Hummer H3. Manual — part 1202

With RPO UQ7

1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits

for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs .

2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement.

Without RPO UQ7

Front Speakers Inoperative

1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits

for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs .

2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement.

Rear Speakers Inoperative

1. Speaker output circuit from amplifier shorted-Test the appropriate speaker output circuits

for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs .

2. Replace the amplifier. Refer to Radio Speaker Amplifier Replacement.

With RPO U2K

1. Audio signal circuit open-Test the appropriate audio signal for an open. Refer to Circuit

Testing and Wiring Repairs .

2. No audio output from the digital radio receiver-Replace the digital radio receiver. Refer to

Digital Radio Receiver Replacement and Digital Radio Receiver Setup.

3. No digital output from the radio-Replace the radio. Refer to Control Module References

for replacement, setup and programming.

UNABLE TO CONTACT ONSTAR CALL CENTER

Diagnostic Aids

The customer concern may have been due to a lack of cellular service in a given area. A

IMPORTANT: With RPO Y91, Bose amplifier, perform the setup procedure

for the amplifier. Refer to Audio Amplifier Setup.

IMPORTANT: The following procedure assumes all speakers are operative for

all modes of operation except digital radio.

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

failure in the National Cellular Network infrastructure at the time of the customer's failed
connection that has since been repaired may also have been the cause.

If an OnStar® emergency call is able to successfully connect the vehicle to the OnStar®
Call Center when an OnStar® Call Center button press is not, there may be a failure in the
ability of the OnStar® system in the vehicle to be recognized by the local cellular carrier.

If the prompt "OnStar® request ended" is heard, without pressing the white dot button at
the end of the OnStar® keypress, the OnStar® system at one time has made a successful
cellular connection, but was unable to complete the call. If repeated calls are placed with
this result, contact General Motors Technical Assistance Center.

Unable to Contact OnStar Call Center

Step

Action

Value

Yes

No

Schematic Reference: OnStar Schematics
Connector End View Reference: Entertainment/Communication Connector End
Views
DEFINITION: When the OnStar® Call Center button is pressed, no connection is made to
the OnStar® Call Center.

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

1. Press the OnStar® Call Center

button.

2. Wait for the system to either

connect or end the call.

Is a connection made with the
OnStar® Call Center?

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.

-

Go to
Diagnostic
Aids

Go to Step 3

3

Other than the normal progression
tones of the system and the prompt
Unable to Contact OnStar®, were

-

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

any other tones or cellular messages
heard?

Go to Step 4 Go to Step 5

4

1. Record all messages heard from

the OnStar® Call Center button
press.

2. Press the OnStar® emergency

button.

Does the emergency keypress call
make a connection to the OnStar®
Call Center within 10 minutes?

IMPORTANT:

Placing an emergency call to the
OnStar® Call Center should only be
made if the diagnosis of the system
leads to this step. Immediately after an
OnStar® advisor picks up the call, they
should be told that this call is for
diagnostic purposes only and there is
no emergency.

-

Have all
messages
heard during
the course of
the tests
available, use
the scan tool
to access the
STID, ESN
and
Transceiver
I.D. and
contact the
General
Motors
Technical
Assistance
Center

Go to Step 5

5

Inspect the cellular antenna for
exterior damage.
Is the antenna assembly damaged?

-

Go to Step 9 Go to Step 6

6

1. Disconnect the cellular antenna

coax from the vehicle
communication interface
module (VCIM).

2. Disconnect the cellular antenna

coax from the cellular antenna.

3. Measure the resistance from the

center conductor of the coax to
the metal outer shield.

Does the meter read out of limits?

IMPORTANT:

Vehicle may be equipped with
sectioned coax. Test each section and
replace only the faulty section, not the
entire length or coax.

-

Go to Step 7 Go to Step 8

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

ONSTAR VOICE RECOGNITION INOPERATIVE

OnStar Voice Recognition Inoperative

7

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

1 ohms

Go to Step 8

Use the scan
tool to access
the STID,
ESN and
Transceiver
I.D. and
contact the
General
Motors
Technical
Assistance
Center

8

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

-

Go to Step

10

-

9

Replace the cellular antenna
assembly. Refer to Cellular
Communications/Digital Radio
Antenna Replacement.
Did you complete the replacement?

-

Go to Step

10

-

10

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

-

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: OnStar Schematics
Connector End View Reference: Entertainment/Communication Connector End
Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to

Diagnostic

System Check -

Vehicle

1. Turn ON the ignition, with the engine

OFF.

IMPORTANT:

The vehicle must be located in a quiet area.

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3