Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: System Description

SYSTEM DESCRIPTION

NAVIGATION SYSTEM OUTLINE

(a) Vehicle position tracking methods

It is essential that the navigation system correctly tracks the current vehicle position and displays it on the map. There are 2 methods to track the current vehicle position: autonomous (dead reckoning) and GPS* (satellite) navigation. Both navigation methods are used in conjunction with each other.

*: GPS (Global Positioning System)

Operation	Description
Vehicle Position Calculation	The navigation ECU calculates the current vehicle position (direction and current position) using the direction deviation signal from the gyro sensor and driving distance signal from the vehicle speed sensor and creates the driving route.
Map Display Processing	The navigation ECU processes the vehicle position data, vehicle driving track and map data from the internal memory.
Map Matching	The map data from the internal memory is compared to the vehicle position and driving track data. Then, the vehicle position is matched with the nearest road.
GPS Correction	The vehicle position is matched to the position measured by the GPS. Then, the GPS measurement position data is compared with the vehicle position and driving track data. If the position is very different, the GPS measurement position is used.
Distance Correction	The vehicle speed signal includes the error caused by tire wear and slippage between the tires and road surface. Distance correction is performed to account for this. The radio receiver assembly automatically offsets the signal to make up for the difference between it and the distance data of the map. The offset is automatically updated.

HINT:

The combination of autonomous and GPS navigation makes it possible to display the vehicle position even when the vehicle is in places where GPS signals cannot be received. When only autonomous navigation is used, however, the mapping accuracy may slightly decrease.

(b) Autonomous navigation

This method determines the relative vehicle position based on the driving track determined by the gyro sensor located in the navigation ECU and the vehicle speed signal.

(1) Gyro sensor

Used to calculate the direction by detecting angular velocity. It is located in the navigation ECU.

(2) Vehicle speed signal

Used to calculate the vehicle driving distance.

(c) GPS* navigation (Satellite navigation)

This method detects the absolute vehicle position using radio waves from GPS satellites.

*: GPS satellites were launched by the U.S. Department of Defense for military purposes.

Number of Satellites	Measurement	Description
2 or less	Measurement is impossible	Vehicle position cannot be obtained because the number of satellites is not enough.
3	2-dimensional measurement is possible	Vehicle position is obtained based on the current longitude and latitude. (This is less precise than 3-dimensional measurement.)
4	3-dimensional measurement is possible	Vehicle position is obtained based on the current longitude, latitude and altitude.

(d) Map matching

The current driving route is calculated by autonomous navigation (according to the gyro sensor and vehicle speed signal) and GPS navigation. This information is then compared with possible road shapes from the map data in the internal memory and the vehicle position is set onto the most appropriate road.

DYNAMIC VOICE RECOGNITION FUNCTION OUTLINE (w/ Dynamic Voice Recognition Function)

(a) There are two types of voice recognition; the voice recognition function uses voice recognition data stored in the onboard device. The other is communication based and uses voice recognition data sent from communication with the DCM (telematics transceiver) as audio signals to be stored at the center.

HINT:

Refer to the Lexus Enform system for information about communication based voice recognition.

Click here

DISC PLAYER OUTLINE

(a) A disc player uses a laser pickup to read digital signals recorded on a disc. By converting the digital signals to analog, it can play music, video and audio.

CAUTION:

Do not look directly at the laser pickup because the disc player uses an invisible laser beam. Be sure to operate the player only as instructed.

(b) This player can play only audio CDs, CD-Rs (CD-Recordable) and CD-RWs (CD-ReWritable) that have any of the following marks:

(c) This player can play only DVD video discs that have any of the following marks:

(d) This player can play only DVD-Rs (DVD-Recordable) and DVD-RWs (DVD-ReWritable) that were recorded in video format and that have any of the following marks:

(e) The following products may not be playable on your player.

(f) Precautions for use of discs

(g) Cleaning

NOTICE:

Do not use a lens cleaner because it may cause a malfunction in the pickup portion of the player.

(1) If dirt is on the disc surface, wipe it clean with a soft dry cloth, such as an eyeglass cleaner for plastic lenses, from the inside to the outside in a radial direction.

USB AUDIO SYSTEM FUNCTION OUTLINE

(a) The No. 1 stereo jack adapter assembly is equipped with a USB connector. Connecting a USB device or "iPod" to the No. 1 stereo jack adapter assembly allows music files to be played. Not only is it possible to play music from a USB device with audio functions, it is also possible to play MP3, WMA, AAC, WAV (LPCM), FLAC, ALAC or OGG Vorbis music files that are stored on a USB device. In addition, "iPod" control software is installed, allowing file selection from playlists and operation using shuffle mode.

HINT:

Operation through the controls of a USB device or "iPod" cannot be performed while it is connected.

(b) USB audio system compatible devices

(1) USB device

The following device formats can be used:

Compatible USB device formats

USB communication format: USB 2.0 HS (480 Mbps) File format: FAT16/32 (Windows) Class: Mass storage class

MP3, WMA, AAC, WAV (LPCM), FLAC, ALAC and OGG Vorbis files written to a USB device with any format other than those listed above may not be played correctly, and their names and folder names may not be displayed correctly.

Items related to standards and limitations are as follows:

(2) "iPod"

"iPhone", "iPod", "iPod classic", "iPod nano" and "iPod touch" are trademarks of Apple Inc., registered in the U.S. and other countries.

The following "iPod", "iPod nano", "iPod classic", "iPod touch" and "iPhone" devices can be used with this system.

Made for:

USB VIDEO SYSTEM FUNCTION OUTLINE

(a) Playable video file standards

File format	MPEG-4, AVI Container, Windows Media Video
Corresponding screen size	MAX 1920 x 1080
Corresponding frame rate	MAX 60i/30p

HIGH-RESOLUTION SOUND SOURCE OUTLINE

(a) This device supports high-resolution sound sources.

(b) The definition of high-resolution is based on the standards of groups such as the CTA (Consumer Technology Association).

(c) The following formats and media can be used:

Supported formats	WAV (LPCM), FLAC, ALAC, OGG Vorbis
Playable media	USB

FILE INFORMATION OUTLINE

(a) Playable MP3 file standards

Compatible standard	MPEG1 LAYER3, MPEG2 LSF LAYER3
Compatible sampling frequency	MPEG1 LAYER3: 32, 44.1, 48 (kHz) MPEG2 LSF LAYER3: 16, 22.05, 24 (kHz)
Compatible bit rate	MPEG1 LAYER3: 32 to 320 (kbps) MPEG2 LSF LAYER3: 8 to 160 (kbps) Compatible with VBR
Compatible channel mode	Stereo, joint stereo, dual channel, monaural

(b) Playable WMA file standards

Compatible standard	WMA Ver. 7, 8, and 9
Compatible sampling frequency	32, 44.1, 48 (kHz)
Compatible bit rate (Only compatible with 2-channel playback)	Ver. 7, 8: CBR48 to 192 (kbps) Ver. 9: CBR48 to 320 (kbps) Compatible with VBR

(c) Playable AAC file standards

Compatible standard	MPEG4/AAC-LC
Compatible sampling frequency	11.025, 12, 16, 22.05, 24, 32, 44.1, 48 (kHz)
Compatible bit rate	8 to 320 (kbps) Compatible with VBR

(d) Playable WAV (LPCM) file standards*

*: Files with a sample rate higher than 48kHz are down-converted to 48kHz/24bit.
Compatible sampling frequency	8/11.025/12/16/22.05/24/32/44.1/48/88.2/96/176.4/192 (kHz)
Compatible bit rate	16/24 (bit)

(e) Playable FLAC file standards*

*: Files with a sample rate higher than 48kHz are down-converted to 48kHz/24bit.
Compatible sampling frequency	8/11.025/12/16/22.05/24/32/44.1/48/88.2/96/176.4/192 (kHz)
Compatible bit rate	16/24 (bit)

(f) Playable ALAC file standards*

*: Files with a sample rate higher than 48kHz are down-converted to 48kHz/24bit.
Compatible sampling frequency	8/11.025/12/16/22.05/24/32/44.1/48/64/88.2/96 (kHz)
Compatible bit rate	16/24 (bit)

(g) Playable OGG Vorbis file standards*

*: Files with a sample rate higher than 48kHz are down-converted to 48kHz/24bit.
Compatible sampling frequency	8/11.025/16/22.05/32/44.1/48 (kHz)
Compatible bit rate	32-500 (kbps) Compatible with VBR

(h) ID3 tag, WMA tag, AAC tag, TAG and Vorbis comment

(1) Additional text information called an ID3 tag can be input to MP3 files. Information such as song titles and artist names can be stored.

HINT:

This player is compatible with ID3 tags of ID3 Ver. 1.0 and 1.1, and ID3 Ver. 2.2 and 2.3. (Number of characters complies with ID3 Ver. 1.0 and 1.1, and ID3 Ver. 2.2 and 2.3.)

(2) Additional text information called a WMA tag can be input to WMA files. Information such as song titles and artist names can be stored.

(3) Additional text information called an AAC tag can be input to AAC files. Information such as song titles and artist names can be stored.

(4) Additional text information called a TAG can be input to WAV (LPCM), FLAC, ALAC files. Information such as song titles and artist names can be stored.

(5) Additional text information called a Vorbis comment can be input to OGG Vorbis files. Information such as song titles and artist names can be stored.

(i) Usable media

(1) Only CD-ROMs, CD-Rs (CD-Recordable), CD-RWs (CD-ReWritable), DVD-ROMs, DVD-Rs (DVD Recordable), DVD-RWs (DVD-ReWritable) and USB devices can be used to play MP3/WMA/AAC files.

(2) Only USB devices can be used to play WAV (LPCM)/FLAC/ALAC/OGG Vorbis files.

(j) Usable media format

(1) Usable media format

Disc format	CD-ROM Mode 1, CD-ROM XA Mode 2 Form 1, DVD ROM
File format	ISO9660 Level 1 and Level 2 (Joliet, Romeo) UDF2.01 (Universal Disk Format)

(2) Standards and restrictions

Maximum directory levels	8 levels
Maximum number of characters for a folder name/file name	32 characters
Maximum number of folders	192 (Including empty folders, root folders, and folders that do not contain MP3/WMA/AAC files)
Maximum number of files in a disc	255 (Including non-MP3/WMA/AAC files)

(k) File names

(1) Only files with an extension of ".mp3", ".wma", ".m4a", ".wav", ".flac", ".alac", ".ogg" and ".oga" can be recognized and played as MP3, WMA, AAC, WAV (LPCM), FLAC, ALAC or OGG Vorbis files.

(2) Save MP3, WMA, AAC, WAV (LPCM), FLAC, ALAC or OGG Vorbis files with an extension of ".mp3", ".wma", ".m4a", ".wav", ".flac", ".alac", ".ogg" or ".oga".

NOTICE:

If non-MP3, non-WMA, non-AAC, non-WAV (LPCM), non-FLAC, non-ALAC or non-OGG Vorbis files are saved with an extension of ".mp3", ".wma", ".m4a", ".wav", ".flac", ".alac", ".ogg" or ".oga", those files may be wrongly recognized as MP3, WMA, AAC, WAV (LPCM), FLAC, ALAC or OGG Vorbis files and played. A loud noise may occur and damage to the speakers may result.

"Bluetooth" OUTLINE

*1	Radio Receiver Assembly (Built-in "Bluetooth" Antenna)	-	-
*a	Example	*b	Cellular Network
*c	Cellular Phone ("Bluetooth" Compatible Type)	*d	Portable Audio Player ("Bluetooth" Compatible Type)
*e	"Bluetooth" Wireless Connection	-	-

(a) "Bluetooth" is a trademark owned by Bluetooth SIG, Inc.

(b) "Bluetooth" is a wireless connection technology that uses the 2.4 GHz frequency band.

HINT:

The communication performance of "Bluetooth" may vary depending on obstructions or radio wave conditions between communication devices, electromagnetic radiation, communication device sensitivity or antenna capacity.

(c) Hands-free function

(1) The "Bluetooth" built-in radio receiver assembly and a "Bluetooth" compatible cellular phone* can be connected using a "Bluetooth" wireless connection. This enables the use of the hands-free function on the cellular phone even if the phone is in a pocket or bag. For this reason, it is not necessary to use a connector or cable to connect the cellular phone.

*: Some versions of "Bluetooth" compatible cellular phones may not function properly.

(2) The hands-free function uses a "Bluetooth" wireless connection. A "Bluetooth" wireless connection can be affected by uncertain elements, such as vehicle location, time of day, etc. Therefore, problems related to establishing connection may be caused temporarily by "Bluetooth" connection conditions. It is necessary to check the frequency of occurrence, connection conditions using another cellular phone, etc. when performing diagnosis.

(3) Compatible hands-free devices

Required "Bluetooth" specifications	Ver. 2.0 or higher (Ver. 4.2 recommended)
Compatible profiles	HFP (Hands-Free Profile) Ver. 1.0 or higher (Ver. 1.7 or higher recommended)*1 OPP (Object Push Profile) Ver. 1.0 or higher (Ver. 1.2 or higher recommended)*2 PBAP (Phone Book Access Profile) Ver. 1.0 or higher (Ver. 1.2 or higher recommended)*2 MAP (Message Access Profile) Ver. 1.0 or higher (Ver. 1.2 or higher recommended)*4 SPP (Serial Port Profile) Ver. 1.2 or higher*3
Maximum number of hands-free devices that can be registered (including audio devices)	5

HINT:

The amount of remaining battery charge displayed on the radio receiver assembly may be different from that of the "Bluetooth" device.

(d) "Bluetooth" audio function

(1) The "Bluetooth" built-in radio receiver assembly and a "Bluetooth" compatible portable audio player* can be connected using a "Bluetooth" wireless connection. This enables files stored in the portable audio player to be heard from the vehicle speakers. In addition, operations such as play/stop can be performed directly from the radio receiver assembly.

*: Some versions of "Bluetooth" compatible audio players may not be able to be connected via the "Bluetooth" function, or music may play, but functions available using the radio receiver assembly may be limited.

(2) Compatible "Bluetooth" audio devices

Required "Bluetooth" specifications	Ver. 2.0 or higher (Ver. 4.2 recommended)
Compatible profiles	A2DP (Advanced Audio Distribution Profile) Ver. 1.0 or higher (Ver. 1.3 or higher recommended) AVRCP (Audio/Video Remote Control Profile) Ver. 1.0 or higher (Ver. 1.6 or higher recommended)
Maximum number of audio devices that can be registered (including hands-free devices)	5

RADIO DESCRIPTION

(a) Radio frequency band

(1) Radio broadcasts use the radio frequency bands shown in the table below.

(b) Service area

(1) The service areas of AM and FM broadcasts are vastly different. Sometimes an AM broadcast can be received very clearly but an FM stereo broadcast cannot. FM stereo has the smallest service area, and is prone to pick up static and other types of interference such as noise.

*a	FM (Stereo)
*b	FM (Monaural)
*c	AM

(c) Radio reception problems

HINT:

In addition to static, other problems such as "phasing", "multipath" and "fade out" exist. These problems are not caused by electrical noise, but by the radio signal propagation method itself.

(1) Phasing

AM broadcasts are susceptible to electrical interference and another kind of interference called phasing. Occurring only at night, phasing is the interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off the ionosphere and the other signal is received directly from the transmitter.

*a	Phasing
*b	Ionosphere

(2) Multipath

Multipath is a type of interference created when a vehicle receives 2 radio wave signals from the same transmitter. One signal is reflected off buildings or mountains and the other signal is received directly from the transmitter.

*a

Multipath

(3) Fade out

Fade out is caused by objects (buildings, mountains and other large obstructions) that deflect part of a signal, resulting in a weaker signal when the object is between the transmitter and vehicle. High frequency radio waves, such as FM broadcasts, are easily deflected by obstructions. Low frequency radio waves, such as AM broadcasts, are less likely to be deflected.

*a

Fade Out

(d) Noise problem

Technicians must have a clear understanding about each customer's noise complaint. Use the following table to diagnose noise problems.

Radio Frequency	Noise Occurrence Condition	Presumable Cause
AM	Noise occurs in a specific area	Foreign noise
	Noise occurs when listening to an intermittent broadcast	An identical program transmitted from multiple towers can cause noise where the signals overlap
	Noise occurs only at night	Signal phasing
FM	Noise occurs while driving in a specific area	Multipath resulting from a change in FM frequency

"HD Radio" FUNCTION OUTLINE (w/ HD Radio Function)

(a) The "HD Radio" system is a radio system that broadcasts in the IBOC (In-Band On-Channel) form that the iBiquity Co. has developed. By expanding the bandwidth per channel of conventional FM/AM bands, digital audio and data signals are additionally transmitted.

"HD Radio" technology is manufactured under license from iBiquity Digital Corporation. U.S. and Foreign Patents. "HD Radio" and the HD and HD Radio logos are proprietary trademarks of iBiquity Digital Corporation. Also, traffic and weather information can be received and displayed on the navigation screen.

SiriusXM FUNCTION OUTLINE (w/ SXM Function)

(a) SiriusXM (SXM) satellite radio is a satellite digital radio broadcast provided by SiriusXM Radio Inc. The broadcast (pay-type) is performed through satellites and terrestrial repeater networks. Several unique channels are available, and even if a vehicle changes locations, the same information can be received without breaks. Information such as song names, broadcast station names, etc. can be received.

NOTICE:

To receive pay-type broadcasts, the customer must enter into a pay-type contract with SiriusXM Satellite Radio Inc. After entering into a contract, registration of the Radio ID is necessary. Also, if parts are replaced, the Radio ID must be re-registered.

HINT:

When disconnecting the cable from the negative (-) battery terminal, the broadcast station logo data will be initialized. It takes a while for the broadcast station logo data to be updated to the latest data.

VEHICLE CUSTOMIZATION OUTLINE

(a) Customization of functions can also be performed on the multi-display assembly screen. Refer to the Owner's Manual for further information on customizable items for the navigation system.

AUTOMATIC SOUND LEVELIZER (ASL) FUNCTION OUTLINE

(a) The Automatic Sound Levelizer (ASL) function automatically adjusts the audio system volume in order to compensate for increased vehicle noise (vehicle noise tends to increase as vehicle speed increases). The ASL adjusts the volume based upon vehicle speed signals sent from the combination meter assembly.

HINT:

To use the "Wi-Fi" hotspot function, initial setup of the LEXUS App Suite function is necessary.

"Wi-Fi" hotspot OUTLINE (w/ "Wi-Fi" hotspot Function)

(a) "Wi-Fi" is a worldwide wireless communication standard widely used as a short range communication tool.

(b) "Wi-Fi" is a trademark owned by Wi-Fi Alliance, a non-profit industry association.

(c) The radio receiver assembly uses the 2.4 GHz frequency band for "Wi-Fi" communication.

HINT:

The communication performance of "Wi-Fi" may vary depending on obstructions or radio wave conditions between communication devices, electromagnetic radiation, communication device sensitivity or antenna capacity.

eOwner's MANUAL FUNCTION OUTLINE

(a) The eOwner's Manual can be used by installing it to the radio receiver assembly.

HINT:

Re-install the eOwner's Manual when replacing the radio receiver assembly.

"Android Auto" FUNCTION OUTLINE (w/ "Android Auto" Function)

(a) The "Android Auto" function is a function that enables the head unit to operate applications on a smartphone by connecting the smartphone to the head unit using a dedicated cable.

"Apple CarPlay" FUNCTION OUTLINE (w/ "Apple CarPlay" Function)

(a) The "Apple CarPlay" function is a function that enables the head unit to operate applications on a smartphone by connecting the smartphone to the head unit using a dedicated cable.

TOUCH FUNCTION CANCELLATION FUNCTION OUTLINE

(a) Touch function cancellation function

(1) The touch function cancellation function disables touchpad operation of the remote touch, if it is not operated for 12 seconds or more.

Click here

COMMUNICATION SYSTEM

(a) MOST Network Outline

*a	Example	*b	MOST Communication Line
*c	Shielded	*d	Wake-up Signal
*e	Master Unit	*f	Slave Unit

(1) Components of the navigation system communicate with each other via the MOST network.

(2) The MOST network uses a shielded twisted pair of wires for its communication lines.

(3) The master unit of the MOST network is the radio receiver assembly.

(4) MOST communication lines connect each slave unit centering around the master unit to form a MOST network ring.

(5) The master unit sends a wake-up signal to activate each slave unit connected to the MOST network.

HINT:

If a short or open occurs in the MOST network, communication will be interrupted and the system will not operate normally.

(b) Local Bus Communication Outline

*a	Example	*b	Local Bus Communication Line
*c	Master Unit	*d	Slave Unit

(1) Components of the navigation system communicate with each other via the local bus.

(2) The local bus uses a twisted pair of wires for its communication lines.

(3) The master unit of the local bus is the radio receiver assembly.

(c) AVC-LAN Outline

*a	Example	*b	AVC-LAN Communication Line
*c	Master Unit	*d	Slave Unit

(1) Components of the navigation system communicate with each other via AVC-LAN communication.

(2) The AVC-LAN uses a twisted pair of wires for its communication lines.

(3) The master unit of the AVC-LAN is the radio receiver assembly.

(d) CAN Communication Outline

(1) The navigation system uses CAN communication between the radio receiver assembly and ECUs.

DIAGNOSTIC FUNCTION OUTLINE

(a) The navigation system has a diagnostic function (the result is indicated on the master unit).

EXPORT / IMPORT MEMORY POINT FUNCTION OUTLINE

(a) This function allows memory points stored in the radio receiver assembly to be registered to another radio receiver assembly. Memory points stored in the radio receiver assembly can be exported to a USB device. Data exported to a USB device can be imported to another radio receiver assembly using a USB device.

MOBILE ASSISTANT FUNCTION OUTLINE (w/ Mobile Assistant Function)

(a) With a compatible portable device connected via "Bluetooth", this function allows the system to interface directly for voice recognition functions. The steering pad switch assembly is operated to start the Mobile Assistant function and the function is operated by using voice commands.

HINT:

Mobile assistant may not operate or the device may become unresponsive depending on the type of device connected, OS (iOS/Android) version or Google app version.