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Hummer H2. Manual - part 272

This test is run every 125 milliseconds.

Conditions for Setting the DTC

The BCM detects a switch voltage that is higher than normal.

Action Taken When the DTC Sets

The BCM will ignore the switch command.

Conditions for Clearing the MIL/DTC

The DTC will become history if the BCM no longer detects a circuit malfunction.

The history DTC will clear after 100 fault free ignition cycles.

The DTC can be cleared with a scan tool.

Test Description

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

3: Tests for the proper operation of the circuit in the low voltage range.

DTC B2815

Step

Action

Value

(s)

Yes

Schematic Reference: Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio
System Schematics (Class 2 Amplifier)
Connector End View Reference: Entertainment Connector End Views

Did you perform the Diagnostic System
Check - Entertainment System?

Go to Step 2

Go to Diagnostic

System Check -

Entertainment

System

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

3. With a scan tool, observe the SWC

Switch Voltage parameter in the Body
Control Module data list.

Does the scan tool indicate that the SWC
Switch Voltage parameter is near the
specified value?

0 V

Go to Testing for

Intermittent

Conditions and Poor

Connections in Wiring

Systems

Go to Step 3

CAUTION:

Refer to SIR Caution in Cautions and
Notices.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

1. Disable the SIR system. Refer to SIR

Disabling and Enabling Zone 1 and
SIR Disabling and Enabling Zone 3
in SIR.

2. Turn OFF the ignition.

3. Disconnect the left steering wheel

controls.

4. Turn ON the ignition, with the engine

OFF.

5. With a scan tool, observe the SWC

Switch Voltage parameter.

Does the scan tool indicate that the SWC
Switch Voltage parameter is near the
specified value?

0 V

Go to Step 6

Go to Step 4

1. Turn OFF the ignition.

2. Disconnect the right steering wheel

controls.

3. Turn ON the ignition, with the engine

OFF.

4. With a scan tool, observe the SWC

Switch Voltage parameter.

Does the scan tool indicate that the SWC
Switch Voltage parameter is near the
specified value?

0 V

Go to Step 7

Go to Step 5

Test the remote radio control signal 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 12

Go to Step 8

Inspect for poor connections at the harness
connector of the left steering wheel control
switch. Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 9

Inspect for poor connections at the harness
connector of the right steering wheel control
switch. Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 10

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

SYMPTOMS - ENTERTAINMENT

Inspect for poor connections at the harness
connector of the body control module. Refer
to Testing for Intermittent Conditions and
Poor Connections and Connector Repairs
in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 11

Replace the left steering wheel control
switch. Refer to Steering Wheel Control
Switch Assembly Replacement in Steering
Wheel and Column.
Did you complete the replacement?

Go to Step 12

Replace the right steering wheel control
switch. Refer to Steering Wheel Control
Switch Assembly Replacement in Steering
Wheel and Column.
Did you complete the replacement?

Go to Step 12

Replace the body control module. Refer to
Body Control Module Replacement in
Body Control System.Did you complete the
replacement?

IMPORTANT:

Perform the set up procedure for the body
control module.

Go to Step 12

1. Enable the SIR system. Refer to SIR

Disabling and Enabling Zone 1 and
SIR Disabling and Enabling Zone 3
in SIR.

2. Use the scan tool in order to clear the

DTCs.

3. Operate the vehicle within the

Conditions for Running the DTC as
specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK

IMPORTANT:

1. Perform the Diagnostic System Check - Entertainment System before

using the Symptom Tables in order to verify that all of the following are
true:

There are no DTCs set.

The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the Entertainment System. Refer to
Checking Aftermarket Accessories in Wiring Systems.

Inspect for easily accessible or visible system components for obvious damage or conditions which could
cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for
Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Radio Poor Reception

Audio Distortion - One or More Speakers

Radio Displays LOC, LOCKED, or CODE

Radio Displays CLN or CLEAN

Radio Displays CAL or CAL ERR

Speed Compensated Volume

Noise Compensated Volume Inoperative

Tape Player Weak, Slow, or Garbled Output

Steering Wheel Controls Inoperative

Reduced Volume - One or More Speakers

Speakers Inoperative - One or More

Radio Audio Inoperative at Rear Seat Audio (RSA) Control

AUDIO SYSTEM TROUBLESHOOTING HINTS

Many conditions that affect radio operation may be corrected without removing the radio from the car. Verify
the condition, and follow the diagnostic procedures in order to isolate and correct the condition. In order to
properly diagnose any audio system problems, ensure that you have a fully charged battery.

Preliminary Inspections

system functions. Refer to Radio/Audio System Description and
Operation .

IMPORTANT: When testing the audio system for poor reception or noise, the vehicle

should be outside away from metal buildings and utility lines, with the
hood and rear compartment closed.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

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