Audio System with Navigation: Overview Saab 9-5 II

Cellular Telephone Description and Operation

The mobile telephone control module offers the opportunity to hold phone conversations using a cellular telephone via a vehicle microphone and vehicle speaker system and to operate the most important cellular telephone functions via the infotainment system in the vehicle. The mobile telephone control module is available in two configurations, based on different radio types, mobile telephone control module low for standard CD-radio and a mobile telephone control module high for advanced CD-radios and navigation systems. In principle, both modules provide the same functions

1. Call lists
2. Call handling
3. Steering wheel control
4. Status messages
5. Phone book
6. Bluetooth
7. Speech recognition, including adaptive echo and noise reduction algorithm

All cellular telephone interaction and data transmission to mobile telephone control module is done via Bluetooth. In order to create a connection between the mobile telephone control module and the infotainment system, the mobile telephone control module must be switched on and the cellular telephone logged in. The mobile telephone control module switches itself on and off via the ignition. If the ignition is switched off the mobile telephone control module can be switched on and off via the infotainment system. When a telephone connection is active, the radio sound is switched off. When the telephone connection has ended, the radio sound is switched on again.

Navigation System Description and Operation

Each item in the list below represents topics covered in detail below.

1. Audio System Description
2. Navigation System Components
3. Navigation Radio
4. Global Positioning System (GPS) Antenna
5. Route Guidance
6. Speech recognition
7. Points of Interest

Audio System Description

The navigation radio operates similar to a traditional radio. For information on the audio description and operation, see RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION .

OnStar Description and Operation

This OnStar® system consists of the following components

1. Telematics Communication Interface Module
2. OnStar® button assembly
3. Microphone
4. Cellular Phone Antenna
5. Navigation Antenna
6. Bluetooth ® antenna (If Equipped)
7. Back Up Battery (If Equipped)

This system also interfaces with the factory installed vehicle audio system.

Mobile Identification Number and Mobile Directory Number

The telematics communication interface module utilizes 2 numbers for cellular device identification, call routing and connection, a mobile identification number and a mobile directory number. The mobile identification number represents the number used by the cellular carrier for call routing purposes while the mobile directory number represents the number dialed to reach the cellular device.

Operation of the OnStar® Speech Recognition Systems

OnStar® users communicate with 2 speech recognition systems. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over a phone line. The computer tries to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

1. Personal Calling uses a speech recognition system that resides in the vehicle. When the user presses the phone button, the system states, Ready, and listens for the user command. The user can speak commands to control the hands-free phone.
2. Virtual advisor is a remote speech recognition system that the caller can access by making a phone call. The user connects to virtual advisor by requesting it during personal calling use. The user is then transferred to the virtual advisor server and talks to it via a cellular connection.

The OnStar® speech recognition systems use speech technology that is designed to understand a wide range of American English speakers. Although there is no one right way to speak English, the system will work best when users try to modify their pronunciation should they encounter difficulty. Users who do not obtain good results are advised to try the tips and workarounds found in this section.

Radio/Audio System Description and Operation

The entertainment system on this vehicle may have several different configurations available to it. To determine the specific configuration of the vehicle, please see the Service Parts ID Label, and refer to RPO CODE LIST .

The entertainment system on this vehicle is configured with either a base or an uplevel system. The base and uplevel systems each contain a radio, antenna, speakers, and on some systems an audio amplifier. The uplevel system differs from the base system by providing the customer with enhanced audio system features. Some of those features may include more speakers, an audio amplifier, programmable equalizer, and Digital Audio Broadcast.

Each item in the list below represents topics covered in detail below.

1. Radio Circuit Operation
2. Radio/HVAC Communications
3. Radio/HVAC Controls
4. Antenna System
5. AM/FM Reception
6. Digital Audio Broadcast (if equipped)
7. Speaker Operation
8. Audio Amplifier (if equipped)
9. Radio Data System (RDS) (if equipped)
10. Radio Data System (RDS) Messages (if equipped)
11. MP3/CD Formatting Information for MP3/CD Radios (if equipped)
12. Integral Multi Disc CD Changer (if equipped)
13. Rear Seat Audio (RSA) (if equipped)
14. Theft Deterrent
15. Radio Error Messages
16. OnStar (If equipped)
17. Universal Handsfree Phone (if equipped)
18. Steering Wheel Controls (if equipped)
19. Auxiliary Input Jack (if equipped)
20. USB Port (if equipped)
21. Multimedia Player Interface Module (if equipped)
22. Speed Controlled Volume (SCV) (if equipped)

Speaker Operation

Speakers turn electrical energy into mechanical energy to move air, using a permanent magnet and an electromagnet. The electromagnet is energized when the radio or amplifier (if equipped) delivers current to the voice coil on the speaker. The voice coil will form a north and south pole that will cause the voice coil and the speaker cone to move in relation to the permanent magnet. The current delivered to the speaker is rapidly changing alternating current (A/C). This causes the speaker cone to move in two directions producing sound. When the speaker is at rest, such as when the volume at a minimum value, the voltage applied to each side of the speaker is half of the ignition system voltage. This way, the speaker cone can be moved in either direction.

Amplifier Operation

The purpose of the amplifier is to increase the power of a voltage or current signal. The output signal of an amplifier may consist of the same frequencies as the input signal or it may consist of only a portion of the frequencies as in the case of a subwoofer or midrange speaker. The radio creates a low level stereo audio output signal, which is sent at the user defined volume level to the audio amplifier. The audio amplifier amplifies the signal and sends it to the appropriate speakers.

Video Entertainment System Description and Operation

Each item in the list below represents topics covered in detail below

1. Seatback Display Circuit Operation
2. Seatback Display System Components
3. Video Screens
4. Remote Control
5. Wireless Headphones
6. Video Inputs Only

Steering Wheel Controls Description and Operation

The steering wheel control switches duplicate the function of the primary controls of the associated component, through a network of momentary contact switches and a series of resistors. The body control module (BCM) supplies voltage to the switches and monitors the return signal. When a switch is pressed, a specific voltage drops across the resistor unique to that switch. The BCM identifies the switch selected and sends a serial data message to the component controlled by the switch, activating the feature.

This section is intended to diagnose the circuits between the BCM and the steering wheel control switches.

AUDIO SYSTEM WITH NAVIGATION DTC INDEX

Circuit/System Description

The radio receives a vehicle speed signal from the electronic brake control module (EBCM) in order to correlate actual vehicle speed to the movement of the vehicle calculated by the navigation system and reported serial data.

Description and Operation

NAVIGATION SYSTEM DESCRIPTION AND OPERATION

The navigation radio communicates with the radio display assembly via serial data. If the radio receives an improper status response message, DTC B1020 will set.

This DTC indicates an fault in the display. No external circuits are involved.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using DMM, each audio channel circuit will measure approx. 6.5 V DC. The sound generated by the system is produced by a varying alternating current (AC) which is centered around the DC current bias on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1 V AC and less, where constant music may measure 3 V AC and slightly higher. The amplifier can not set DTCs.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The digital audio broadcast (DAB) radio receiver receives a digital radio signal via the digital radio antenna. The digital radio antenna is mounted in the rear window (4D). This signal is passed to the DAB module through the digital radio antenna cable. The DAB module sends a varying Alternating Current (AC) mV signal through separate left and right audio circuits (+ and -) to the radio. The voltage amount and rate of change is dependent upon the type of signal being received. The radio then processes these signals and passes the audio to the amplifier.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The multi-band antenna is located in the rear window. The radio antenna is enabled when the radio is turned on. The radio provides battery voltage to the antenna using the center conductor of the antenna coaxial cable. When a 12 V signal is seen on the center conductor of the antenna cable, both AM and FM signals are amplified.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

This DTC is generated by the module when the Theft Protection is activated. This occurs when the VIN as received over the data communication circuit and the VIN as stored in the module memory do not match. This also occurs when no VIN is received over the data communication circuit. The only circuit required is the communication line.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

A remote 3.5 mm auxiliary stereo jack allows playback of audio signals from remote devices (e.g., laptop computer, iPod, MP3 player, etc.). When a remote device audio mini-plug is inserted in the remote auxiliary jack, an internal mechanical switch closes completing the auxiliary jack detect circuit to the radio. The radio automatically detects the input through the circuit and the device begins playing. The radio receives the devices audio signals on the auxiliary input 1 (left) signal circuit and auxiliary input 2 (right) signal circuit. If equipped with a multimedia player interface module, the auxiliary inputs that would normally connect directly to the radio will have the multimedia player interface module inline of those connections. This means that the auxiliary inputs for the radio connect to the multimedia player interface module, and the multimedia player interface module connects to the radio, passing along the audio and USB signals. Both the radio and the multimedia player interface module can set these DTCs.

The auxiliary audio jack has an internal mechanical detection switch that will connect the detection signal on the auxiliary audio jack to ground when an auxiliary mini-plug is inserted.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The radio amplifier control circuit provides varying pulse width modulated (PWM) signals to control overall muting of the amplifier. The PWM signals are varying duty cycle percentages ranging from 0-100%. A low duty cycle unmutes all amplifier channels and a high duty cycle mutes all amplifier channels. The radio monitors the amplifier control circuit for faults. When a fault is detected the radio sets the appropriate DTC.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The backup battery supplies voltage to the telematics control module of the communication interface to make it possible to make a call if the main battery has been disabled in a collision.

ONSTAR DESCRIPTION AND OPERATION

The OnStar® keypad consists of 3 buttons: call/answer, OnStar® Call Center and OnStar® SOS. The telematics control module for the communication interface supplies 10 V to the OnStar® keypad via the telematics keypad supply voltage circuit. When any of the buttons is pressed, it closes a circuit via a resistor, which returns a specific voltage to the telematics control module for the communication interface via the telematics keypad signal circuit. The telematics control module of the communication interface can identify which button was actuated based on the voltage value that is returned.

ONSTAR DESCRIPTION AND OPERATION

The telematics control module for the communication interface supplies voltage to the mobile telephone microphone on the mobile telephone microphone signal circuit. When the microphone is used, voice data from the user is sent back to the telematics control module for the communication interface on the signal circuit. The telematics control module for the communication interface produces a ground for the mobile telephone microphone via the low reference cable.

ONSTAR DESCRIPTION AND OPERATION

The cellular phone, navigation, and digital radio antenna is connected to the telematics communication interface control module. This module supplies 5 V to the cellular phone, navigation, and digital radio antenna to power the internal amplifier. When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the GPS signal to both the telematics communication interface control module and the navigation radio. The navigation radio supplies 5 V through the GPS antenna coaxial cable to the navigation signal splitter to power the internal navigation radio signal amplifier.

Onstar - Telematics Communication Interface Control Module

1. The ignition is in the RUN or ACCESSORY position.
2. System voltage is greater than 9 V and less than 16 V.
3. The above conditions are present for greater than 1 second.

1. «ONSTAR DESCRIPTION AND OPERATION»(ref-653672-S23505001582014090100000)
2. «RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION»(ref-653672-S39376120492014090100000)

The mobile telephone antenna is shorted to the telematics control module for the communication interface with an RG-58 coaxial cable. The telematics control module for the communication interface detects data from the mobile telephone antenna each second.

ONSTAR DESCRIPTION AND OPERATION

The OnStar® button assembly consists of 3 buttons, Call/Answer, OnStar® Call Center, and OnStar® Emergency. The telematics communication interface control module supplies the OnStar® button assembly with 10 V via the Telematics keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the Telematics Button Assembly signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been activated.

ONSTAR DESCRIPTION AND OPERATION

The Bluetooth® antenna is a small, fixed antenna directly connected to the mobile telephone control module and is used to send and receive signals from a Bluetooth®- activated mobile telephone. The antenna has no wiring and is not located outside the car.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

The Bluetooth® antenna is a small, fixed antenna directly connected to the telematics control module for the communication interface and is used to send and receive signals from a Bluetooth®-activated mobile telephone. The antenna has no wiring and is not located outside the car.

ONSTAR DESCRIPTION AND OPERATION

The body control module (BCM) monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components and/or incorrect operation can occur when the voltage is out of range.

STEERING WHEEL CONTROLS DESCRIPTION AND OPERATION

The body control module (BCM) supplies voltage to the steering wheel control switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the switch selection and activates the feature.

STEERING WHEEL CONTROLS DESCRIPTION AND OPERATION

The body control module (BCM) monitors the steering wheel control signal circuit voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected, the BCM will ignore the switch command.

STEERING WHEEL CONTROLS DESCRIPTION AND OPERATION

The Bluetooth antenna is a small fixed antenna connected directly to the mobile telephone control module and is used to send and receive signals from a Bluetooth enabled cellular phone. The antenna is internal to the vehicle.

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth functionality of their phone. The pairing process must only be done one time for each phone, unless that phone's information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

The mobile telephone control module uses the microphone to allow driver communication with the cellular telephone. The cellular telephone is connected to the mobile telephone control module via Bluetooth.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

The mobile telephone control module sends the telephone call via a hardwired signal to the radio. The radio mutes the audio source and transmit the telephone call to the speakers.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

The mobile telephone control module uses the cradle to charge the cellular telephone.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

The Digital Audio Broadcast (DAB) radio receiver receives a digital radio signal via the digital radio antenna. The digital radio antenna is mounted in the rear window. This signal is passed to the DAB module through the digital radio antenna coax. The DAB module sends a varying Alternating Current (AC) mV signal through separate left and right audio circuits (+ and -) to the radio. The voltage amount and rate of change is dependent upon the type of signal being received. The radio then processes these signals and passes the audio to the amplifier.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module receives information from a specific cellular phone and navigation antenna located on the outside of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

ONSTAR DESCRIPTION AND OPERATION

The telematics communication interface control module provides the cellular phone microphone with a supplied voltage on the cellular phone microphone signal circuit. When the cellular phone microphone is in use, voice data from the user is sent back to the telematics communication interface control module on the signal circuit. The telematics communication interface control module provides a ground for the microphone via the low reference wire.

ONSTAR DESCRIPTION AND OPERATION

When an OnStar® key is pressed, a serial data message is sent to the audio system to mute all radio functions and output OnStar® originated audio. After the audio system is muted, the telematics communication interface control module transmits signals to the audio system on the audio signal and audio common circuits.

ONSTAR DESCRIPTION AND OPERATION

The global positioning system antenna is connected to the navigation radio by a coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

NAVIGATION SYSTEM DESCRIPTION AND OPERATION

ONSTAR DESCRIPTION AND OPERATION

The telematics communication interface control module has the capability of commanding the horn, initiating door lock/unlock, or operating the exterior lamps using the serial data circuits. These functions are commanded by the OnStar® Call Center per a customer request.

ONSTAR DESCRIPTION AND OPERATION

The OnStar® button assembly consists of 3 buttons, Call/Answer, OnStar® Call Center, and OnStar® Emergency. The telematics communication interface control module supplies the OnStar® button assembly with 10 V via the Telematics keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the Telematics Button Assembly signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been activated.

ONSTAR DESCRIPTION AND OPERATION

ONSTAR, GPS, XM, AM/FM-CONNECTOR IDENTIFICATION AT CIM

CONNECTOR IDENTIFICATION AT ONSTAR ANTENNA BASE

The wireless communication interface antenna is a small fixed antenna connected directly to the mobile telephone control module and is used to send and receive signals from a wireless communication interface enabled cellular telephone. The antenna utilizes no cabling and is not external to the vehicle.

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the wireless communication interface functionality of their phone. The pairing process must only be done one time for each phone, unless that phone's information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

CELLULAR TELEPHONE DESCRIPTION AND OPERATION

AM and FM radio reception is dependent on the following components

1. Radio antenna amplifier
2. Radio Antenna
3. Coax cable between the radio antenna and the radio
4. Radio

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using DMM, each audio channel circuit will measure approx. 6.5 V DC. The sound generated by the system is produced by a varying alternating current (AC) which is centered around the DC current bias on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1 V AC and less, where constant music may measure 3 V AC and slightly higher. The amplifier can not set DTCs.

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module is a cellular device that allows the user to communicate data and voice signals over the national cellular network. When an OnStar keypress is made, the telematics communication interface control module activates and connects the system to the cellular carriers communication system by interacting with the national cellular infrastructure. The module sends and receives all cellular communications over the cellular phone and navigation antenna and cellular antenna coax.

ONSTAR DESCRIPTION AND OPERATION

The rear seat entertainment system uses the car radio when playing DVD movies and to transmit video signals to the backrest screens. When the radio is switched OFF, the DVD screens in the backrests receive a voltage signal indicating system status from the radio via the signal circuit for antenna activation. The video control circuits for high and low are used to transmit DVD images to the backrest screens.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The infrared remote signal is used to transmit signals from the rear seat entertainment remote control via pulse width modulated (PWM) signals to the radio. When a key on the remote is pressed, the remote control sends an infrared message to the infrared transmitter located in the DVD display. The infrared transmitter will convert these infrared signals into a frequency and send the message to the radio via the remote infrared signal circuits (+) and (-).

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The DVD display seat headrest module contains infrared transmitters for the wireless headphones and the infrared receiver for the video system remote control. The audio that is sent over the DVD audio control circuits is a varying alternating voltage. The DVD seat headrest module processes the signal and transmits the audio signals to the headphones. If the display is in the closed position, the infrared signals will not be available for the operation of the wireless headphones and the remote control.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

The telematics communication interface control module is capable of interpreting voice commands received over the cellular microphone circuits. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over the cellular communication network. The module attempts to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

ONSTAR DESCRIPTION AND OPERATION

The body control module (BCM) supplies voltage to the audio steering wheel control switches and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the switch selection and activates the feature.

STEERING WHEEL CONTROLS DESCRIPTION AND OPERATION

SYMPTOM DESCRIPTION

The symptom can be

1. The navigation screen shows Belgium at start up (default setting)
2. The stored addresses are removed
3. The clock time in the display has been changed 1 or more hours