Hummer H2. Manual — part 413

6. Operate the transmitter functions in order to verify correct system operation.

Method 3 - Scan Tool Required, Program All Transmitters

1. Install a scan tool.

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

3. Use the scan tool in order to access the passenger door module Special Function menu.

4. Select Program All Key Fobs to clear the PDM memory.

5. Follow the directions on the scan tool in order to program the transmitters.

6. Operate the transmitter functions in order to verify correct system operation.

DESCRIPTION AND OPERATION

KEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATION

The keyless entry system is a supplementary vehicle entry device. Radio frequencies or discharged batteries
may disable the system.

Keyless entry can operate the following components:

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The door locks

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The interior lamps

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The parking lamps

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The headlamps

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The puddle lamps (if equipped)

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The horn

The keyless entry system has the following main components:

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The transmitters

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The passenger door module (PDM)

IMPORTANT: All transmitters which are to be recognized by the PDM must be programmed in

a single programming sequence. When using this program method, all
previously programmed transmitters will be erased upon the receipt of the
programming signal from the first transmitter.
The order in which the transmitters are programmed will determine its
numbering position within the PDM memory. The first transmitter programmed
will be transmitter #1, and the second transmitter programmed will be
transmitter #2. The number stamped on the transmitter case is for reference
only; #2 can be programmed as #1, or vice versa. Additional unnumbered
transmitters are also available.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Keyless Entry - Hummer H2

The PDM communicates with the body control module (BCM) through the keyless entry serial data circuit.
When you press a button on a transmitter, the transmitter sends a signal to the PDM. The PDM sends a request
to the BCM and the BCM performs the appropriate function.

Unlock Button

Press the UNLOCK button once in order to perform the following functions:

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Unlock the driver door only.

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Illuminate interior lamps for a predetermined amount of time or until the ignition is turned to the RUN
position with a valid key.

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Illuminate the puddle lamps (if equipped) for a predetermined amount of time or until the ignition switch
is turned to the RUN position with a valid key.

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Disarm the content theft deterrent (CTD) system (if equipped).

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Deactivate the CTD system when in the Alarm Mode (if equipped).

Unlock All Doors (Second Operation)

Press the UNLOCK button a second time within 3 seconds of the first press in order to perform the following
functions:

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Unlock all doors.

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Flash the parking lamps twice.

Lock All Doors

Pressing the lock button will:

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Lock all of the doors.

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Turn the interior lamps on for 2 seconds.

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Turn the puddle lamps on (if equipped) for 2 seconds.

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Arm the content theft deterrent (CTD) system (if equipped).

Press the LOCK button again within 3 seconds of the first press in order to perform the following functions:

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Chirp the horn.

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Turn the interior lamps on for 2 seconds.

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Turn the puddle lamps on (if equipped) for 2 seconds.

Panic Alarm

IMPORTANT: On some export vehicles the panic alarm will not reset after a predetermined

amount of time. The panic alarm must be manually turned OFF using one of the
methods listed below.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Keyless Entry - Hummer H2

A single press of the transmitter panic button will:

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Pulses the horn.

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Illuminates the interior lamps.

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Flash the parking lamps.

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Flash the headlamps.

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Turn the puddle lamps on (if equipped).

All of the above will occur for a predetermined amount of time or until:

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The Panic button on the transmitter is pressed again.

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The vehicle is unlocked with the key.

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The ignition switch is turned to the RUN position with a valid key

Keyless Entry Personalization

Personalization of the remote activation verification is only available on select vehicles equipped with either a
Driver Information Center or a Secondary Information Center. For mode descriptions and programming
instructions, refer to Driver Personalization in Personalization.

Rolling Code

The keyless entry system uses rolling code technology. Rolling code technology prevents anyone from
recording the message sent from the transmitter and using the message in order to gain entry to the vehicle. The
term "rolling code" refers to the way that the keyless entry system sends and receives the signals. The
transmitter sends the signal in a different order each time. The transmitter and the PDM are synchronized to the
appropriate order. If a programmed transmitter sends a signal that is not in the order that the PDM expects, then
the transmitter is out of synchronization. This occurs after 256 presses of any transmitter button when it is out
of range of the vehicle.

Transmitter Resynchronization

Resynchronization may be necessary due to the security method used by this system. The transmitter does not
send the same signal twice to the receiver. The receiver will not respond to a signal that has been sent
previously. This prevents anyone from recording and playing back the signal from the transmitter.

To resynchronize your transmitter, stand close to your vehicle and press and hold the lock and unlock buttons
on the transmitter at the same time for 15 seconds. The door locks should cycle to confirm synchronization. If
the locks do not cycle, see your dealer for service.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Keyless Entry - Hummer H2

Illustration

Tool Number/Description

J 43241

Keyless Entry Tester

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Keyless Entry - Hummer H2