RadioPRO 4 RP4.2-TY11 Radio Replacement & Steering Wheel Control Interface

Introduction & Features

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.

Important Notes

1. Connection of the White/Red and White/Black wires is not necessary when installing a single DIN head unit. See note # 6 in "Installation Steps" on the next page for a full description of the functionality of these wires.
2. Adjustment of the vehicle settings through the original radio's vehicle settings menu will be disabled after installation of your new radio. It is advised to make sure all settings are as you desire prior to removal of the original radio.
3. Does not retain Rear Seat Entertainment.
4. Speaker fading on factory amplified systems is only supported by the amplified output.
5. When using real time fade, if you have the fader set more to the front or back, upon start up the sound may begin at the default setting and then quickly transition to your custom setting. Other head unit features such as High Pass Filters, DSP and Network Mode may cause inconsistent fader operation.
6. 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.
7. 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 you do not have the harness required and need to retain the reverse camera, please refer to Appendix A on Page 8 for hard wiring options.

Wiring Connection Chart

Vehicle Connector

• *Violet/White: Analog Reverse Signal
• *Green: Analog Parking Brake Signal
• *Pink: Analog Vehicle Speed Signal

Module Layout

The interface module features several key components:

• Radio Connector: Connects to the aftermarket radio.
• Amplified audio output gain adjustment: A dial to set audio gain for amplified systems.
• Radio Select Dipswitches: Switches to configure the interface for specific radio brands.
• Programming Button: Used for SWC programming and resetting the module.
• USB Port: For firmware updates and app connectivity.
• Module Status LED: Indicates the operational status of the module.
• Interface Connector 1: Primary connection to the vehicle harness.
• Expansion Port: For optional accessories.
• Interface Connector 2: Secondary connection to the vehicle harness.
• Non-Amplified Audio Output: For vehicles without a factory amplifier.
• Amplified Audio Output: For vehicles with a factory amplifier.
• Programmable Output/USB Status LED: Indicates status for programmable outputs or USB connection.

Installation Steps

Setting Radio Dipswitches

Before connecting the interface to the vehicle, the radio select dipswitches on the side of the module must be adjusted to the proper radio setting. The table below shows the correct dipswitch positions for various radio brands:

Figure 1 illustrates the dipswitch panel.

General Connections

1. Adjust the radio select dipswitches to the correct setting for your aftermarket radio before plugging the interface into the vehicle.
2. Make all connections as described in the wiring chart on page 1. Refer to page 6 for a full description of the red/white wire's functions.
3. Ensure all speakers are connected with proper polarity to avoid inconsistent fading behavior.
4. For non-amplified vehicles: Connect the 12-pin plug of the vehicle harness into the non-amplified output on the interface.
5. For amplified vehicles: Plug the 12-pin plug of the vehicle harness into the amplified output on the interface.

Navigation Outputs

There are three methods to obtain navigation outputs from the interface:

1. Analog Signals: Check the factory side of the 28-pin harness (opposite green, purple, and pink wires) for populated wires. If present, use the navigation wires from the Vehicle Connector in the PAC harness.
2. CAN Data: Check the factory side of the 28-pin harness (opposite white/red and white/black twisted pair wires) for populated wires. If present, use the navigation wires from the Radio Connector in the PAC harness.
3. OBDII Connector: If analog or CAN data is not available, connect the long White/Red HS-CAN+ wire to pin 6 and the long White/Black HS-CAN- wire to pin 14 in the OBDII connector (refer to Figure 1 for pin locations). Then, use the navigation wires from the Radio Connector in the PAC harness.

Figure 1 shows the OBDII connector with pins 6 and 14 highlighted.

7. Connect the SWC wire according to the chart on page 1. The aftermarket radio must support a wired remote input.

Steering Wheel Controls (SWC)

Default SWC Programming

The interface comes pre-programmed for all factory SWC functions. Programming is only required to re-assign functions, use short press/long press dual commands, or assign the programmable 12v output to an SWC button. To restore default settings, press and release the programming button once and wait 7 seconds for the LED to flash 3 times.

Default SWC Button Assignments

The table below shows the default assignments for various radio brands:

Optional Steering Wheel Control Programming

To re-assign SWC functions, use short press/long press dual commands, or assign the programmable 12v output to an SWC button, follow the programming order on page 4. If a function is not available on your steering wheel or not desired, press and release the programming button to skip it. The LED will flash to confirm the skip.

Short Press Long Press Dual Command Functionality

This feature allows assigning two aftermarket radio functions to each SWC button. A quick press initiates the short press command; holding the button for over two seconds initiates the long press command. Long press commands are not programmed by default.

Programmable 12v Output

The red/white wire can be programmed via the RadioPRO app for a pulsed or latched 12v output, assignable to any factory SWC button. This output can control external accessories. Refer to page 6 for more details.

Optional SWC Programming Procedure

Follow these steps to program or re-program steering wheel controls:

1. Turn the key to the ignition position.
2. Press and release the programming button on the interface. The Status LED will turn green.
3. Within 7 seconds, press and hold the steering wheel button to be learned. The LED turns red when pressed.
• A. Short Press: Release the button within 1.5 seconds. The LED returns to solid green.
• B. Long Press: Hold the button until the LED starts blinking. Release the button; the LED returns to solid green.
4. To program more buttons, repeat step 3 for each additional function.
5. To skip a function not present on your steering wheel or not desired, press and release the programming button.
6. After programming, wait seven seconds. The LED will flash three times to indicate completion.
7. Test the interface. The LED should blink when any SWC is pressed. If a function fails, repeat the programming steps.

Re-Calibration Programming Order

If SWC buttons need re-calibration, follow this order. Note that buttons must be calibrated in this specific sequence:

After re-calibration, default SWC assignments are the same as listed on page 3. For re-assignment, use the programming process on page 4.

Testing & Verification

1. Turn the ignition on. The interface LED and the +12v accessory wire should activate.
2. Turn on the radio and check volume, balance, and fade. If no audio is heard, cycle the ignition to initialize the factory amplifier.
3. If overall volume is too low, adjust the gain on the RP4.2 interface. Set the radio volume to 3/4, then increase the RP4.2 gain until slight distortion is heard, then reduce it slightly.
4. For JBL systems with no audio, ensure the blue/white remote wire is connected properly. If audio is still absent, reset the interface.
5. If fading is inconsistent, verify correct speaker polarity.
6. Verify all SWC are functioning properly. If not, reset the interface or follow the re-calibration procedure.
7. Verify the programmable 12v+ output is functioning as intended.
8. The LED and radio will turn off when the ignition is turned off.

Restoring Factory Settings

To restore factory defaults, press and hold the programming button until the status LED blinks red. Release the button while it is blinking red. The LED sequence is green blink, amber blink, then red blink.

This reset restores the following settings:

• SWC Mapping
• Programmable 12v+ Output (Latched)
• Parking Brake Output Settings
• Factory Amplifier Settings
• Real Time Fade (resets to 'on')

RadioPRO App

The RadioPRO App allows for advanced configuration and updates:

• Configure User Interface Options:
  • Programmable 12v Output behavior
  • Aftermarket radio Parking Brake Sequencing
  • Factory amplifier settings (Bass, Mid, Treble, Gain, Fader & Balance)
  • Real Time Fading
• Firmware Updates: Update the interface with the latest firmware.
• Read Firmware/Hardware Versions: Check current software and hardware versions.
• Access Product User Manuals: View digital copies of the manual.

Note: The interface must be connected to the vehicle for Programmable 12v Output Behavior and Factory Amplifier Settings. Firmware updates and version checks can be done without vehicle connection.

Programmable 12v Output Wire

The red/white wire can be programmed for pulsed or latched 12v output, triggered by a user-assigned SWC button or vehicle events (foot brake, door, trunk). Available triggers depend on the vehicle's data bus.

• Trunk: 12v+ output when ignition is on and trunk is opened.
• Alpine: Works with parking brake output for menu access sequencing. Requires actual parking brake engagement. Alternatively, select "Foot Brake" for manual sequencing.
• Door: 12v+ output when any door is opened (if signal is available).
• Footbrake: 12v+ output when the foot brake is pressed (if signal is available).
• Latched: A latched 12v+ output activated by an assigned SWC. Remains on until the SWC is pressed again or ignition is turned off.

Pioneer Parking Brake

When enabled, this feature uses the parking brake output for necessary sequencing for settings menu access. This relies on the actual parking brake engagement. If disabled, manual parking brake sequencing is required.

Infotainment/Factory Amplifier Settings

Adjust factory amplifier settings including Amp Gain, Fader, Balance, Bass, Mid & Treble, and real-time fade. With real-time fade enabled, fading is controlled directly from the aftermarket radio. Restoring factory settings defaults all values to the middle position.

Firmware Updates

To update firmware: Set all dipswitches to the down position. Connect the interface to a PC. In the RadioPRO app, select "Update Firmware", then "Select File", and browse to the firmware file. After the update, disconnect from PC and set dipswitches according to the installed radio.

Appendix A: Reverse Camera Retention

If the CAM-TY11 or CAM-TY12 harness is not available, the factory reverse camera can be retained using the following schematics. Older vehicles (pre-2014) use a 16-pin harness (Fig. 1), while newer vehicles (2014+) use a 24-pin harness (Fig. 2). Some years may overlap.

The necessary 6v+ for the factory camera can be obtained from pin 12 of the RP4.2 Interface Connector 2 (Fig. 3).

Figure 1: 16-Pin Harness (Older Vehicles)

Figure 2: 24-Pin Harness (Newer Vehicles)

Figure 3: RP4.2 Interface Connector 2 Pinout for Camera Power