Radio Replacement and
Steering Wheel Control Interface
for Toyota / Lexus / Scion Vehicles
RP4.2-TY11
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Page 1
Rev: V4
Date:091118
Introduction and Features
Important Notes
The RP4.2-TY11 interface allows the replacement of a factory radio in select Toyota/Lexus/Scion vehicles and will retain
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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. These instructions only apply to R.3.1.1.43 or later revisions. The revision info can be found on a small white sticker on the
interface and packaging.
2. Connection of the OBD connector, with the White / Red and White / Black wires, is not always necessary. Use of these wires
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outputs at the radio. See the “Installation Steps” section starting on page 3 for additional information.
3. 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.
4. The RP4.2-TY11 does not retain Rear Seat Entertainment.
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7. 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.
8. Aftermarket radio features such as High Pass Filters (crossovers), DSP or “Network Mode” will interfere with proper fader
function. In order for the RP4.2-TY11’s fader function to work, the audio from the aftermarket radio’s output must match so it can
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9. The USB-TY1 or USB-TY2 must be purchased in order to retain the factory USB port. Please refer to www.pac-audio.com to see
which harness you will need.
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
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Programming Button
USB Port
Radio Select DIP switches
Interface Connector 4
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