During a hands free call, the microphone and audio system operate the same way as a standard
OnStar® call. When the answer/end call button is pressed, the audio system will mute; the
OnStar® system will then return the prompt "OnStar® Ready." At this point there are specific
commands set to initiate a cellular call. If the vehicle receives a call when the radio is ON, the
audio system will mute and an audible ring will be heard though the speakers. The call will be
answered when the answer/end call button is pressed.
The VCIM interprets all of the voice-activated commands. A complete list of these commands is
supplied in the information provided to the customer. If the information is not available to
reference, at any command prompt the caller can say "HELP" and the VCIM will return an
audible list of available commands. If the customer concern is not being understood or not being
heard by the OnStar® system, the user should place a call to the OnStar® call center to verify
proper operation of the microphone. Following this description is an example of the commands
and the OnStar® system responses. A complete list of commands is supplied in the information
provided to the customer with the OnStar® system.
Some vehicles equipped with the OnStar® system have the capability of accessing voice
mailboxes and other automated phone systems by means of the steering wheel controls, while the
OnStar® personal calling (OPC) feature is in use. If the Talk or Mute button, depending upon the
vehicle, on the steering wheel controls are depressed during an OPC call, the vehicle
communication module (VCIM) receives the message on the serial data bus from either the radio,
the driver information module, or the body control module (BCM). This message is interpreted as
a request to turn any spoken numbers into dual tone multi-frequency (DTMF) tones to be
delivered over the airwaves to the phone system the user is communicating with. Complete
instructions for operation of these features can be found in the information provided to the
customer with the OnStar® system.
The steering wheel controls are a resistor network that consist of multiple momentary contact
switches and a series of resistors. The switches and resistor network are arranged so that each
switch has a different resistance value. When a switch is pressed, a voltage drop occurs in the
resistor network, which produces a specific voltage value unique to the switch selected, to be
interpreted by either the radio, driver information module, or BCM.
The following is an abbreviated list of features that may have an impact for the technician when
servicing or diagnosing an OnStar® system. For a full list of OnStar® personal calling (OPC)
features, consult the owner's guide provided to the customer with the OnStar® system.
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
The OnStar® personal calling (OPC) system has the capability of responding to the user with
either an automated voice response or with a tone or beep. These 2 types of responses can be
switched back and forth by pressing the answer/end call button, waiting for the system to respond
"OnStar® Ready" and speaking the phrase "voice feedback." The system will then respond,
"voice feedback is now ON/OFF."
OPC Security/System Lock
Customers have the capability to lock their OnStar® personal calling (OPC) system by pressing
the answer/end call button, speaking "security" and entering a 4-digit code. Once this process is
complete, the user must enter the code before OnStar® personal calling is available. In the event
the customer cannot remember their code and is unable to use their system, they can press the blue
OnStar® button and speak to an advisor to unlock the system by means of a discrete cellular call
to the vehicle.
Nametags
Customers have the ability to store telephone numbers within the module, referenced by a
nametag for the convenience of frequently dialed numbers. This process is initiated by pressing
the answer/end call button, waiting for the system response, then speaking the response "store".
The system will respond with "number please" at which time the user should enter the number
desired to be stored. Once complete, saying the word "store" again lets the system know you are
finished entering the number. At this time, the system will elicit the user to assign a nametag to
that number. From this point forward, the user can dial this number by initiating the OnStar®
personal calling (OPC) feature, speaking the word "call," and repeating the nametag assigned. To
delete a nametag, the user should initiate OPC, say "delete" then speak the nametag to be
removed. In the event a nametag cannot be deleted in spite of repeated attempts from several
speakers, the OnStar® module will require replacement.
Mobile Identification Number and Mobile Directory Number
The vehicle communication interface module (VCIM) utilizes 2 numbers for cellular device
identification, call routing and connection, a mobile identification number (MIN) and a mobile
directory number (MDN). The MIN represents the number used by the cellular carrier for call
routing purposes while the MDN represents the number dialed to reach the cellular device.
Although technicians have the capability to change these numbers by means of the scan tool, this
should ONLY be done at the direction of and with explicit instruction from General Motors
Technical Assistance Center (GM TAC).
Placing a Call
To Dial a Number
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
After 3 unsuccessful tries, or if you simply like it better, you can use the "Digit Dial" command to
input digits one at a time. Digit Dial is set up to dial phone numbers like previous OnStar®
Personal Calling Systems.
To Dial a Number Using Digit Dial
To Place a Call Using a Stored Nametag
To Place a Call Using the "Redial" Command
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.
What You Do
What You Hear
Press the white dot button
"OnStar® Ready"
Say "Dial"
"Phone number to dial, please"
Say the entire phone number you wish to dial
with no pauses
OnStar® will repeat the number, then ask
"Yes or No"
Say "Yes" if the phone number was correct,
or "No" to try again
"Dialing," and your call will be connected
What You Do
What You Hear
Press the white dot button
"OnStar® Ready"
Say "Digit Dial"
"First digit to dial, please"
Say the number to be dialed, one digit at a
time
OnStar® will confirm each digit by repeating
it back to you
When finished, say "Dial" again
"Dialing," and your call will be connected
What You Do
What You Hear
Press the white dot button
"OnStar® Ready"
Say "Call"
"Nametag, please"
Say (stored name)
"Calling"
What You Do
What You Hear
Press the white dot button
"OnStar® Ready"
Say "Redial"
"Redialing"
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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