Input Signals RTI
Position signal from GPS antenna.
Signals for the TMC/FM-MPX from the sub-antenna in the rear bumper.
Signals for FM-MPX from the antenna in the rear windshield.
Control signal from the remote control via the display screen.
Video signal from the TV receiver.
Digital signal which contains information about the image and sound and the system software from the CD ROM changer.
The central electrical module (CEM) sends the following signals to the RTI:
- Signal for setting the light strength from the rheostat connected to the light switch module (LSM).
- Signal if back-up (reverse) gear is engaged.
- Signal if the parking brake is engaged from the Driver information module (DIM).
- Vehicle speed signal from ABS.
- Control signals from the RTI control via the steering wheel module.
- Global parameters.
If the car is equipped with automatic transmission the back-up (reversing) lamp switch is connected to the Transmission control module (TCM) which sends a signal to the central electrical module (CEM) if the back-up (reverse) gear is engaged. If the car is equipped with a manual transmission the back-up (reversing) lamp switch is connected directly to the central electrical module (CEM).
If the parking brake is applied it indicates that the car is stationary and that the TV receiver may be used.
The vehicle speed signal, from the ABS, is used so that the RTI can give the driver an accurate position. The signal is combined with gyro signals, GPS signals and the map information. If the car is equipped with an automatic transmission the RTI also receives a vehicle speed signal from the Transmission control module (TCM).
The back-up (reverse) gear engaged signal is used by the RTI unit to calculate which direction the car is traveling in. The GPS signal positioning ability is not accurate enough to be able to register short backwards movements. The RTI unit gyro cannot determine whether the car movement is backwards or forwards. If the car changes direction without reversing the gyro will detect it.