Hummer H2. Manual — part 360

Module (SDM)

Does the scan tool communicate with
the control modules listed above?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

3

1. Access the Class 2 Power Mode

in the Diagnostic Circuit Check
on the scan tool.

2. Rotate the ignition switch

through all positions while
observing the Ignition Switch
Power Mode parameter.

Does the Ignition Switch parameter
reading match the ignition switch
position for all switch positions?

IMPORTANT:

The engine may start during the
following step. Turn the engine OFF
as soon as you have observed the
Crank Power mode.

Go to Step 4

Go to Power Mode

Mismatch in Body Control

System

4

Select the display DTCs function on
the scan tool for the following control
modules:

z

Transfer Case Electronic Control
(TREC)

z

Body Control Module (BCM)

z

Electronic Brake Control Module
(EBCM)

z

Instrument Panel Cluster (IPC)

z

Powertrain Control Module
(PCM)

z

Sensing and Diagnostic Module
(SDM)

Does the scan tool display any DTCs
for the control modules listed above?

Go to Step 5

Go to Symptoms -

Instrument Panel, Gauges

and Console

5

Does the scan tool display any DTCs
which begin with a "U"?

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

Go to Step 6

6

Does the scan tool display DTC B1000
or B1440?

Go to Diagnostic Trouble

Code (DTC) List in Body

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

DIAGNOSTIC SYSTEM CHECK - DRIVER INFORMATION SYSTEMS

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a
total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular
condition.

3: The symptom list in Symptoms will determine the correct diagnostic procedure to use.

4: The presence of DTCs which begin with "U" indicate some other module is not communicating. The
specified procedure will compile all the available information before tests are performed.

Diagnostic System Check - Driver Information Systems

Control System

Go to Step 7

7

Does the scan tool display DTC P0562,
P0563, P0615, P1637 or P1638?

Go to Diagnostic Trouble

Code (DTC) List in Engine

Electrical

Go to Diagnostic Trouble

Code (DTC) List

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Install a scan tool.
Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not

Power Up in Data Link

Communications

2

1. Turn the ignition ON, with

the engine OFF.

2. Attempt to establish

communication with the
following control modules:

z

Body Control Module
(BCM)

z

Instrument Panel
Cluster (IPC)

z

Powertrain Control
Module (PCM)

Does the scan tool communicate
with the control modules listed
above?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

Select the display DTCs function
on the scan tool for the following
control modules:

z

Body Control Module

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

DIAGNOSTIC SYSTEM CHECK - AUDIBLE WARNINGS

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a
total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular
condition.

3: The symptom list in Symptoms will determine the correct diagnostic procedure to use.

4: The presence of DTCs which begin with "U" indicate some other module is not communicating. The
specified procedure will compile all the available information before tests are performed.

Diagnostic System Check - Audible Warnings

3

(BCM)

z

Instrument Panel Cluster
(IPC)

z

Powertrain Control Module
(PCM)

Does the scan tool display any
DTCs for the control modules
listed above?

Go to Step 4

Go to Symptoms - Instrument

Panel, Gauges and Console

4

Does the scan tool display any
DTCs which begin with a "U"?

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

Go to Step 5

5

Does the scan tool display DTC
B1000 or B1440?

Go to Diagnostic Trouble

Code (DTC) List in Body

Control System

Go to Step 6

6

Does the scan tool display DTC
P0562, P0563, P0615, P1637 or
P1638?

Go to Diagnostic Trouble

Code (DTC) List in Engine

Electrical

Go to Diagnostic Trouble

Code (DTC) List

Step

Action

Yes

No

Schematic Reference: Audible Warnings Schematics

1

Install a scan tool.
Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not

Power Up in Data Link

Communications

1. Turn the ignition ON, with

the engine OFF.

2. Attempt to establish

communication with the

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

SCAN TOOL OUTPUT CONTROLS

Scan Tool Output Controls

2

following control modules:

z

Body Control Module
(BCM)

z

Instrument Panel
Cluster (IPC)

z

Powertrain Control
Module (PCM)

Does the scan tool communicate
with the control modules listed
above?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

3

Select the display DTCs function
on the scan tool for the following
control modules:

z

Body Control Module
(BCM)

z

Instrument Panel Cluster
(IPC)

z

Powertrain Control Module
(PCM)

Does the scan tool display any
DTCs for the control modules
listed above?

Go to Step 4

Go to Symptoms - Instrument

Panel, Gauges and Console

4

Does the scan tool display any
DTCs which begin with a "U"?

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

Go to Step 5

5

Does the scan tool display DTC
B1000 or B1440?

Go to Diagnostic Trouble

Code (DTC) List in Body

Control System

Go to Step 6

6

Does the scan tool display DTC
P0562, P0563, P0615, P1637 or
P1638?

Go to Diagnostic Trouble

Code (DTC) List in Engine

Electrical

Go to Diagnostic Trouble

Code (DTC) List

Scan Tool

Output

Control

Additional Menu

Selection(s)

Description

The IPC drives all gauges to the maximum physical position when

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2