Hummer H3. Manual — part 1219

During diagnostic testing of the OnStar® system, the technician should ensure the vehicle is
located in an area that has a clear unobstructed view of the open sky and preferably, an area
where analog cellular calls have been successfully placed. These areas can be found by
successfully making an OnStar® keypress in a known good OnStar® equipped vehicle and
confirming success with the OnStar® Call Center advisor. Such places can be used as a
permanent reference for future OnStar® testing.

OnStar® Personal Calling

The hands-free, OnStar® Personal Calling (OPC) cellular phone feature is an additional option to
the OnStar® system. This feature is already embedded within the vehicle communication
interface module (VCIM); however, it must be activated by an OnStar® advisor. This is done
most often during the initial OnStar® configuration, if the home location of the vehicle is in a
geographic area where OPC is available. In the event this feature is not enabled, customers may
connect to the OnStar® Call Center by pressing the blue OnStar® button and asking an advisor if
OPC is available in their area. Users of the Generation 6 OnStar® system can verify the system
has been configured for OPC by pressing the Answer/End Call button, waiting for the system to
respond "OnStar Ready" then speaking "dial". If the system responds "phone unavailable" the
system has not been configured for OPC. All other responses confirm that OPC has been enabled.

Operation of the Hands-Free Cellular Phone

OnStar® Personal Calling (OPC) operates similar to most hand-held cellular phones in that the
availability for its usage is based on minutes or units. The customer must have a current OnStar®
subscription, as this feature cannot be utilized without it. To use OPC, the customer must also
purchase units as outlined in the owner's guide provided with the OnStar® system. When the
customer purchases minutes, an OnStar® advisor loads these minutes into the vehicle
communication interface module (VCIM) over the airwaves at the time of the request or through
a discrete cellular call to the vehicle at a later time. Once loaded into the module, the units may
be used for non-international, outbound cellular phone calls and connection with the OnStar®
Virtual Advisor. Units begin to deplete (1 unit is equal to 1 minute) as the customer makes
outbound phone calls, answers inbound phone calls or while connected to the OnStar® Virtual
Advisor. In addition, units also have an expiration date, depending upon the type of units
purchased. This date is established when the download is performed and any remaining units
expire when the date within the VCIM, which is based on current date and time transmitted by
global positioning system (GPS) satellites, has passed. At any time, the user can press the
Answer/End Call button, say "Units" and verify the number of units remaining.

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

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

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.

OnStar® Steering Wheel Controls

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 is depressed during an OPC call, the vehicle
communication interface module (VCIM) receives the message on the class 2 serial data bus from
either the radio, driver information module or 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.

OPC Features

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 owners guide provided to the customer with the OnStar® system.

Voice Feedback

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

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

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 OPC 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 Generation 6 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 devise. 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 the
General Motors Technical Assistance Center (GM TAC).

Placing a Call

To Dial a Number

Dialing a Phone Number Hands-Free

What You Do

What You Hear

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

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.

Dialing a Phone Number Using Digit Dial

Dialing a Phone Number Using Digit Dial

Dialing a Phone Number Using s Stored Nametag

Dialing a Phone Number Using Stored Nametag

Dialing a Phone Number Using "Redial" Command

Dialing a Phone Number Using "Redial" Command

Operation of the OnStar® Speech Recognition Systems

OnStar® Generation 6 users communicate with 2 speech recognition systems. Speech recognition

Press the white Dot button.

"OnStar Ready."

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 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 White Dot button.

"OnStar® Ready"

Say "Call"

"Nametag please."

Say (stored name).

"Calling"

What You Do

What You Hear

Press White Dot button.

"OnStar® Ready"

Say "Redial".

"Redialing"

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3