Radio Replacement and
Steering Wheel Control Interface
for Toyota / Lexus / Scion Vehicles
TY1A-RS
© 2019 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Page 1
Rev: V4
Date:090519
Introduction and Features
Important Notes
The TY1A-RS interface allows the replacement of a factory radio in select Toyota/Lexus/Scion vehicles and will retain
factory features such as steering wheel controls (SWC), USB ports (in most cases), AM / FM antenna, and the factory
audio amplifier. This interface also allows you to program two radio functions to each SWC button by using short press
long press dual command functionality, and also provides outputs such as: vehicle speed signal (VSS), illumination,
reverse trigger and parking brake.
1. Connection of the OBD connector, with the White / Red and White / Black wires, is not always necessary. Use of these wires
will be dependent on whether or not the aftermarket radio requires specific connections, and whether the vehicle provides these
outputs at the radio. See the “Installation Steps” section starting on page 3 for additional information.
2.
Adjustment of the vehicle settings through the original radio’s vehicle settings menu will be disabled after installation of the new
radio. It is advised to make sure all settings are as you desire prior to removal of the original radio.
3. The TY1A-RS does not retain Rear Seat Entertainment.
4.
After installation, if you do not initially hear any audio, you may need to cycle the ignition again to initialize the factory amplifier.
5.
Speaker fading on factory amplified systems is only supported with the “amplified output” connection of the TY1A-RS.
6. When using real time fade, if the fader setting is biased more to the front or rear, as the radio turns on the sound may begin at
the default setting and then quickly transition to your custom setting.
7.
Aftermarket radio features such as High Pass Filters (crossovers), DSP or “Network Mode” will interfere with proper fader
function. In order for the TY1A-RS’s fader function to work, the audio from the aftermarket radio’s output must match so it can
compare the front and rear audio levels and determine the proper fader setting for the factory amplifier.
8.
The USB-TY1 and USB-TY2 are included in order to retain the factory USB port for most (but not all) applications. Please refer
to www.pac-audio.com to see which harness you will need.
9.
Best Kit’s part number BAA44 is included for vehicles that require an antenna adapter.
10.
The CAM-TY11 or CAM-TY12 must be purchased in order to retain the factory reverse camera. Please refer to
www.pac-
audio.com to see which harness you will need. If the required harness is not available, it is possible to hardwire the
reverse camera using the information provided in Appendix A on Page 7.
Module Layout
Module Status LED
USB Status LED
Interface Connector 1
Expansion Port
Interface Connector 2
Amplified Audio Output
Non-Amplified Audio Output
Programming Button
USB Port
Radio Select DIP switches
Interface Connector 4
Amplified Audio Output Level Adjustment
