Hummer H2. Manual - part 226

Fig. 2: Steering Wheel & Column Sub-System Component Views 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 2 

Callout

Component Name

1

Steering Wheel Audio Controls - Left

2

Passlock Sensor Connector

3

Ignition Key Alarm Switch

4

Ignition Lock Cylinder Control Actuator

5

Ignition Lock Cylinder Control Actuator Connector

6

Ignition Switch

7

Ignition Key Cylinder

8

Steering Wheel Audio Controls - Right

9

Horn Switch

10

Steering Wheel Driver Information (DIC) Controls - Right

11

C277

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

CRUISE CONTROL CONNECTOR END VIEWS 

Turn Signal/Multifunction Switch - Terminal Identification - C4 

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - CRUISE CONTROL 

Begin the system diagnosis with theDiagnostic System Check - Cruise Control . The Diagnostic System 
Check will provide the following information: 

z

The identification of the control modules which command the system  

z

The ability of the control modules to communicate through the serial data circuit  

z

The identification of any stored diagnostic trouble codes (DTCs) and their status  

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and 
where the procedure is located. 

DIAGNOSTIC SYSTEM CHECK - CRUISE CONTROL 

12

Steering Wheel Driver Information Center (DIC) Controls - Left

13

Turn Signal/Multifunction Switch

Connector Part Information

z

12047786  

z

4-Way M Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

BN

41

Ignition 3 Voltage

B

GY/WH

397

Cruise Control On Switch Signal

C

GY/BK

87

Cruise Control Resume/Accel Switch Signal

D

D-BU

84

Cruise Control Set/Coast Switch Signal

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

Description 

The Cruise Control Diagnostic System Check is an organized approach to identifying a condition created by an 
electronic control system failure. The Diagnostic System Check directs the service technician to the next logical 
step in diagnosing the concern. Understanding the system, the table, and using it correctly reduces diagnostic 
time and prevents misdiagnosis. For a review of the cruise control system, refer to Cruise Control Description 
and Operation . 

Test Description 

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

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

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

Diagnostic System Check - Cruise Control 

Step

Action

Yes

No

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 modules: 

z

Powertrain Control 
Module (PCM)  

z

Electronic Brake Control 
Module (EBCM)  

Does the scan tool communicate with 
the modules listed above?

Go to Step 3

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

3

1. With a scan tool, access the Class 

2 Power Mode in the Diagnostic 
Circuit Check.  

2. Rotate the ignition switch 

through all positions while 

IMPORTANT:

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

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2

  

SCAN TOOL DATA LIST 

Powertrain (PCM) 

observing the System Power 
Mode parameter.  

Does the System Power Mode 
parameter reading match the ignition 
switch position for all switch positions?

Go to Step 4

Go to Power Mode 

Mismatch in Body Control 

System

4

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

z

Powertrain Control Module 
(PCM)  

z

Electronic Brake Control Module 
(EBCM)  

 
Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms - Cruise 

Control

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 P0562, 
P0563, P0615, P1637, or P01638?

Go to Diagnostic Trouble 

Code (DTC) List in Engine 

Electrical

Go to Diagnostic Trouble 

Code (DTC) List

Scan Tool Parameter

Data List

Units Displayed

Typical Data 

Value

The Ignition is ON/Engine Idling at Normal Operating Temperature/Transmission is in 

Park/Cruise Control On/Off Switch is Off

Cruise Control Active

Cruise Control 

Data

Yes/No

No

Cruise Disengage (1 - 8) 

History

Cruise Control 

Data

Last reason for cruise control 

disengagement

Varies

Cruise On/Off Switch

Cruise Control 

Data

On/Off

Off

Cruise Release Brake Pedal 

Switch

Cruise Control 

Data

Applied/Released

Released

Cruise Resume/Accel. Switch

Cruise Control 

Data

On/Off

Off

Cruise Set/Coast Switch

Cruise Control 

Data

On/Off

Off

Engine Speed

Cruise Control 

RPM

Varies

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cruise Control - Hummer H2