Hummer H3. Manual — part 1195

than the specified value?

Go to Step 4 Go to Step 5

4

Measure the voltage from the
cellular microphone signal circuit to
the drain wire circuit.
Does the voltage measure greater
than the specified value?

9 V

Go to Step 7 Go to Step 6

5

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

-

Go to Step 13 Go to Step 8

6

Test the drain wire circuit for an
open or short to ground. Refer to
Circuit Testing and Wiring
Repairs .
Did you find and correct the
condition?

-

Go to Step 13 Go to Step 9

7

Test the drain wire for a short to
ground.
Did you find and correct the
condition?

-

Go to Step 13

Go to Step

10

8

1. Leave the microphone

disconnected.

2. Disconnect the vehicle

communication interface
module (VCIM) connector C2.

3. Test the cellular microphone

signal circuit and drain wire
circuit for a short together.

Did you find and correct the
condition?

-

Go to Step 13 Go to Step 9

9

Inspect for poor connections at the
harness connector of the cellular
microphone. Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector

-

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

NO (OR NOISY) ONSTAR AUDIO

Test Description

The number below refers to the step number on the diagnostic table.

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

Repairs .
Did you find and correct the
condition?

Go to Step 13

Go to Step

11

10

Inspect for poor connections at the
harness connector of the VCIM.
Refer to Testing for Intermittent
Conditions and Poor Connections
and Connector Repairs .
Did you find and correct the
condition?

-

Go to Step 13

Go to Step

12

11

Replace the cellular microphone.
Refer to Mobile Telephone
Microphone Replacement.
Did you complete the replacement?

-

Go to Step 13

-

12

Replace the VCIM. Refer to
Control Module References for
replacement, setup and
programming.
Did you complete the replacement?

-

Go to Step 13

-

13

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
DEFINITION: This procedure is for diagnosing problems during OnStar® audio following
a button press from the OnStar® button assembly.

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

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® 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

3

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

Go to Step 4

Go to
Diagnostic
System Check -
Vehicle

4

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

Go to Step 11

Go to Step 9

5

Is any distortion heard?

Go to Step 7

Go to Step 6

6

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

Go to Step 11

Go to Step 7

7

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

Go to Step 11

Go to Step 8

8

Test the cellular telephone voice low
reference circuit for a short to voltage.
Refer to Circuit Testing and Wiring
Repairs .
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

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

NO GLOBAL POSITIONING SYSTEM (GPS) RECEPTION

No Global Positioning System (GPS) Reception

9

interface module (VCIM). Refer to Testing
for Intermittent Conditions and Poor
Connections and Connector Repairs .
Did you find and correct the condition?

Go to Step 11

Go to Step 10

10

Replace the VCIM. Refer to Control
Module References for replacement, setup
and programming.
Did you complete the repair?

Go to Step 11

-

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

No

Schematic Reference: Radio/Navigation System Schematics
Connector End View Reference: Entertainment/Communication Connector End
Views
DEFINITION: When using the navigation system, the Global Positioning System (GPS)
icon does not appear on the navigation radio.

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

1. Move the vehicle to an open

area outside of the building.

2. Turn ON the ignition. The

Navigation screen appears on
the navigation radio.

3. The display should show the

current position of the vehicle.
If the red GPS icon appears on
the screen, this indicates that
the vehicle does not have GPS
reception.

-

Go to Testing
for
Intermittent
Conditions
and Poor

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3