RTI Control Module
The role of the RTI control module is to calculate the position of the car based on the signals it receives from the GPS antenna, the speed signal from the central electronic module, the gear position and the gyro. The RTI system then works out a route for the selected destination.
There are two models of the RTI system, one old and one new version.
The older system has two units, the RTI control unit and the CD changer. In the new system the CD changer has been replaced by a DVD player which is integrated with the RTI control module.
There is an integrated three dimensional piezo electrical gyro in the RTI control module. This manages data about the movements of the car, such as whether any turnings are made.
Data transmitted on the CAN to the RTI unit from different nodes is:
- vehicle speed
- wheel rotation counter
- back-up (reverse) gear position
- signals from the steering wheel controls
- radio mute
- background lighting.
Gyro and wheel rotation counters are used to calculate the position of the car for shorter periods, if communication with the GPS satellites is lost in a tunnel for example or to assist when there is no GPS signal.
Used in conjunction with map matching, GPS navigation, the gyro and the speed signal, the position can be calculated to an accuracy of +/- 10 meters from the position indicated on the screen.
The traffic message channel (TMC) receiver is integrated in the RTI unit. TMC is a standardized code system for traffic messages such as road works. The Japanese equivalent is called FM multiplex.
There Is No Traffic Information System In The USA.
The TMC antenna is located in the right-hand section of the rear bumper.
The control module is located on the left-hand side of the cargo compartment.
The RTI (road traffic information) control module can be diagnosed.