOSLINK and front RCA become non-fading). Switch 2 lowers RCA output to 4V. Switch 3 adds +8 dB input boost if output is too low. Switch 4 is unused.

How can I update the firmware?

Download the AmpPRO app from http://aampglobal.com/appdownloads. Connect the module to your PC via USB, open the app, go to Firmware > Update Firmware, select the file, and follow instructions.

Why is there no audio after installation?

Check if LED 1 is solid red. If not, cycle the ignition off and on. Ensure all harness connections are secure and the remote turn-on wire is connected to your amplifier.

Can I use the AP4-TY13 with an aftermarket amplifier and keep the factory SOS system?

Yes, refer to the Tech Brief 'AP4-TY SOS Retention' at PAC-audio.com. The Yellow/Black connections are not needed with this module.

How do I reset to factory defaults?

Press and hold the programming button until both LEDs blink red. Release; settings like beep volume, minimum volume, and EQ will be restored.

How do I connect speaker wires from the aftermarket amplifier?

Cut the speaker wires between the AP4 harness and the OEM amplifier side. Insulate the OEM amp side, then extend wires from your amplifier to the corresponding AP4 harness wires using the pinout table in the manual.

USER MANUAL AP4-TY13 PAC

Introduction and Features

The AP4-TY13 provides a 6-channel pre-amp output for use with aftermarket audio equipment. Using the full range, fixed level head unit output, in conjunction with data bus messages, the AP4-TY13 delivers a variable 5v RMS pre-amp output with fading, balance, equalization, and level control capabilities. The module also retains audio from other vehicle features such as factory navigation prompts, Bluetooth and Voice Activation. An accessory controlled remote amplifier turn on wire is also provided by the AP4-TY13. When used in conjunction with the APA-TOS1 (sold separately), the module can provide a variable 2-channel fiber optic digital audio output (TOSLINK).

Important Notes

1. Toyota Safety Connect (SOS) can easily be retained. See the Tech Brief "AP4-TY SOS Retention" at PAC-audio.com for detailed instructions.
2. The factory radio's speed controlled volume, DSP, and surround sound mode are not supported by the AP4 outputs.
3. The factory amplifier must remain connected, and in the vehicle after the AmpPRO has been installed.
4. Prior to testing, cycle the ignition off and back on again to properly initiate the AP4-TY13.
5. The radio's beep setting must be enabled on the factory radio in order to hear the audible tones when making selections through the radio.
6. Initially, if the beep through the AP4-TY13 does not match the on / off selection through the radio, cycle the beep to the opposite setting and back, then test again.
7. The radio's beep volume and minimum volume levels are set to 0 dB by default. If you are happy with this level in your particular application, additional adjustment is not required. Please refer to the Setup and Configuration section on page 4 for more details.
8. The Radio's Nav / VR Voice, incoming E-mail tone, Ringtone, In-Call, Incoming SMS / MMS tone and Incoming SMS Voice volumes can be adjusted through the radio's settings menu as they were prior to installation of the AP4-TY13.
9. The remote output is rated at 2A of current. If more current is needed, an external relay must be used.
10. Channels 5 and 6 are non-fading outputs. The output level of channels 5 and 6 can be controlled using the supplied level control knob.

Wiring Connection Chart

graph TD
    A["24-pin"] --> B["AP4-TY13-HAR"]
    C["30-pin"] --> B
    D["To Amp"] --> B
    B --> E["Remote Turn On Output (2A Max)"]
    B --> F["To Amp Harness"]
    G["PAC"] --> H["Non-Fading RearFront"]
    H --> I["1(L) 2(R) 4(R) 5(L) 6(R)3(L)"]
    H --> J["Non-Fading Level Control Knob"]
    K["To Aftermarket Amplifier"] --> L["1(L) 2(R) 4(R) 5(L) 6(R)3(L)"]

Module Layout

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.

Two Channel Mode	5v / 4v Preout Troubleshooting Not Used
1 2 3 4

1. To gain access to the amplifier, reposition the left front seat forward and to the highest position.
2. Locate the factory amplifier cover, remove the 3 push pins that secure the cover into place, and remove the cover to gain access to the amplifier (Fig. 1).
3. Disconnect the 30-pin harness and the 24-pin harness from the amplifier. To unplug the 30-pin, you must press the inner release tab and pull the connector's outer release tab at the same time (Fig. 2).
4. Connect the AmpPRO harnesses to the vehicle harnesses.
5. Connect the AmpPRO harnesses to the factory amplifier.
6. Set any feature DIP switches that apply to your install.

a. DIP switch 1 is used for two channel mode. In this mode, both the TOSLINK and front RCA outputs (1 and 2) become non-fading outputs.
b. 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. See troubleshooting section on page 6 for more details.
c. Set DIP switch 3 on (down) only if the output of the AP4 is too low. Doing this will give you a +8 dB boost on the INPUT of the module.
d. DIP switch 4 is not used and should remain off (up).

1. If you are using the APA-TOS1 (sold separately) refer to the instructions included with that product for its installation.

2. Connect the AmpPRO harness to the module.

3. Connect the level control knob to the module and install in an accessible location.
4. Connect the signal cables and remote input from the aftermarket amplifier.
5. Initially, if the beep through the AP4-TY13 does not match the on / off selection through the radio, cycle the beep to the opposite setting and back, then test again.
6. See the Tech Brief "AP4-TY SOS Retention" at PAC-audio.com for detailed instructions for retaining SOS. The Yellow / Black connections are not necessary when using the AP4-TY13.

Close-up of a car engine compartment with red-circled features and a small metallic component, labeled 'Fig. 1' (no readable text or symbols beyond label)

Installation (cont.)

Speaker Connections to Aftermarket Amplifier

The AP4-TY13 harness speaker wire outputs are able to be utilized for connecting the aftermarket amplifier to the existing speakers.

1. Using the wiring diagram and information below, cut the speaker wires that will be used between the AP4-TY13 30-pin connector that plugs into the OEM amplifier and the 30-pin connector that plugs back into the OEM harness.
2. Insulate the cut wires on the amplifier side of harness.
3. Extend speaker wires from the aftermarket amplifier outputs and connect them to the appropriate wires in the AP4-TY13 harness.

30-Pin AP4-TY13 Harness - Side that Connects to OEM Harness

Connector Viewed From Wire Side

Pin Number	Wire Color	Wire Description	Label
8 Blue Subwoofer Speaker	2 Positive (SW2+)		Subwoofer 2
23 Blue / Black Subwoofer	Speaker 2 Negative (SW2-)
9 Green Left Rear Speaker	Positive (LR+)		Left Rear Speaker
24 Green / Black	Left Rear Speaker Negative (LR-)
10 Purple Right Rear Speaker	Positive (LR+)		Right Rear Speaker
25 Purple / Black Right Rear Speaker	Negative (LR-)
11 White	Left Front Mid Positive (LF+)		Left Front Midrange
26 White / Black	Left Front Mid Negative (LF-)
12 Gray / Red	Right Front Tweeter Positive (RFTW+)		Right Front Tweeter
27 Gray / Blue	Right Front Tweeter Negative (RFTW-)
13 Brown / White	Subwoofer Speaker 1 Positive (SW1+)		Subwoofer 1
28 Brown / Black Subwoofer	Speaker 1 Negative (SW1-)
14 White / Red	Left Front Tweeter Positive (LFTW+)		Left Front Tweeter
29 White / Blue	Left Front Tweeter Negative (LFTW-)
15 Gray	Right Front Speaker Positive (RF+)		Right Front Midrange
30 Gray / Black	Right Front Speaker Negative (RF-)

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 if you are unfamiliar with this process.
3. Check volume, balance, fade and EQ settings.
4. If you would like to adjust the radio's beep volume or minimum volume, do so using one of the methods outlined below. If you are happy with the default levels, no adjustments are necessary.

Manually Setting the Radio's Beep Volume

You can manually set the level of the factory radio beeps using the programming button on the side of the interface. If you would like to set the beep volume using the PC app please proceed to the PC App section.

Setting the radio's beep volume using the programming button

1. Start with the level control knob turned all the way down (counter-clockwise).
2. Press the programming button on the side of the interface.
3. LED 1 will turn green and beeps will begin continuously sounding.
4. Turn the level control knob clockwise until the desired beep volume level is reached.
5. You can now either press the programming button twice or wait ten seconds to exit the settings.

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.

PLEASE NOTE: Level control knob must be connected to the module in order to set the Minimum Volume.

Setting the minimum volume using the programming button

1. Start with the level control knob turned all the way down (counter-clockwise).
2. Set the amp gains to the desired level.
3. Set the volume on the factory radio to 1.
4. Press the programming button on the side of the interface twice.
5. LED 1 will turn amber and the chimes will begin sounding every five seconds.
6. Turn the level control knob clockwise until the desired minimum volume level is reached.
7. You can now either press the programming button once or wait ten seconds to exit the settings.

AmpPRO App

Use of the AmpPRO App allows you to do the following:

- Configure User Interface Options such as:

• Minimum Volume Level
• Chime (Radio Beeps) Volume Level
- Enable / Disable AP4 Chimes (Radio Beeps)
- Enable / Disable factory EQ
- Bass / Mid / Treble boost frequencies and Q factor

• Update Product Firmware
• Read Firmware / Hardware Versions
• You can download the AmpPRO app at : http://aampglobal.com/appdownloads

AmpPRO App (cont.)

PLEASE NOTE: These settings can be adjusted with the module installed in the vehicle, or on the bench. However, it is recommended to make the adjustments with the module installed, and the factory radio on, so that the changes can be heard.

Minimum Volume Level - This allows you to set the minimum volume level of the factory radio (factory radio volume level 1).

Chime Volume Level - This allows you to set the volume of the radio beeps that are heard through the AP4.

Chimes Enabled - This allows you to enable / disable AP4 radio beeps (ie: tone that is heard when pressing radio buttons). This is used when mixing factory and aftermarket speakers. It is also possible to turn the beeps off altogether using the radio's factory settings menu.

3 Band EQ Enabled - This allows you to enable / disable the 3 band factory EQ.

Bass / Mid / Treble Freq / Q Factor - This allows you to set the center frequency that will be adjusted when setting the 3 band factory EQ, as well as the Q Factor for each frequency. The Q Factor determines how many of the adjacent frequencies will be affected when adjusting the selected frequency. The lower the Q Factor, the more frequencies will be affected.

Available Frequencies and Q Factors
Bass Frequency	60HZ	500HZ 7.5KHZ
	80HZ Mid Frequency	1KHZ 10KHZ
		Treble Frequency
	100HZ	1.5KHZ 12.5KHZ
	120HZ	2.5KHZ 15KHZ
Bass Q Factor	0.50	0.75			0.75
	1.00 Mid Q Factor	1.00 Treble Q Factor
	1.50	1.25			1.25
	2.00	1.50

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:

• Radio Beeps volume level
- Enable / Disable Factory Beeps
• Minimum volume level
- Enable / Disable factory EQ
• Factory EQ frequency
• Factory EQ Q factor

Troubleshooting

1. No audio - Check to see if LED 1 is illuminated. If not, cycle the ignition off and back on.
2. 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.
3. Cannot hear beeps when pressing buttons on the radio - Go to the Beep On / Off setting in the radio's settings menu and make sure it is set to ON. If it is, set it to OFF and back to ON and test for beeps again. Next, set the beep volume using process outlined in Setup and Configuration, or using the AmpPRO application. If you still do not hear beeps, be sure that you are using the remote output from the AP4 to turn on your aftermarket amplifier.
4. Low volume setting on radio is too loud - Set minimum volume using process outlined in Setup and Configuration, or using the AmpPRO application.
5. Drastic volume difference between radio sources - The radio stores the volume of the radio source from the last time that source was used. Readjust the volume of the individual sources to the same output level.

LED Legend
LED 1	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