Keyless Entry System Cadillac Escalade GMT800

Fastener Tightening Specifications

Fastener Tightening Specifications

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Diagnostic Starting Point - Keyless Entry

Begin the system diagnosis with DIAGNOSTIC SYSTEM CHECK - REMOTE KEYLESS ENTRY . The Diagnostic System Check will provide the following information

1. The identification of the control module(s) which command the system
2. The ability of the control module(s) to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed. Any other body control module DTCs displayed by the scan tool do not apply to Remote Keyless Entry and should be diagnosed in the applicable section.

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Scan Tool Data Definitions

Fob 1 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 2 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 3 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Fob 4 Battery: The scan tool displays OK to indicate a good battery voltage level was last received.

Last Fob Button Pressed: The scan tool displays Dr. Door Unlock, All Door Unlock, Door Lock, Rear Release or Panic Alarm indicating the last input received from a programmed fob.

Last Fob Used: The scan tool displays FOB 1-4 to indicate the number of the last transmitter used

Fob 1 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 2 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 3 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Fob 4 Programmed: The scan tool displays Yes/No. The scan tool displays Yes if a transmitter is programmed to this numeric position.

Symptoms - Keyless Entry

Important: The following steps must be completed before using the symptom tables.

1. Perform «DIAGNOSTIC SYSTEM CHECK - REMOTE KEYLESS ENTRY»(/cadillac/escalade/gmt800-2001-2006/remont/door-locks-anti-theft-systems/#keyless-entry-system) before using the Symptom Tables in order to verify that all of the following are true. There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «KEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATION»(/cadillac/escalade/gmt800-2001-2006/remont/door-locks-anti-theft-systems/#keyless-entry-system) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Remote Keyless Entry System. Refer to CHECKING AFTERMARKET ACCESSORIES in Wiring Systems.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

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

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «PANIC MODE INOPERATIVE»(/cadillac/escalade/gmt800-2001-2006/remont/door-locks-anti-theft-systems/#keyless-entry-system)
2. «KEYLESS ENTRY SYSTEM INOPERATIVE»(/cadillac/escalade/gmt800-2001-2006/remont/door-locks-anti-theft-systems/#keyless-entry-system)

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The numbers below refer to the step numbers on the diagnostic table.

1. 15. This step verifies that the keyless entry serial data circuit is at B+ supplied by the BCM.
2. 16. This step tests for a short to voltage in the keyless entry serial data circuit.

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Remote Control Door Lock Receiver Replacement

The remote control door lock module is incorporated into the passenger side window switch module. Refer to SWITCH REPLACEMENT - DOOR LOCK AND SIDE WINDOW - PASSENGER in Doors.

Removal Procedure

Under normal use, the battery in the transmitter will last about 2 years. For battery replacement, use a Panasonic® 3 volt, type CR2032, or equivalent.

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1. Open the transmitter case and perform the following steps: 1.1. Insert a dime between the 2 halves of the transmitter near the key ring hole. 1.2. Twist the dime.
2. Remove the battery.

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1. Install the battery with the (+) positive side down.
2. Close the transmitter case and perform the following steps: 2.1. Align the top and bottom covers. 2.2. Press together the top and the bottom covers. 2.3. Inspect the operation of the transmitter.
3. Synchronize the transmitter. Refer to «TRANSMITTER SYNCHRONIZATION»(/cadillac/escalade/gmt800-2001-2006/remont/door-locks-anti-theft-systems/#keyless-entry-system__transmitter-synchronization) .

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

Important: Do not operate or program the transmitter in the vicinity of other vehicles that are in the keyless entry program mode. This prevents the programming of the transmitters to the incorrect vehicle.

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

Method 1 - No Tools Required, Program All Transmitters

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 to 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.

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 4 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.

Method 2 - Scan Tool Required, Program Individual Transmitter

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.

Only use this option if you are certain which transmitter, #1-#4, is being replaced, or the new transmitter can be programmed into a previously unused position within the PDM memory.

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 Individual Key Fob to program specific transmitters.
5. Follow the directions on the scan tool in order to program the transmitter or transmitters.
6. Operate the transmitter functions in order to verify correct system operation.

Method 3 - Scan Tool Required, Program All Transmitters

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.

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.

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

1. The door locks
2. The interior lamps
3. The parking lamps
4. The headlamps
5. The puddle lamps (if equipped)
6. The horn

The keyless entry system has the following main components

1. The transmitters
2. The passenger door module (PDM)

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

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).

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

1. Unlock all doors.
2. Flash the parking lamps twice.

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

1. Chirp the horn.
2. Turn the interior lamps on for 2 seconds.
3. 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.

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

1. The Panic button on the transmitter is pressed again.
2. The vehicle is unlocked with the key.
3. 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.

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See also:
• DIAGNOSTIC SYSTEM CHECK - REMOTE KEYLESS ENTRY
• TRANSMITTER SYNCHRONIZATION