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