Hummer H2. Manual — part 168

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.

5: Tests for an open in the passlock sensor signal circuit which may not set a DTC B2958 under certain
conditions.

6: 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.

7: The presence of DTC P0601, P0602, P0604, or P0606 indicates an internal fault in the PCM.

8: The presence of DTC B1000 indicates an internal module fault.

9: The Presence of DTC P1637, P1638, P0562 or P0563 indicates a low or high voltage condition.

Diagnostic System Check - Theft Deterrent

Step

Action

Yes

No

Schematic Reference:Theft Deterrent System 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 ON the ignition, with the

engine OFF.

2. Attempt to establish

communication with the following
control modules:

z

Powertrain Control Module
(PCM)

z

Body Control Module
(BCM)

z

Instrument Panel Cluster
(IPC)

Does the scan tool communicate with
the all the listed control modules?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

1. Access the Class 2 Power Mode

parameter in the Diagnostic
Circuit Check menu on the scan

IMPORTANT:

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

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

3

tool.

2. Rotate the ignition switch through

all positions while observing the
Class 2 Power Mode parameter.

Does the Class 2 Power Mode parameter
reading match the ignition switch
position for all switch positions?

IMPORTANT:

Insure that all ignition switch
positions are observed
including the OFF position.

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

Powertrain Control Module
(PCM)

z

Body Control Module (BCM)

z

Instrument Panel Cluster (IPC)

Does the scan tool display any DTCs?

Go to Step 6

Go to Step 5

5

1. Momentarily rotate the ignition

switch to CRANK. Do not start
the vehicle.

2. Release the ignition switch to ON.

3. With a scan tool, observe the

Passlock Code in the Body
Control Module Security Data list.

Does the scan tool display OPEN?

Go to DTC B2958

Go to Symptoms - Theft

Deterrent

6

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 7

7

Does the scan tool display DTC P0601,
P0602, P0604, or P0606?

Go to Diagnostic Trouble

Code (DTC) List in Engine

Controls - 6.0L

Go to Step 8

8

Does the scan tool display DTC B1000? Go to DTC B1000 in Body

Control System

Go to Step 9

Does the scan tool display DTC P1637,

Go to Diagnostic Trouble

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

SCAN TOOL DATA LIST

Body Control Module (BCM)

9

P1638, P0562 or P0563?

Code (DTC) List in Engine

Electrical

Go to Diagnostic Trouble

Code (DTC) List

Scan Tool

Parameter

Data List

Units Displayed

Typical

Data Value

Ignition ON/Engine OFF/Vehicle in PARK/Headlamps in AUTO

Auto Learn
Timer

Security

Data

Seconds

0-600

Battery
Voltage

Data

Volts

Varies

Content Theft
Lamp

Security

Data

ON/OFF

OFF

Content Theft
State

Security

Data

ON/OFF

OFF

Door Unlock
Switch

Inputs

ACTIVE/INACTIVE

ACTIVE

Driver Door
Ajar Switch

Inputs

ACTIVE/INACTIVE

ACTIVE

(door open)

Ignition 1

Inputs

ACTIVE/INACTIVE

ACTIVE

Ignition 3

Inputs

ACTIVE/INACTIVE

ACTIVE

Module Part
Number

ID

Information

Numeric

Varies

Passlock Code

Security

Data

Open/Short/Tamper/Numeric

Valid Code

1-10

Passlock Data
Voltage

Security

Data

Volts

0.86-5

Volts

Passlock
Ignition Cycles

Security

Data

Cycles

Varies

Passlock
Power

Security

Data

On/Off

On

Passlock State

Security

Data

Ignition Off/Tamper/Fail Enable/Fail Enable Dec/Seedkey

Lrn Pend/Seedkey Learn/Auto Learn Pend/Learn

Passlock/Monitor Passlock/Normal Decision/Auto Learn

Monitor

Passlock

Security
Calibration
Number

ID

Information

Numeric

Varies

Security Lamp
State

Security

Data

ON/OFF/FLASHING

OFF

Security Suffix

ID

Information

Two Letters

Varies

Seed and Key

Security

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

Powertrain Control Module (PCM)

SCAN TOOL DATA DEFINITIONS

Auto Learn Timer

The scan tool displays the seconds used by the BCM to learn valid code from the Passlock(tm) sensor.
The learn procedure consists of 3 consecutive periods.

Battery Voltage

The scan tool displays the battery system voltage.

Content Theft Lamp

The scan tool displays the state of the SECURITY lamp. The scan tool displays ON when activated by an
unauthorized entry.

Content Theft State

The scan tool displays the state of the content theft feature. The scan tool displays ON when activated by
an unauthorized entry.

Door Unlock Switch

The scan tool displays the state of the door key switch. The scan tool displays ACTIVE when the switch
is activated in either door key cylinder.

Drivers Door Ajar Switch

The scan tool displays the position of the drivers door. The scan tool displays ACTIVE when the drivers
door is open.

Ignition 1

Timer

Data

Seconds

0 Seconds

Tamper Timer

Security

Data

Seconds

0-600

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Vehicle in PARK/Headlamps in AUto

PCM/VCM in VTD Fail Enable

Engine Data 1

Yes/No

No

VTD Auto Learn Timer

Engine Data 1

Active/Inactive

Inactive

VTD Fuel Disable

Engine Data 1

Active/Inactive

Inactive

VTD Fuel Disable Until Ign. OFF

Engine Data 1

Yes/No

No

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2