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Home/Buick/LeSabre/Buick LeSabre VIII (2000-2005)/Repair manual/Door Locks & Anti-Theft Systems/Keyless Entry System
Contents Wiring diagrams Section: Door Locks & Anti-Theft Systems All sections

Keyless Entry System Buick LeSabre VIII

Door Locks & Anti-Theft Systems 13 illustrations ~2259 words

Scheme 168

Scheme 168: KEYLESS ENTRY SCHEMATICS
Scheme 168: KEYLESS ENTRY SCHEMATICS

Scheme 169

Scheme 169: KEYLESS ENTRY COMPONENT VIEWS
Scheme 169: KEYLESS ENTRY COMPONENT VIEWS

Scheme 170

Scheme 170: KEYLESS ENTRY CONNECTOR END VIEWS
Scheme 170: KEYLESS ENTRY CONNECTOR END VIEWS

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. The specified procedure will determine the particular condition.
  2. 4 The symptoms list in Symptoms will determine the correct diagnostic procedure to use.
  3. 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.

Scheme 171

Scheme 171
Scheme 171

Scheme 172

Scheme 172: SCAN TOOL OUTPUT CONTROLS
Scheme 172: SCAN TOOL OUTPUT CONTROLS

SCAN TOOL DATA LIST

The Keyless Entry Scan Tool Data List contains all of the keyless entry related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The column, "Data List," indicates the location of the parameter within the scan tool menu selections. Use the Keyless Entry Scan Tool Data List as directed by a diagnostic table or in order to supplement the diagnostic procedures. Begin all of the diagnostic procedures with DIAGNOSTIC SYSTEM CHECK - REMOTE KEYLESS ENTRY .

Use the Scan Tool Data List only after the following are determined

  1. There is no published DTC procedure nor published symptom procedure for the customer concern.
  2. The DTC or symptom diagnostic procedure indicated by the diagnostic system check does not resolve the customer concern.

The Typical Data Values are obtained from a properly operating vehicle under the conditions specified in the first row of the Scan Tool Data List table. Comparison of the parameter values from the suspect vehicle with the Typical Data Values may reveal the source of the customer concern.

Scheme 173

Scheme 173
Scheme 173

SCAN TOOL DATA DEFINITIONS

  1. 8-Digit GM Part Number The scan tool displays an 8 digit number which indicates the GM part number of the module.
  2. # of Fobs Programmed The scan tool displays 1 Fob-4 Fobs to indicate the number of keyless entry transmitters that are programmed for the system.
  3. Calibration ID The scan tool displays a 4 digit number which indicates the calibration ID number of the module.
  4. Invalid Transmitter The scan tool displays More Than 10 or Less Than 10 which indicates how many times an invalid transmitter has been used in the vicinity of the vehicle.
  5. Key Fob 1 Low Voltage The scan tool displays counts which indicates the number of times a low battery voltage level was received.
  6. Key Fob 1 Battery Status The scan tool displays OK to indicate a good battery voltage level was last received.
  7. Key Fob 2 Low Voltage The scan tool displays counts which indicates the number of times a low battery voltage level was received.
  8. Key Fob 2 Battery Status The scan tool displays OK to indicate a good battery voltage level was last received.
  9. Key Fob 3 Low Voltage The scan tool displays counts which indicates the number of times a low battery voltage level was received.
  10. Key Fob 3 Battery Status The scan tool displays OK to indicate a good battery voltage level was last received.
  11. Key Fob 4 Low Voltage The scan tool displays counts which indicates the number of times a low battery voltage level was received.
  12. Key Fob 4 Battery Status The scan tool displays OK to indicate a good battery voltage level was last reachieved.
  13. Key Pressed on Fob The scan tool displays Dr. Door Unlock, Door Lock, All Door Unlock, Trunk, or Fuel Door/Alarm which indicates which keyless entry transmitter button was last pressed.
  14. Last Fob Used The scan tool displays Fob#1-Fob#4 which indicates the number of the last keyless entry transmitter used.
  15. PROM ID The scan tool displays a 4 digit number which indicates the ID number of the PROM associated with the module.

Scheme 174

Scheme 174: DIAGNOSTIC TROUBLE CODE (DTC) LIST
Scheme 174: DIAGNOSTIC TROUBLE CODE (DTC) LIST

Circuit Description

The LOW battery detection is handled inside the transmitter. The transmitter sends a battery condition signal to the Remote Control Door Lock Receiver (RCDLR) when the transmitter buttons are pressed.

Conditions For Setting The DTC

This code shall be set after 3 consecutive low battery signals from the same programmed transmitter.

Conditions For Clearing The DTC

This code is cleared as current when a normal transmitter voltage signal is received from any programmed transmitter.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 3 This step identifies the key fob # (transmitter) with a low battery signal.
  2. 4 This step verifies that the battery replacement corrected the fault.

Scheme 175

Scheme 175
Scheme 175

SYMPTOMS - KEYLESS ENTRY

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

  1. Perform «DIAGNOSTIC SYSTEM CHECK - REMOTE KEYLESS ENTRY»(/buick/lesabre/viii-2000-2005/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 modules 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 & OPERATION»(/buick/lesabre/viii-2000-2005/remont/door-locks-anti-theft-systems/#keyless-entry-system) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Keyless Entry System. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/door-locks-anti-theft-systems/#keyless-entry-system__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Inspect that the transmitter is the correct model for the vehicle. An incorrect model will not operate the keyless entry system.

Intermittent

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

Symptom List

Refer to KEYLESS ENTRY SYSTEM INOPERATIVE in order to diagnose the symptom.

CHECKING AFTERMARKET ACCESSORIES

Do not connect aftermarket accessories into the following circuits

  1. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
  2. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

  1. Power feeds connected to points other than the battery.
  2. Antenna location.
  3. Transceiver wiring located too close to vehicle electronic modules or wiring.
  4. Poor shielding or poor connectors on antenna feed line.
  5. Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

Scheme 176

Scheme 176: SECOND OPERATION INOPERATIVE WITH TRANSMITTER
Scheme 176: SECOND OPERATION INOPERATIVE WITH TRANSMITTER

Scheme 177

Scheme 177: PANIC MODE INOPERATIVE
Scheme 177: PANIC MODE INOPERATIVE

Scheme 178

Scheme 178: KEYLESS ENTRY SYSTEM INOPERATIVE
Scheme 178: KEYLESS ENTRY SYSTEM INOPERATIVE

Scheme 179

Scheme 179
Scheme 179

Removal Procedure

  1. Remove the front trim from inside of the rear storage compartment. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT-REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
  2. Disconnect the electrical connector.
  3. Depress the retainer tabs (1).
  4. Remove the remote control door lock receiver module (2).

Installation Procedure

  1. Snap the remote control door lock receiver module (2) into the slots in the rear compartment. see scheme 14
  2. Connect the electrical connector.
  3. Install the rear compartment trim. (Scheme 180) Refer to «COMPARTMENT TRIM PANEL REPLACEMENT-REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
  4. Program the remote control door lock receiver module. Refer to «TRANSMITTER PROGRAMMING»(/buick/lesabre/viii-2000-2005/remont/door-locks-anti-theft-systems/#keyless-entry-system__transmitter-programming).
  1. Replace the batteries when the range of the transmitter decreases to less than 7 m (23 ft).
  2. Insert a small coin between the two halves of the transmitter case at the slot provided near the key ring hole.
  3. Twist the coin in order to open the case.
  4. Open the transmitter case.
  5. Remove the battery (2).
  1. Install the battery (2) with the positive (+) side down. Use one 3 V CR2032 battery (or the equivalent). see scheme 16
  2. Close the transmitter case (6, 4).
  3. Ensure that the seal is in position. Align the two halves of the case and snap the two halves together.
  4. Reprogram the transmitter. Refer to «TRANSMITTER PROGRAMMING»(/buick/lesabre/viii-2000-2005/remont/door-locks-anti-theft-systems/#keyless-entry-system__transmitter-programming).

TRANSMITTER PROGRAMMING

Note. All transmitters which are to be recognized by the Remote Control Door Lock Receiver (RCDLR) must be programmed in a single programming sequence. If the system is placed in program mode, all previously programmed transmitters will be erased upon the receipt of the programming signal from the first transmitter. Up to four transmitters may be programmed. Do not operate or program the transmitters 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. The order in which the transmitters are programmed is important. The first transmitter programmed will be transmitter #1, and the second transmitter programmed will be transmitter #2. The number on the transmitters are for reference only: #2 can be programmed as #1, or vice versa. Additional unnumbered transmitters are also available. Use care to program the transmitters correctly.

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool Remote Function Actuation Special Function: Program Key Fobs in order to place the remote control door lock receiver into Program Mode. The doors will lock and then unlock in order to confirm program mode. NOTE: The scan tool must stay connected until all of the transmitters are programmed.
  4. Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of 15 seconds, the doors will lock and unlock in order to confirm the programming of that transmitter.
  5. Repeat the previous step in order to program up to 4 transmitters.
  6. Remove the scan tool.
  7. 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 allows you to operate the following components

  1. The door locks.
  2. The rear compartment lid release.
  3. The illuminated entry lamps.
  4. The panic alarm (instant alarm).

The keyless entry system has the following main components

  1. The transmitters.
  2. The Remote Control Door Lock Receiver (RCDLR).

When you press a button on a transmitter, the transmitter sends a signal to the remote control door lock receiver. The RCDLR interprets the signal and activates the requested function via a class 2 message over the serial data line.

Unlock Driver's Door Only

Momentarily press the UNLOCK button in order to perform the following functions

  1. Unlock the driver door only.
  2. Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
  3. Flash the exterior lights (if selected ON in personalization).
  4. Disarm the Content Theft Deterrent (CTD) system (if equipped).
  5. Deactivate the CTD system when in the Alarm Mode (if equipped).
  6. Recall the memory seat and the memory mirror positions for that driver.

Unlock All Doors (Second Operation)

Momentarily press the UNLOCK button a second time (within 2 seconds of the first press) in order to perform the following functions

  1. Unlock the remaining doors.
  2. Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
  3. Flash the exterior lights (if selected ON in personalization).
  4. Chirp the horn (if selected ON in personalization).
  5. Recall the memory seat and the memory mirror positions for that driver.

Lock All Doors

Press the LOCK button in order to perform the following functions

  1. Lock all of the doors.
  2. Immediately turn off the interior lamps.
  3. Flash the exterior lights (if selected ON in personalization).
  4. Chirp the horn (if selected ON in personalization).
  5. Arm the Content Theft Deterrent (CTD) system.

Rear Compartment Lid Release

If the vehicle transaxle is in PARK or NEUTRAL and the ignition is in the OFF position, a single press of the rear compartment release button will open the rear compartment lid. The interior lamps will not illuminate.

Alarm

A single press of the panic button performs the following functions

  1. Illuminates the interior lamps.
  2. Pulses the horn.
  3. Flashes the head lamps for 30 seconds or until the following conditions occur: The panic button is pressed again. The ignition switch is turned to the RUN position with a valid key. The vehicle is unlocked with the key.

Keyless Entry Personalization

The exterior lamps and horn chirp may be personalized for two separate drivers as part of the remote activation verification feature. For mode descriptions and programming instructions, refer to PERSONALIZATION DESCRIPTION & OPERATION in Doors.

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 Remote Control Door Lock Receiver (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.

Automatic Synchronization

The keyless entry transmitters do not require a manual synchronization procedure. If needed, the transmitters automatically resynchronize when any button on the transmitter is pressed within range of the vehicle. The transmitter will operate normally after the automatic synchronization.

Scheme 180

Scheme 180: SPECIAL TOOLS & EQUIPMENT
Scheme 180: SPECIAL TOOLS & EQUIPMENT

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