Looking for a wiring diagram or any information on how the system in my 2002 tahoe works. I guess there's the key fob, a transmitter, and relay.

 

The following information only applies as long as a GM Aftermarket Direct upgrade interface (a significant direct wired expansion for the content theft deterrent, adds more shock and touch sensing to be body) has not been installed.

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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:

• The door locks
• The interior lamps
• The parking lamps
• The headlamps
• The puddle lamps (if equipped)
• The horn

The keyless entry system has the following main components:

• The transmitters
• The remote control door lock receiver (RCDLR)

The RCDLR 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 RCDLR. The RCDLR 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:

• Unlock the driver door only.
• Turn the interior lamps on for approximately 40 seconds or until the ignition is turned to the RUN position with a valid key.
• Turn the puddle lamps on (if equipped) for approximately 40 seconds or until the ignition switch is turned to the RUN position with a valid key.
• Disarm the content theft deterrent (CTD) system (if equipped).
• 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:

• Unlock all doors.
• Flash the parking lamps twice.

Lock All Doors Pressing the lock button will:

• Lock all of the doors.
• Turn the interior lamps on for 2 seconds .
• Turn the puddle lamps on (if equipped) for 2 seconds .
• 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:

• Chirp the horn.
• Turn the interior lamps on for 2 seconds .
• Turn the puddle lamps on (if equipped) for 2 seconds .

Panic Button A single press of the horn symbol will:

• Turn the interior lamps on for 30 seconds .
• Turn the puddle lamps on (if equipped) for 30 seconds .
• Flash the parking lamps for 30 seconds .
• Flash the headlamps for 30 seconds

Pressing the horn symbol again or turning the ignition switch to the RUN position will disable the alarm mode.



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 RCDLR are synchronized to the appropriate order. If a programmed transmitter sends a signal that is not in the order that the RCDLR 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.