Hummer H3. Manual — part 1186

DTC B1025, B1035, B1045 OR B1055

Circuit Description

When the radio is powered up, the radio supplies low level audio signals to the speakers. If the
vehicle is equipped with an audio amplifier, the amplifier will boost the signal sent to the
speakers. The radio tests the speaker output circuits for a short to voltage or ground.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

DTC B1025 Audio Output 1 (Left Front) Circuit

DTC B1035 Audio Output 2 (Right Front) Circuit

DTC B1045 Audio Output 3 (Left Rear) Circuit

DTC B1055 Audio Output 4 (Right Rear) Circuit

Conditions for Running the DTC

The test is performed when the radio switches from OFF to ON. The radio will continue to test
for the fault once every 0.5 seconds.

Conditions for Setting the DTC

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

1. Install a scan tool.

2. Turn ON the ignition, with the

engine OFF.

3. With a scan tool, configure the

module to the vehicle.

Does the DTC reset?

Go to Step 3

System OK

3

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

System OK

-

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2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

The radio sets a current status for this DTC when a short to ground or voltage is detected on any
of the speaker channels for 1.5 seconds.

Action Taken When the DTC Sets

No sound is present from one or more of the speakers.

Conditions for Clearing the DTC

The condition is no longer present for 5 seconds.

Test Description

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

2: The DTC descriptor indicates which speaker output circuit set the DTC.

DTC B1025, B1035, B1045 or B1055

Step

Action

Yes

No

Schematic Reference: Radio/Navigation System 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

2

1. Disconnect the appropriate speaker.

2. Turn ON the radio.

3. Test the speaker output circuit for a

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

Did you find and correct the condition?

Go to Step 6

Go to Step 3

3

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

Go to Step 6

Go to Step 4

Inspect for poor connections at the harness

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

DTC B1259

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC B1259

Antenna Ground Circuit

Diagnostic Fault Information

DTC B1259

Circuit/System Description

The antenna signal circuit is a coaxial cable that carries the radio signal information received by
the antenna. The antenna cable also provides a path for DC current for powering the antenna.

Conditions for Running the DTC

4

connector of the radio. Refer to Testing
for Intermittent Conditions and Poor
Connections and Connector Repairs .
Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

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

Go to Step 6

-

6

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

System OK

Go to Step 2

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Antenna Signal

1

1

1

-

1. Sets code B1259

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

This test is run every 300 milliseconds.

Conditions for Setting the DTC

The digital radio receiver (DRR) detects an antenna fault.

Action Taken When the DTC Sets

The radio displays "No XM Signal" or "Check Antenna".

Conditions for Clearing the DTC

The condition must be corrected.

The DTC clears after 100 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Special Tools Required

EL-48028 Digital Radio Test Antenna

Circuit/System Testing

1. Ignition OFF, disconnect the antenna coax from the digital radio receiver (DRR). Connect

the test antenna to the DRR.

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3