Keyless Entry System: Other Chevrolet Silverado 1500 HD

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Transmitter Synchronization

1. Resynchronization may be necessary due to the security method used by the remote keyless entry system. The transmitter does not send the same signal twice to the passenger door module (PDM).
2. The PDM will not respond to a signal that has been sent previously. This prevents anyone from recording and playing back the signal from the transmitter.
3. The panic button should still operate normally when the system is out of synchronization.
4. Resynchronization may be necessary under the following conditions: The battery in the transmitter is very weak. The battery in the transmitter was replaced. The battery in the vehicle has been in a low or no charge condition for an extended period of time.
5. In order to resynchronize the transmitter with the PDM, perform the following steps: Stand within 1.5 meters (5 ft) from the vehicle. Simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for 7 seconds. The door locks should cycle in order to confirm resynchronization.

Transmitter Programming

There are 3 methods for programming transmitters which are listed below as method 1-3. Up to four transmitters may be programmed to the passenger door module (PDM). Each programmed transmitter is given a position #1-#4 in the PDM memory.

Method 1-No Tools Required, Program All Transmitters

The order in which the transmitter 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 transmitter are also available.

1. Close all the vehicle doors.
2. Insert the ignition key into the ignition lock cylinder.
3. Press and hold the door unlock switch.
4. While holding the door lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
5. Release the door unlock switch. The doors will lock and unlock to confirm the program mode.
6. Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of approximately 15 seconds, the doors will lock and unlock to confirm the programming of that transmitter.
7. Repeat the previous step to program up to four transmitters.
8. Turn the ignition switch to the RUN position in order to exit the keyless entry transmitter programming mode.
9. Operate the transmitter functions in order to verify correct system operation.

Unlock Button

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

1. Unlock the driver door only.
2. Illuminate interior lamps for a predetermined amount of time or until the ignition is turned to the RUN position with a valid key.
3. 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.
4. Disarm the content theft deterrent (CTD) system (if equipped).
5. Deactivate the CTD system when in the Alarm Mode (if equipped).

Lock All Doors

Pressing the lock button will

1. Lock all of the doors.
2. Turn the interior lamps on for 2 seconds.
3. Turn the puddle lamps on (if equipped) for 2 seconds.
4. 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
5. Chirp the horn.
6. Turn the interior lamps on for 2 seconds.
7. Turn the puddle lamps on (if equipped) for 2 seconds.

Panic Alarm

A single press of the transmitter panic button will

1. Pulses the horn.
2. Illuminates the interior lamps.
3. Flash The parking lamps.
4. Flash the headlamps.
5. Turn the puddle lamps on (if equipped). All of the above will occur for a predetermined amount of time or until
6. The Panic button on the transmitter is pressed again.
7. The vehicle is unlocked with the key.
8. 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 .

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 transmitter sends the signal in a differentia 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 vehicle.

Scheme 11