Hummer H2. Manual — part 178

Conditions

Use this procedure after replacing:

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Passlock(tm) Sensor

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BCM

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PCM

Learn Procedures

There are two available methods to perform the programming procedure:

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A 10 minutes procedure which requires a Tech 2 and a techline terminal.

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A 30 minutes procedure which does not require the use of any tools.

10 Minute Learn Procedure

Tools Required

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Tech 2

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Techline terminal with current Service Programming System (SPS) software

1. Connect the Tech 2 to the vehicle.

2. Select "Request Information" under "Service Programming".

3. Disconnect the Tech 2 from the vehicle and connect it to a techline terminal.

4. On the techline terminal, select "Theft Module Re-Learn" under "Service Programming".

5. Disconnect the Tech 2 from the techline terminal and connect it to the vehicle.

6. Turn ON the ignition, with the engine OFF.

RPO configurations before performing learn procedures. See Body
Control Module (BCM) Programming/RPO Configuration .

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If replacing the BCM with a GM Service Parts Operations (SPO)
replacement part, the module will learn passlock(tm) sensor data code
immediately. The existing PCM however, must learn the new fuel continue
password when the BCM is replaced.

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If replacing a PCM with a GM Service Parts Operations (SPO) replacement
part, after programming, these modules will learn the incoming fuel
continue password immediately upon receipt of a password message.
Once a password message is received, and a password is learned, a learn
procedure must be performed to change this password again. A PCM
which has been previously installed in another vehicle will have learned
the other vehicle's fuel continue password and will require a learn
procedure after programming to learn the current vehicle's password.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

7. Select "VTD Re-Learn" under "Service Programming".

8. Attempt to start the engine, then release the key to ON, vehicle will not start.

9. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF, the vehicle is

now ready to relearn the Passlock(tm) Sensor Data Code and/or password on the next ignition switch
transition from OFF to CRANK.

10. Turn OFF the ignition, and wait 5 seconds.

11. Start the engine, the vehicle has now learned the password.

12. With the Tech 2 scan tool, clear any DTCs.

30 Minute Learn Procedure

1. Turn ON the ignition, with the engine OFF.

2. Attempt to start the engine, then release the key to ON, vehicle will not start.

3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.

4. Turn OFF the ignition, and wait 5 seconds.

5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes, the vehicle is now ready to

relearn the Passlock(tm) Sensor Data Code and/or passwords on the next ignition switch transition from
OFF to CRANK.

6. Start the engine. The vehicle has now learned the Passlock(tm) Sensor Data Code and/or password.

7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.

DESCRIPTION AND OPERATION

THEFT SYSTEMS DESCRIPTION AND OPERATION

Theft System Description and Operation

The theft deterrent system on this vehicle is comprised of two separate systems, the vehicle theft deterrent
(VTD) system and the content theft deterrent (CTD) system. VTD prevents drive away theft by keeping the
vehicle from starting. CTD is the vehicle alarm system which discourages unauthorized entry into the vehicle.
These system are described and diagnosed separately within this section.

SECURITY Telltale

The SECURITY Telltale on the message center is controlled by both the VTD system and the CTD system. The
SECURITY telltale is a part of the reconfigurable message center on the instrument cluster. The SECURITY
telltale is controlled by the body control module through the class 2 data line.

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The VTD system contained in the BCM commands the instrument cluster to control the SECURITY

IMPORTANT: The vehicle learns the Passlock(tm) Sensor Data Code and/or password

on the next ignition switch transition from OFF to CRANK. You must turn
the ignition OFF before attempting to start the vehicle.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

telltale only when the ignition switch is ON. The VTD system uses the telltale as a malfunction indicator.

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The CTD system also contained in the BCM commands the instrument cluster to control the indicator
only when the ignition switch is OFF. The CTD system uses the SECURITY telltale to identify system
status.

Theft Lock Radio (if applicable)

Refer to Diagnostic Starting Point - Entertainment in Entertainment.

CTD/VTD Description and Operation

Refer to the following for the appropriate description and operation:

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Content Theft Deterrent (CTD) Description and Operation

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Vehicle Theft Deterrent (VTD) Description and Operation

CONTENT THEFT DETERRENT (CTD) DESCRIPTION AND OPERATION

Content Theft Deterrent (CTD) System

The Content Theft Deterrent function provides the theft deterrent by sounding the horn and flashing the
headlamps and the park lamps when there is an unauthorized vehicle entry or there is tampering detected.

SECURITY Telltale

The SECURITY telltale on the instrument cluster is controlled by both the VTD system and the CTD system.

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The VTD system commands the instrument cluster to control the telltale only when the ignition switch is
ON. The VTD system uses the telltale as a malfunction indicator. If a DTC is present in the VTD system
when the ignition is ON, the telltale will be illuminated.

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The CTD system commands the instrument cluster to control the telltale only when the ignition switch is
OFF. The CTD system uses the telltale to identify system status.

{

Telltale FLASHING - The system is in standby mode. The system is not ready to arm (a door is
open).

{

Telltale ON STEADY - The system is in delay mode. The system is ready to arm and is executing a
time delay of 15 seconds before turning the lamp OFF and transitioning to armed mode.

{

Telltale OFF - The system may or may not be armed.

Body Control Module (BCM)

The body control module (BCM) monitors several inputs in order to arm and disarm the CTD system. The
BCM controls the alarm function outputs. When the BCM detects an unauthorized entry (any door opened), the
BCM applies ground to the horn, the park lamp and the headlamp relays. The BCM will send messages to the
security telltale in the instrument cluster through the Class 2 serial data link. The BCM has the following 8
basic modes for operating the CTD system. The more detailed descriptions are below.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2

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Off state

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Idle state

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Disarmed state

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Ready-to-arm state

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Arm initiated state

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Arm delay state

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Armed state

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Alarm state

The BCM has the following 6 discrete inputs in order to monitor the CTD system:

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Ignition 1

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Driver door latch (door jamb) switch

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Passenger door latch (door jamb) switch

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Door lock relay

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Door key switch

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Passenger door unlock relay

The BCM applies ground once per second for approximately 2 minutes, or until a valid input to disarm the
system is received by the BCM.

Door Latch (Door Jamb) Switches

The theft deterrent system uses the door key switch as one method in order to activate the alarm. If the BCM
detects any door opening before the BCM receives a disarm input, the alarm mode activates.

Door Key Switch

The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in
order to unlock the door, the switch grounds the disarm input to the BCM.

Remote Control Door Lock Receiver Module System

The remote control door lock receiver module system may also arm and disarm the CTD system. When the
remote control door lock receiver receives a door lock or an unlock signal from the key fob, the remote control
door lock receiver sends a message to the BCM. The message orders the BCM to perform the appropriate door
lock/unlock command. The BCM detects the message and performs one of the following functions:

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Locks the doors and enters the armed initiated mode

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Unlocks the doors and enters the ready-to-arm mode

Off State

The CTD system will be in the off state when the ignition switch is in the RUN position and all the doors are

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Theft Deterrent - Hummer H2