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