Radio Replacement and
Steering Wheel Control Interface
for Toyota / Lexus / Scion Vehicles
RP4.2-TY11
Introduction & Features
Important Notes
The RP4.2-TY11 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) 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.
These instructions only apply to R1.1.1.35 or earlier revisions. The revision info can be found on a small white sticker on the
interface and packaging.
2.
Connection of 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.
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.
5.
After installation, if you do not initially hear any audio, you may need to cycle the ignition again to initialize the factory amplifier.
6.
Speaker fading on factory amplified systems is only supported with the “amplified output” connection of the RP4.2-TY11.
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
compare the front and rear audio levels and determine the proper fader setting for the factory amplifier.
9.
The USB-TY1 or USB-TY2 must be purchased in order to retain the factory USB port.
10.
The CAM-TY11 or CAM-TY12 must be purchased in order to retain the factory reverse camera.
If the required harness is not
available, it is possible to hardwire the reverse camera
using the information provided in Appendix A on Page 9.
Module Layout
Module Status LED
Programmable Output / 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
