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