Hummer H2. Manual - part 1157

Fig. 4: Top Of Steering Column Component Views 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 4 

ENGINE ELECTRICAL CONNECTOR END VIEWS 

Generator Terminal Identification 

Callout

Component Name

1

Ignition Switch

2

Passlock Sensor

3

Ignition Key Alarm Switch

4

Ignition Lock Cylinder Control Actuator

5

Steering Column

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

Ignition Terminal Identification Switch 

Connector Part Information

z

15355066  

z

2-Way F Metri-Pack 150 Series Sealed (TN)  

Pin

Wire Color

Circuit No.

Function

A

-

-

Plugged

B

BN

25

Charge Indicator Control Signal

C

GY

23

Generator Field Duty Cycle Signal

D

-

-

Plugged

Connector Part Information

z

10400853490  

z

7-Way F Kostal N Series (BK)  

Pin

Wire Color

Circuit No.

Function

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - ENGINE ELECTRICAL 

Begin the system diagnosis with the Diagnostic System Check - Engine Electrical . The Diagnostic System 
Check will provide the following information: 

z

The identification of the control module(s) which command the system.  

z

The ability of the control module(s) 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 - ENGINE ELECTRICAL 

Diagnostic System Check - Engine Electrical 

A

BN

4

Accessory Voltage

B

RD/WH

342

Battery Positive Voltage

C

PK

3

Ignition 1 Voltage

D

YE

5

Crank Voltage

E

WH

1390

Acc/Run/Crank Voltage

F

RD

142

Battery Positive Voltage

G

OG

300

Ignition 3 Voltage

Step

Action

Yes

No

1

Did you perform the Battery Inspection/Test?

Go to Step 2

Go to Battery 

Inspection/Test (Non-HP2)

2

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

Go to Step 4

Go to Scan Tool Does Not 

Power Up

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 OFF the engine as soon as you 
have observed the Crank power mode.

Go to Step 4

Go to Power Mode 

Mismatch in Body Control 

System

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

SCAN TOOL DATA LIST 

Powertrain Control Module (PCM) 

SCAN TOOL DATA DEFINITIONS 

4

1. Turn ON the ignition, with the engine 

OFF.  

2. Attempt to communicate with each 

module on the class 2 serial data circuit. 

If using a Tech 2, obtain this information 
using the Class 2 Message Monitor 
feature. 

Does the scan tool communicate with any 
module on the class 2 serial data circuit?

Go to Step 5

Go to Scan Tool Does Not 

Communicate with Class 2 

Device

5

1. Select the Display DTCs function for each 

module. 

If using a Tech 2, use the Class 2 DTC 
Check feature in order to determine which 
modules have DTCs set. 

2. Record all of the displayed DTCs the 

DTC status and the module which set the 
DTC.  

Does the scan tool display any DTCs?

Go to Step 6

Go to Symptoms - Engine 

Electrical

6

Does the scan tool display any DTC beginning 
with "U"?

Go to Diagnostic 

Trouble Code 

(DTC) List

Go to Step 7

7

Does the scan tool display any DTC beginning 
with "P"?

Go to Powertrain 

DTC list in Engine 

Controls

Go to Step 8

8

Does the scan tool display any DTC beginning 
with "B"?

Go to Diagnostic 

Trouble Code 

(DTC) List

Go to Diagnostic Trouble 

Code (DTC) List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Ignition 1 Signal

Engine 1,2 Data

Volts

9-14v

GEN L-Terminal Signal Command

Engine 2 Data

OK/No Output

OK

GEN F-Terminal Signal

Engine 2 Data

%

10-90%

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2