PAC AP4-TY12, Manual, Page: 2 / 15

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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 oscilliscope 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 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.
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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.
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Installation
1. Remove factory radio.
2. Disconnect the 28-pin harness, the 10-pin harness and the 6-pin harness from the radio.
3. Connect AmpPRO harnesses to vehicle harnesses.
4. Connect AmpPRO harnesses to factory radio.
5. 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 5 for more details.
c. DIP switches 3 and 4 are not used and should remain off (up).
6. If you are using the APA-TOS1 (sold separately) refer to the instructions included with that product for its installation.
7. Connect the AmpPRO harness to the module.
8. Connect the level control knob to the module and install in an accessible location.
9.
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10. Initially, if the beep through the AP4-TY12 does not match the on / off selection through the radio, cycle the beep to the
opposite setting and back, then test again.
11. The Yellow / Black "Mute Input from Telematics" wire will be used in conjunction with the Safety Connect / Lexus Enform
(SOS) Retention. See the Tech Brief "AP4-TY12 SOS Retention" at PAC-audio.com for detailed instructions.
12. The Brown "Mute Input From Navigation" is a spare mute lead that can be used for custom applications. The audio will be
muted whenever the Brown wire is supplied a ground.
DIP
1 2 3 4
ON
Two Channel Mode 5v / 4v Preout Not Used Not Used
1 2 3 4
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Module Layout
LED 1
Interface Connector 1
Expansion Port
TOSLINK Output
(APA-TOS1 sold separately)
Programming Button
Feature Select
DIP switches
Front Output
Ch. 1(L) and 2(R)
Non-Fading Level Control
Knob Connection
USB Connection
Rear Output
Ch. 3(L) and 4(R)
Non-Fading Output
Ch. 5(L) and 6(R)
LED 2