Hummer H2. Manual - part 218

8: If the Cellular Telephone Voice Low Reference circuit is shorted to voltage the vehicle communication
interface module (VCIM) has been damaged and requires replacement.

No (or Noisy) OnStar Audio

Step

Action

Yes

Schematic Reference:OnStar Schematics
Connector End View Reference:Cellular Communication Connector End Views
DEFINITION: This procedure is for diagnosing problems during OnStar(R) audio following a button
press from the OnStar(R) button assembly.

Did you perform the Cellular Communication Diagnostic
System Check?

Go to
Step 2

Go to Diagnostic System
Check - Cellular
Communication

1. Turn ON the ignition, with the engine OFF.

2. Turn ON the radio.

3. Set volume to a comfortable level.

4. Press the OnStar(R) Center Call button.

Can the "Connecting to OnStar" message be heard playing
through the audio system at all?

Go to
Step 3

Go to Step 5

Tune the radio to a known good station.
Can the audio be heard through all speaker channels?

Go to
Step 4

Go to Diagnostic Starting
Point - Entertainment in
Entertainment

Test the cellular telephone voice low reference circuit for an
open. Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to
Step 11 Go to Step 9

Is any distortion heard?

Go to
Step 7

Go to Step 6

Test the cellular telephone voice signal circuit for a short to
ground. Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to
Step 11 Go to Step 7

Test the cellular telephone voice signal circuit for an open or
short to voltage. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to
Step 11 Go to Step 8

Test the cellular telephone voice low reference circuit for a
short to voltage. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to
Step 10 Go to Step 9

Inspect for poor connections at the harness connector of the
vehicle communication interface module (VCIM). Refer to
Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring Systems.

Go to

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

GLOBAL POSITIONING SYSTEM (GPS) DATA NOT CURRENT OR INACCURATE

Diagnostic Aids

The GPS Signal title on the scan tool will display a Yes or No dependent upon whether or not the module
sees an increment of the seconds transmitted by global positioning system (GPS) signals to the vehicle
communication interface module. Upon entering this screen, the GPS Signal title will automatically
display Yes, regardless of the presence of time increment, for at least 2 seconds, while the algorithm in
the scan tool determines the status of the clock. If increment is found, Yes is continually displayed. If the
clock remains static, No is displayed. The scan tool looks for increment every second, regardless of
current display.

Inaccurate or aged GPS position concerns made by a customer which are no longer present may have
been due to the temporary loss of GPS signal reception by the vehicle. Conditions such as driving through
tunnels or parking structures while making an OnStar(R) keypress will restrict the navigation antenna
from a clear view of the satellites in the sky and may have caused this temporary data loss.

Global Positioning System (GPS) Data Not Current or Inaccurate

Did you find and correct the condition?

Step 11 Go to Step 10

Replace the VCIM. Refer to Communication Interface
Module Replacement .Did you complete the repair?

IMPORTANT:

Perform the OnStar(R) setup procedure.

Go to
Step 11 -

Operate the system in order to verify the repair.
Did you find and correct the condition?

System
OK

Go to Step 2

Step

Action

Values

Yes

Schematic Reference:OnStar Schematics
Connector End View Reference:Cellular Communication Connector End Views

Did you perform the Cellular Communication
Diagnostic System Check?

Go to Step 2

Go to Diagnostic

System Check -

Cellular

Communication

With a scan tool, observe the GPS signal status
indicator in the GPS Data Display menu, for at least
10 seconds.Does the indicator display Yes?

IMPORTANT:

It is important to have the vehicle in an open
outside area where a cellular call can be
successfully placed and global positioning
system (GPS) data can be received from
satellites. It is also necessary to inform the
OnStar(R) Call Center advisor that this call is for
vehicle diagnostic purposes.

Go to Step 3

Go to Step 6

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

ONSTAR RECONFIGURATION

1. Press the OnStar(R) Call Center button.

2. Ask the OnStar(R) Call Center advisor if they

have received GPS data.

Has the advisor received GPS data?

Go to Step 4

Go to Step 5

Ask the OnStar(R) Call Center advisor to verify
your position.
Is the location provided by the OnStar(R) Call
Center advisor within a reasonable distance from
the actual location of the vehicle?

Go to

Diagnostic

Aids

Go to Step 10

Ask the OnStar(R) Call Center advisor if this call
was a fail to voice.
Was the call a fail to voice?

Contact the

General Motors

Technical

Assistance

Center

Go to Step 6

1. Disconnect the navigation antenna coax from

the cellular and navigation antenna.

2. Disconnect the navigation antenna coax from

the vehicle communication interface module
(VCIM).

3. Measure the resistance from the center

conductor of the coax to the metal outer
shield.

Does the meter read out of limits?

Go to Step 7

Go to Step 8

Measure the resistance of the navigation antenna
coax center conductor from end to end.
Does the resistance measure greater than the
specified value?

1.0

ohm

Go to Step 8

Go to Step 9

Replace the navigation antenna coax.
Did you complete the replacement?

Go to Step 11

Replace the cellular and navigation antenna
assembly. Refer to Antenna Assembly
Replacement - Cellular and Navigation .
Did you complete the replacement?

Go to Step 11

Replace the VCIM. Refer to Communication
Interface Module Replacement .
Did you complete the replacement?

Go to Step 11

Operate the system in order to verify the repair.
Did you correct the condition?

Go to Step 2

IMPORTANT: The vehicle communication interface module (VCIM) has a specific set of

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

1. Install the scan tool. Use the special functions menu in order to perform the VCIM setup procedure for

this vehicle.

2. Move the vehicle to an open area that is away from tall buildings with a clear view of unobstructed sky.

Allow the vehicle to run for 10 minutes.

3. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic

serial number (ESN) from the new VCIM.

4. Press the blue OnStar(R) button to connect to the OnStar(R) Call Center. Tell the advisor that this vehicle

has received a new VCIM and ask the advisor to perform the following procedure:

Add the new STID and the ESN to update the customers account.

Follow any additional instructions from the OnStar(R) advisor.

Ask the advisor to activate the OnStar(R) Personal Calling feature, if available.

5. The default language for voice recognition in the generation 5 OnStar module is English. To change the

language resident in the module, refer to Service Programming System (SPS) in Programming and
Setup.

REPAIR INSTRUCTIONS

ANTENNA ASSEMBLY REPLACEMENT - CELLULAR AND NAVIGATION

Removal Procedure

1. Lower the headliner. Refer to Headliner Replacement in Interior Trim.

unique numbers that tie the module to the vehicle it resides in. These numbers,
the 10-digit station identification and 11-digit electronic serial number, are used
by the National Cellular Network and OnStar(R) to identify the specific vehicle.
Because these numbers are tied to the vehicle identification number of the
vehicle, these parts should NOT be exchanged with those of another vehicle.
After replacing the VCIM, it is essential to reconfigure the OnStar(R) system.
Failure to reconfigure the system will result in an additional customer visit for
repair. In addition, pressing and holding the white dot button on the keypad will
not reset this version of the OnStar(R) system. This action will cause a DTC to
set.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

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