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Home >> Volvo >> 2000 >> S80 2.9 L6-2.9L VIN 94 B6294S >> Repair and Diagnosis >> Accessories and Optional Equipment >> Cellular Phone >> Description and Operation >> Audio, Telephone, RTI >> Input and Output Signals

Input and Output Signals






Input and output signals





System overview
1. Rheostat
2. LSM
3. Sensor back-up (reverse) gear
4. Ignition switch
5. Data link connector (DLC)
6. Hands-free loudspeaker
7. Handset
8. Telephone antenna
9. Hands-free microphone
10. Car phone module
11. Car phone box
12. CCM
13. Sun sensor
14. Parking brake sensor
15. DIM
16. Display
17. Keypad in the steering wheel
18. steering wheel module
19. RTI control
20. Loudspeakers
21. Separate amplifier
22. CD changer Audio
23. Audio control module
24. TV receiver
25. Sub-antenna in bumper
26. Antenna in rear windshield
27. CD ROM changer
28. GPS antenna
29. Display
30. RTI unit
31. ABS
32. Vehicle speed sensor (VSS)
33. Sensor back-up (reverse) gear
34. TCM
35. Central electronic module

Input signals PHM
Audio signals from the hands-free microphone (via telephone box).
GSM communication from the telephone antenna (via telephone box).
Audio signal from the handset.
The central electrical module (CEM) sends the following signals to the phone module (PHM):
- The signal controlling the keypad lighting.
- The vehicle speed, taken from ABS, controls the telephone system sound level (ASC - Automatic Sound Control).
- Identification of the ignition key transponder for access to PIN.
- Control signals from the keypad in the steering wheel hub.
- Global parameters.
- Signals from VIDA via data link connector (DLC).
The signal controlling the keypad lighting is a combination of the signal from the sun sensor which is connected to the CCM and the rheostat connected to the light switch module.
The keypad in the Steering wheel hub are connected to the steering wheel module which sends to the phone module (PHM) keypad. When the phone module is activated the telephone system has precedence and the steering wheel audio keypad is put out of function. If the phone module receives a signal indicating that the steering wheel module does not function all signals from the steering wheel module will be ignored.
Global parameters can be, for example, language selection.

Output signals PHM
GSM communication to the telephone antenna (via telephone box).
Audio signal to hands-free loudspeaker.
Audio signal to the handset.
The phone module sends the following signals.
- Text messages concerning the telephone system are sent from the phone module to the Driver information module (DIM) which displays them.
- In event of a call the audio module receives a signal and activates the audio system mute function.
- Signals to VIDA via data link connector (DLC).
If the telephone system stops functioning it will stop sending the phone module communicating signal which causes the central electrical module (CEM) to inform other modules that the phone module does not function. If the Driver information module (DIM) receives 20 such messages and the ignition key is in positions I or II a warning message will be displayed.
If the phone module receives a signal that the Driver information module (DIM) does not function the telephone system functions are reduced. In this situation calls may only be made and received.

Input signals Audio module (AUM)
Audio signal from CD changer.
Audio signal and the signal from the TV receiver for displaying the station setting. The sound is reproduced in multi channel mono through all loudspeakers.
Audio signal from RTI unit. Sound reproduced in driver's side door-mounted loudspeaker.
Radio reception FM/AM from antenna in the rear windshield.
Radio reception FM from the sub-antenna in the rear bumper, when the diversity is activated (HU-4XX and upwards).
The central electrical module (CEM) sends the following signals to the audio module (AUM):
- Signal controlling the keypad lighting (depending on sun sensor and rheostat).
- Signal controlling the display lighting (depending on sun sensor and rheostat).
- The vehicle speed controls the telephone system sound level (ASC - Automatic Sound Control).
- In event of a telephone call a signal from the phone module activates the audio system mute function.
- When the phone module is activated the module sends a signal which disables the steering wheel hub keys controlling the audio module.
- Global parameters.
- Signals from VIDA via data link connector (DLC).

Output signals Audio module (AUM)
Audio signal to all the loudspeakers (depending on equipment).
Audio signal to a separate power amplifier (depending on equipment).
Control signal for selecting disc, track, search for CD changer.
Signal for station setting in the TV receiver.
Signals to VIDA via central electrical module (CEM) and data link connector (DLC).

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.

Output signals RTI
Video signal from the TV receiver to the display screen.
Digital signal with video information from CD-ROM changer to the display screen.
Digital signal with audio information from CD-ROM changer to the audio module for reproduction in the driver's door loudspeaker.
Control signal for selecting disc, track, search for CD ROM changer.
Signal for picture setting in the TV receiver.

Note! Note!The signal comes from the remote control signals and goes via the audio module.

Signals to VIDA via central electrical module and data link connector (DLC).

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