G-Book
Product brand
UnclaimedA Toyota telematics subscription service for connected vehicles, navigation, safety, information and communication services.
Last updated August 31, 2026
Overview
G-Book was a Toyota Motor Corporation telematics service developed for connected vehicles in Japan. It linked Toyota- and Lexus-branded vehicles with Toyota’s online service infrastructure, mobile phones, personal computers and, in some cases, compatible handheld devices. The service used vehicle-installed touch-screen terminals and data communications modules to deliver navigation, information, safety, communication and commerce functions through a subscription model. The service evolved from Toyota’s earlier GAZOO membership and information infrastructure, which was subsequently associated with Toyota Media Service. Its principal consumer proposition was to extend the capabilities of an in-car navigation system beyond static map data. Instead of relying only on periodically replaced CD or DVD navigation media, G-Book-equipped vehicles could download updated maps and online information through a connection established with a driver’s mobile phone or through an embedded data communications module. Toyota also offered a mobile application for selected devices, allowing some service functions to be accessed without a vehicle permanently equipped with the system. G-Book was offered in several configurations, including G-Book, G-Book Alpha and G-Book mX, with corresponding Pro versions. Functions varied by vehicle, terminal and subscription, but included safety and security assistance, vehicle location, stolen-vehicle tracking, emergency notification after airbag deployment, operator assistance, live navigation, traffic information, weather and news, stock-market information, web-based messaging, bulletin boards and electronic commerce. An operator could assist with route guidance and other service requests through Toyota’s support operation. A notable feature of G-Book mX was Probe Communication Traffic Information. The system collected selected driving data, including vehicle speed and position, from participating vehicles and used those aggregated observations to supplement conventional VICS traffic information. Toyota presented the service as a way to identify congestion more accurately, suggest alternative routes and reduce time spent idling in traffic. Japanese-market communications were supported by an embedded DCM operating on KDDI’s CDMA2000 1x network, while higher-speed variants used CDMA2000 1xEV-DO. The DCM also incorporated GPS functionality and supported hands-free communication. The platform was closely connected to Toyota’s broader connected-car strategy but was also adapted for other brands and markets. Toyota made G-Book equipment available as optional equipment across Japanese domestic-market Toyota, Daihatsu and Lexus vehicles from the 2007 model year. Related arrangements extended the service to selected Mitsubishi, Subaru and Mazda vehicles in Japan. In China, Toyota introduced G-Book-equipped Camry vehicles in Beijing and Shanghai in 2009 and also offered the service on Lexus models. China-market functionality was more limited: map updates and music downloads were unavailable, and traffic information was restricted to selected major cities. Lexus operated a related Japanese-market system called G-Link. Introduced with the domestic Lexus launch in 2005, G-Link used technology derived from G-Book Alpha but added Lexus-specific functions such as the Lexus Owner’s Desk, G-Security, HelpNet compatibility, traffic updates and music distribution. Toyota later used related architectural concepts in overseas connected-car services including Lexus Enform with Safety Connect. G-Book services were ultimately discontinued on 31 March 2022, although related Toyota and Lexus connected services continued under newer service names and architectures.
History
G-Book emerged from Toyota’s effort to connect vehicle navigation and information systems to online services. Its infrastructure was based on the earlier GAZOO membership and information service, later associated with Toyota Media Service. Rather than treating navigation as a self-contained device dependent on removable map media, Toyota designed G-Book as a networked service capable of delivering information and updates through telecommunications links. An early technical element was the use of Secure Digital cards. Toyota described a system in which map data and terminal software could be updated through E-TOWER terminals located at convenience stores and other sites. The cards could also carry music, images and games and could be used with compatible consumer electronics. As mobile data connectivity became more practical, G-Book shifted toward online delivery and vehicle-to-service communication. The platform was offered in multiple generations. G-Book Alpha and G-Book Alpha Pro expanded the original service, while G-Book mX and mX Pro added more advanced data communications and traffic functions. Depending on the configuration, a vehicle could use a cellphone connection or an embedded DCM. Japanese systems used KDDI’s CDMA2000 network, and higher-speed variants supported CDMA2000 1xEV-DO. The DCM supplied data connectivity, GPS capability, hands-free communication and emergency reporting functions. G-Book’s service portfolio extended beyond navigation. It included operator-assisted route guidance, safety and security support, vehicle location, stolen-vehicle tracking, airbag-deployment notifications, news, weather, stock-market information, messaging, bulletin boards and online shopping. G-Book mX’s Probe Communication Traffic Information collected selected driving observations from participating vehicles and used them to improve congestion estimates and route recommendations. Toyota also promoted the system as potentially reducing unnecessary idling and associated emissions by helping drivers avoid congestion. The service became part of Toyota’s Japanese domestic vehicle ecosystem. From the 2007 model year, G-Book equipment was available as optional equipment across Toyota, Daihatsu and Lexus vehicles sold in Japan. Toyota also worked with other Japanese manufacturers, including Mitsubishi, Subaru and Mazda, to provide related Japanese-language implementations. Lexus developed its own related product, G-Link, which launched with the Japanese-market Lexus range in 2005 and added Lexus-specific owner support and security functions while drawing on G-Book Alpha technology. Toyota expanded G-Book beyond Japan. The company introduced the service in China on selected Camry vehicles in Beijing and Shanghai in 2009 and also made it available on Lexus models. The Chinese implementation used China Telecom and had a narrower feature set than the Japanese service. Traffic information was limited to Beijing, Shanghai, Guangzhou and Shenzhen, while map updates and music downloads were not available. Related G-Book architecture also influenced later Toyota and Lexus connected services in other markets, including Lexus Enform with Safety Connect in the United States. As automotive connectivity moved toward newer Toyota platforms and service brands, G-Book became a legacy system. Its services ended on 31 March 2022. The brand is therefore historically significant as an early Toyota connected-car and subscription telematics platform, but it is no longer an active consumer service.
- 2022
Service discontinued
[1]G-Book services ended on 31 March 2022.
- 2009
G-Book expands to selected Chinese vehicles
[1]G-Book-equipped Camry vehicles were introduced in Beijing and Shanghai, with related availability on Lexus models in China.
- 2007
G-Book equipment becomes broadly available across Japanese domestic brands
[1]Toyota made G-Book devices available as optional equipment in Japanese domestic-market Toyota, Daihatsu and Lexus vehicles beginning with the 2007 model year.
- 2007
Probe Communication Traffic Information announced
[2]Toyota announced a G-Book mX traffic service that used connected-vehicle data to supplement conventional traffic information and identify alternate routes.
- 2006
Lexus handset compatibility reported
[1]Japanese media reported development of a Lexus-branded cellphone service intended to work with G-Link in cooperation with KDDI.
- 2005
Lexus launches related G-Link service in Japan
[1]G-Link debuted with the Japanese domestic-market Lexus range, using technology based on G-Book Alpha and adding Lexus-specific owner-support and security features.
- 2002
SD-card update infrastructure described
[1]Toyota described the use of Secure Digital cards and E-TOWER terminals for updating navigation maps and terminal software and for transferring selected digital content.
Products and positioning
A connected-vehicle service designed to combine Toyota navigation hardware, mobile or embedded wireless communications, online information and operator support in a subscription-based automotive platform.
Telematics service
G-Book
The original Toyota connected-vehicle service, combining vehicle navigation hardware with online information, communications, safety support and operator assistance. It could connect vehicles with mobile phones, computers and Toyota’s service infrastructure.
Telematics service generation
G-Book Alpha
An expanded generation of G-Book services that supported online navigation and information functions and provided the technical basis for Lexus G-Link. The Pro variant offered enhanced communications capabilities.
Advanced telematics service
G-Book mX
A later G-Book generation centered on embedded data communications and more advanced traffic services. Its distinctive Probe Communication Traffic Information function used data from connected vehicles to improve congestion analysis and route suggestions.
Advanced telematics service
G-Book mX Pro
The Pro version of G-Book mX, associated with DCM-based connectivity, higher-speed mobile data options and functions such as hands-free communication, GPS-based vehicle location and emergency notification.
Lexus telematics service · 2005
G-Link
A related Lexus service for the Japanese market. It used G-Book-derived technology and added the Lexus Owner’s Desk, G-Security, HelpNet compatibility, traffic information and G-Sound music functions.
Brand decisions
2022
Toyota retires the G-Book platformStrategyBackground
Connected-car services were transitioning from the legacy G-Book architecture to newer Toyota and Lexus service platforms.
Action taken
Toyota discontinued G-Book services on 31 March 2022.
Aftermath
G-Book became a discontinued historical service, while related connected-car functionality continued through newer service names and systems.
2009
Toyota extends G-Book to ChinaStrategyBackground
Toyota was adapting its Japanese connected-car model for growing vehicle markets outside Japan.
Action taken
The company introduced G-Book on selected Camry vehicles in Beijing and Shanghai and on Lexus models in China.
Aftermath
The China implementation operated through China Telecom but offered fewer functions than the Japanese version, including limited traffic coverage and no map-update or music-download functions.
2007
Toyota adds Probe Communication Traffic InformationProduct launchBackground
Toyota sought to improve route guidance by combining conventional VICS information with traffic observations gathered from G-Book mX-equipped vehicles.
Action taken
Toyota introduced a service that analyzed vehicle speed and position data to estimate congestion and recommend alternate routes.
Aftermath
The feature became a distinctive part of the G-Book mX proposition and was also presented as a way to reduce time spent idling in congestion.
Recent events
- 2022
G-Book services discontinued[1]
Other
Toyota discontinued the G-Book service on 31 March 2022 after the platform’s connected-car functions had been superseded by newer service architectures.
- 2009
G-Book-equipped Toyota Camry introduced in China[1]
Product launch
Toyota introduced G-Book connectivity in specially identified Camry vehicles in Beijing and Shanghai, with related availability on Lexus models in China.
- 2007
Toyota announces Probe Communication Traffic Information for G-Book mX[2]
Product launch · Other
Toyota described a G-Book mX function that used driving data from connected vehicles to supplement existing traffic information and recommend alternative routes.
Sources2 sources
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