2003 Daewoo Lacetti Service & Repair Manual

SECTION : 9T IMMOBILIZER ANTI–THEFT SYSTEM CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted. TABLE OF CONTENTS SPECIFICATIONS 9T–1 . . . . . . . . . . . . . . . . . . . . . . . . . . FASTENER TIGHTENING SPECIFICATIONS 9T–1 . . . . . . . . . . . . . . . . . . . . . . . SPECIAL TOOLS 9T–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIAL TOOLS TABLE 9T–1 . . . . . . . . . . . . . . . . . . . DIAGNOSIS 9T–2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMMOBILIZERANTI–THEFT SYSTEM 9T–2 . . . . . . . DTC 53 – PCM/ECM Immobilized Error 9T–2 . . . . . . . KEY STATUS ERRORS 9T–2 . . . . . . . . . . . . . . . . . . . . COMMUNICATION BETWEEN IMMOBILIZER AND TEST EQUIPMENT 9T–3 . . . . MAINTENANCE AND REPAIR 9T–4 . . . . . . . . . . . . . . . ON–VEHICLE SERVICE 9T–4 . . . . . . . . . . . . . . . . . . . . . KEY CODING PROCEDURE 9T–4 . . . . . . . . . . . . . . . ID CODE REPROGRAMMING 9T–4 . . . . . . . . . . . . . . TRANSPONDER 9T–5 . . . . . . . . . . . . . . . . . . . . . . . . . . DETECTION COIL 9T–5 . . . . . . . . . . . . . . . . . . . . . . . . . IMMOBILIZER CONTROL UNIT 9T–8 . . . . . . . . . . . . . GENERAL DESCRIPTION AND SYSTEM OPERATION 9T–10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMMOBILIZER SYSTEM 9T–10 . . . . . . . . . . . . . . . . . . ELECTRONICALLY CODED KEYS 9T–10 . . . . . . . . . DETECTION COIL 9T–10 . . . . . . . . . . . . . . . . . . . . . . . . IMMOBILIZER CONTROL UNIT 9T–10 . . . . . . . . . . . . SERIAL DATA LINK 9T–11 . . . . . . . . . . . . . . . . . . . . . . . . POWERTRAIN CONTROL MODULE (PCM)/ENGINE CONTROL MODULE (ECM) 9T–11 . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS Application NSm Lb–Ft Lb–In Immobilizer Control Unit Mounting Bolts 4 – 35 Knee Bolster Mounting Bolts 22 16 – SPECIAL TOOLS SPECIAL TOOLS TABLE Scan Tool

9T – 2IIMMOBILIZER ANTI–THEFT SYSTEM DAEWOO V–121 BL4 DIAGNOSIS IMMOBILIZERANTI–THEFT SYSTEM The immobilizer anti–theft system requires diagnosis when it is not possible to start the engine. If the no–start condition occurs because of the immobilizer system, a diagnostic trouble code (DTC) 53 should be set. The immobilizer anti–theft system requires diagnosis when it is not possible to start the engine. If the no–start condition occurs because of the immobilizer system, a diagnostic trouble code (DTC) 53 should be set. Unauthorized use of a scan tool could be a method of de- feating the immobilizer anti–theft system. Therefore, cer- tain scan tool procedures require the use of a password. The following functions are password protected: S Coding of an additional key. S Deleting all key codes. S Deletion of the immobilizer identification (ID) code. S Deletion of the powertrain control module (PCM)/engine control module (ECM) ID code. The following functions do not require a password: S Reading an ignition key to determine if the transponder is working or if a key is authorized. S Reading the immobilizer ID code to verify that it matches the PCM/ECM ID code. DTC 53 – PCM/ECM Immobilized Error Step Action Value(s) Yes No 1 Connect the scan tool using the following procedure: 1. Insert the immobilizer data cartridge into the scan tool. 2. Turn the ignition OFF. 3. Connect the scan tool to the data link connector DLC). 4. Turn the ignition ON, but do not start the engine. Is communication established between the scan tool and the immobilizer control unit? Go to Step 2 Go to ”Commu- nication Be- tween Immobi- lizer and Test Equipment” 2 Select SYSTEM DIAGNOSIS from the scan tool menu. Does the KEY STATUS message indicate POS NR (position number) 00? Go to ’Key Status Errors” Go to Step 3 3 Read the IMMO & PCM/ECM ID–CODE message that is displayed after requesting SYSTEM DIAG- NOSIS. Does the message ID–CODE DIFFERENT appear? Go to ”ID Code Repro- gramming” Go to Step 4 4 Check for an open serial data wire between the immobilizer control unit and the powertrain control module (PCM)/engine control module (ECM). Is the circuit open? Go to Step 5 Go to Step 6 5 Repair the open serial data wire between the PCM/ ECM and the immobilizer control unit. Is the repair complete? System OK 6 1. Replace the ECM. 2. Reprogram the identification (ID) code. Refer to”ID Code Reprogramming” in this section. Is the repair complete? System OK KEY STATUS ERRORS The following KEY STATUS messages may be shown on the scan tool after commanding SYSTEM DIAGNOSIS: S IGNITION OFF STATUS. This message informs the technician that the ignition is OFF during the key coding process. Turn the ignition ON during key coding, but do not start the engine.

IMMOBILIZER ANTI–THEFT SYSTEM 9T – 3 DAEWOO V–121 BL4 S KEY IS OCCUPIED. Only five keys may be coded. If a new key is desired, the previous key codes must be deleted. Up to five keys may then be authorized. S ALREADY AUTHORIZED. Key coding is being at- tempted with a key that is already authorized. S ERROR NO. 001, 002, 003. There is no communication between the transponder in the ignition key and the detection coil. Follow the steps below to diagnose the problem: 1. Try a different key. If a different key works, the problem is in the original key. 2. If trying a different key results in the same error message, replace the detection coil. S INVALID KEY. The communication between the immobilizer control unit and the key transponder has not validated the key. Follow the steps below to diagnose the problem: 1. Code the key. Refer to”Key Coding Procedure”in this section. 2. If the same message is received after key coding, check the connection of the detection coil. 3. If the detection coil is okay, replace the immobilizer. Refer to”Immobilizer Control Unit” in this section. S NO TRANSPONDER DETECTED. The fault may be in ignition key transponder, the detection coil, or the immobilizer. Follow the steps below to diagnose the problem: 1. Try a different key. If a different key works, the problem is in the original key. 2. If trying a different key results in the same error message, check the connection of the detection coil. 3. If the connection of the detection coil is okay, disconnect the detection coil and use an ohmmeter to check for an open detection coil. 4. If the detection coil is not open, replace the immobilizer control unit. Refer to”Immobilizer Control Unit” in this section. COMMUNICATION BETWEEN IMMOBILIZER AND TEST EQUIPMENT 1. Connect the test equipment as described in theS- can Tool Equipment Manual. 2. If communication between the scan tool and the test equipment is unsuccessful, wait 30 seconds and try again. 3. If communication is not successful on the second try, turn the ignition OFF, and check the wire and the connectors between the immobilizer control unit terminal 3 and the data link connector (DLC). 4. If the wire and the connectors between the DLC and the immobilizer control unit are OK, replace the immobilizer control unit. Refer to ”Immobilizer Con- trol Unit”in this section.

9T – 4IIMMOBILIZER ANTI–THEFT SYSTEM DAEWOO V–121 BL4 MAINTENANCE AND REPAIR ON–VEHICLE SERVICE KEY CODING PROCEDURE 1. Install the immobilizer control unit cartridge in the scan tool. 2. Turn the ignition OFF 3. Connect the scan tool. 4. Turn the ignition ON with the key to be coded. 5. Enter the four–digit password that enables service personnel to use the scan tool for coding keys. 6. A lost key can be deleted only by deleting all keys and reauthorizing the remaining keys as new keys. If a key is lost, go to the next step. If no keys have been lost but an additional key is desired, go to Step 8. 7. Use the scan tool command DELETE ALL KEY CODES. 8. Use the scan tool command AUTHORIZE ONE ADDITIONAL KEY. 9. Repeat Steps 4, 5, and 6 until the immobilizer control unit has recorded all of the new keys or, after a deletion, has reauthorized all of the remaining keys. The immobilizer control unit can record a maximum of five keys. 10. Return the system to the normal mode. 11. Turn the ignition OFF. 12. Turn the ignition ON. 13. Start the engine. ID CODE REPROGRAMMING Reprogram the identification (ID) code in the following si- tuations: 1. An immobilizer control unit has been replaced. 2. An electronic control module (ECM) has been replaced. If a valid key has been lost, refer to”Key Coding Proce- dure” in this section. Reprogramming Procedure 1. Turn the ignition OFF. Reprogramming is not al- lowed while the engine is running. 2. Insert the immobilizer control unit cartridge into the scan tool. 3. Turn the ignition ON, but do not start the vehicle. 4. Enter the four–digit password that enables service personnel to use the scan tool for ID code reprogramming. 5. Use the scan tool to command RESET ID CODE.

IMMOBILIZER ANTI–THEFT SYSTEM 9T – 5 DAEWOO V–121 BL4 6. Turn the ignition OFF and ON again, but do not crank or start the engine. The powertrain control module (PCM)/engine control module (ECM) will reset the ECM ID code to match the new ID code that was calculated and sent by the immobilizer control unit when the ignition was first turned ON after the reset command. 7. Return the system to the normal mode. 8. Turn the ignition OFF. 9. Turn the ignition ON. 10. Start the engine. After reprogramming the ID code, the scan tool SYSTEM DIAGNOSIS command can verify that the PCM/ ECM ID code matches the immobilizer control unit ID code. If the reprogramming procedure does not result in match- ing ID codes, check the electrical connectors for the serial data wire between the immobilizer control unit and the PCM/ECM. TRANSPONDER If a transponder is faulty, the ignition key must be replaced. It is not possible to install a new transponder into a key. DETECTION COIL Removal Procedure 1. Carefully pull the knee bolster trim panel until it is loose from its retaining clips.

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2003 Daewoo Lacetti Service & Repair Manual

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