Aerpro CHTO20C Steering Wheel Control Interface

Product Overview

The Aerpro CHTO20C is a CAN Bus steering wheel control interface designed for select Toyota vehicles. It facilitates the retention of factory steering wheel controls and provides access to the Toyota 360 Panoramic Camera functions when installing an aftermarket head unit.

Compatibility: Toyota RAV4 (2019-2020)

This interface is suitable for amplified vehicles but does not support fade functionality. It is compatible with both left-hand drive (LHD) and right-hand drive (RHD) vehicles. The images provided are representative of LHD vehicles.

Key Features

• Retains Factory Steering Wheel Control Functionality
• Retains Factory Phone Button Functionality
• Retains Amplified System
• Retains 360 Panoramic Camera
• Provides Outputs for Park Brake, Speed Pulse & Reverse Gear
• Software Updatable (contact supplier for more information)

Product Information

The CHTO20C interface integrates seamlessly with your vehicle's CAN Bus system. It ensures that essential steering wheel controls, such as volume, track selection, and phone functions, remain operational after installing a new head unit. It also enables control and display of the vehicle's 360° panoramic camera system.

Important Note on Camera Language: The 360° camera language must be set to the appropriate format within the vehicle's original system before modification. If not set beforehand, the interface and the new head unit will default to English.

Wiring Key

In ISO Connector

Additional Connections

Power & Illumination (ISO Connector)

Steering Wheel Control Functionality

The following details the mapping of original steering wheel controls to new functions. Note that individual vehicle configurations may vary.

Original Functions

• 1. Volume Up
• 2. Volume Down
• 3. Arrow Left
• 4. Arrow Right
• 5. Track Up & Down
• 6. Speech
• 7. Back
• 8. Pick Up
• 9. Mode
• 10. 360 View

New Functions (Example Mapping)

• 1. Volume Up (Toggle Lower Left Menu Preset)
• 2. Volume Down (Toggle Upper Left Menu Preset)
• 3. Arrow (Toggle Middle Menu Preset)
• 4. Arrow (Toggle Lower Right Menu Preset)
• 5. Track Up & Down
• 6. Speech
• 7. Back
• 8. Pick Up (Toggle Upper Right Menu Preset)
• 9. Enter & Exit 360 Panoramic State (Re-assign Buttons by holding Mode for ~8 seconds)
• 10. Toggle 360 View

* Functionality for re-assigned buttons (9) is active when the camera view is displayed. Menu functionality depends on the original vehicle specifications.

Installation Guide

Prior to Installation:

Technical knowledge is required for installation. Ensure the installation area is free from moisture and heat. Use appropriate tools to prevent damage to the vehicle or product. Aerpro is not liable for installation-related damages.

Installation Steps:

1. Remove and disconnect the factory stereo. Consult the vehicle owner's manual or a professional if needed.
2. A stereo connection (patch) lead is required (sold separately). Ensure you have the correct lead. For universal leads, prepare wiring loops as per the supplied manual.
3. Connect the 12-pin connector from the stereo connection (patch) lead to the interface box.
4. Connect the opposite end of the stereo connection (patch) lead to the steering wheel control input on the back of the aftermarket stereo. This may be a 3.5mm jack or a wired input; consult the aftermarket stereo manual.
5. ❗ IMPORTANT: This step must be completed before connecting power to the interface to avoid loss of functionality and potential reinstallation.
6. Connect the 20-pin connector from the supplied wiring loom to the interface box.
7. Connect the power/speaker ISO connector to the corresponding connector at the rear of the aftermarket stereo. If the aftermarket stereo lacks an ISO connector, refer to the "Wiring Key" on page 2 for manual wire connections. Some interfaces may have additional flying wires for features like parking brake, reverse gear, and speed pulse.
8. Connect any additional wiring, AUX connectors, and the Yellow RCA connector to the aftermarket stereo's wiring harness as required.
9. Connect the vehicle-specific power connectors on the supplied harness to the vehicle's OEM connectors.
10. Test the stereo and steering wheel control functionality before reassembling the dashboard. If controls are unresponsive, uninstall and reinstall carefully following the steps above.

360 Camera Functionality

Accessing the 360 Camera:

• In Park: A short press of the 360 View Button (10) displays the 'dynamic 360 view'. Use button presets to change viewing angles. Another short press exits to the main menu.
• In Reverse: Upon engaging reverse gear, the 'rear view & panoramic view' appears. A short press of the 360 View Button (10) switches to 'rear view'. Disengaging reverse exits camera mode.
• In Drive: Shifting from Reverse to Drive displays the 'front & panoramic view'. A short press of the 360 View Button (10) switches to 'front left / front right view'. A subsequent short press exits to the main menu.

Camera functionality relies on re-assigned buttons, achievable by holding the 'Mode' button (9) for approximately 8 seconds. Menu system layouts may differ between LHD and RHD vehicles.

'AUTO' Functionality:

In addition to manual screen switching via the camera switch (10), automatic display mode is available. The screen switches automatically based on vehicle speed: 1) When the shift lever is in "N" or "D". 2) When vehicle speed drops to approximately 10 mph (18 km/h). The camera mode will automatically close after 15-20 seconds of inactivity.

Language Settings:

Language is controlled by the original vehicle system. If a specific language is required, it must be set in the vehicle's system before installing the new head unit, as the interface does not support language setting. The interface defaults to English if no language is pre-set.

Wiring Diagram Description

The wiring diagram illustrates the connections between the vehicle, the CHTO20C interface box, and the aftermarket stereo.

• Vehicle Connections: Three OEM specific connectors from the vehicle connect to corresponding ports on the interface.
• Flying Wires: These wires (Pink for Speed Pulse, Green for Park Brake, Purple for Reverse Gear) connect to the aftermarket stereo's relevant inputs.
• Main Wiring Loom: A 20-pin connector from the main loom connects to the interface box.
• Stereo Connection (Patch) Lead: A 12-pin connector from the patch lead connects to the interface box. This lead must be connected first before any power is supplied to the interface. The other end of the patch lead connects to the aftermarket stereo's steering wheel control input.
• ISO Connector: Connects to the aftermarket stereo's ISO connector for power and speaker outputs.
• AUX Connections: Red/White RCA connectors for AUX audio connect to the aftermarket stereo.
• Camera Connection: A Male Yellow RCA connector connects to the aftermarket stereo's camera input.