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