Daewoo NUBIRA User 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–THEFTSYSTEM
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:
SCoding of an additional key.
SDeleting all key codes.
SDeletion of the immobilizer identification (ID) code.
SDeletion of the powertrain control module
(PCM)/engine control module (ECM) ID code.
The following functions do not require a password:
SReading an ignition key to determine if the trans-
ponder is working or if a key is authorized.
SReading 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
1Connect 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 connec-
tor DLC).
4. Turn the ignition ON, but do not start the en-
gine.
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”
2Select 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
3Read 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
4Check for an open serial data wire between the im-
mobilizer control unit and the powertrain control
module (PCM)/engine control module (ECM).
Is the circuit open?
Go to Step 5 Go to Step 6
5Repair the open serial data wire between the PCM/
ECM and the immobilizer control unit.
Is the repair complete?
System OK
61. 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:
SIGNITION 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.

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SKEY 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 au-
thorized.
SALREADY AUTHORIZED. Key coding is being at-
tempted with a key that is already authorized.
SERROR NO. 001, 002, 003. There is no commu-
nication 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.
SINVALID 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.
SNO 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, dis-
connect the detection coil and use an ohmmeter to
check for an open detection coil.
4. If the detection coil is not open, replace the immobi-
lizer 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 con-
trol 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 re-
placed.
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 repro-
gramming.
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.

9T – 6IIMMOBILIZER ANTI–THEFT SYSTEM
DAEWOO V–121 BL4
2. Slide the knee bolster trim panel upward and pull it
outward to remove it.
3. Remove the instrument panel side cover.
4. Remove the bolts and the knee bolster.
5. Remove the steering column lower cover. Refer
toSection 6E, Steering Wheel and Column.
6. Disconnect the two–pin connector from the immobi-
lizer.

IMMOBILIZER ANTI–THEFT SYSTEM 9T – 7
DAEWOO V–121 BL4
7. Pry the detection coil away from the lock cylinder. If
the detection coil will be replaced with a new one, it
does not matter if the key position trim ring is dam-
aged during removal. A new trim ring is part of the
new detection coil.
Installation Procedure
1. Install the detection coil by pressing it onto the lock
cylinder until it snaps in place.
2. Connect the two–pin connector to the immobilizer.
3. Install the steering column lower cover. Refer to
Section 6E, Steering Wheel and Column.
4. Install the knee bolster with the bolts.
Tighten
Tighten the knee bolster mounting bolts to 22 NSm (16
lb–ft)
5. Install the instrument panel side cover.
6. Install the knee bolster trim panel.

9T – 8IIMMOBILIZER ANTI–THEFT SYSTEM
DAEWOO V–121 BL4
IMMOBILIZER CONTROL UNIT
Removal Procedure
1. Disconnect the negative battery cable.
2. Carefully pull the knee bolster trim panel loose from
its retaining clips.
3. Slide the knee bolster trim panel upward and pull it
outward to remove it.
4. Remove the instrument panel side cover.
5. Remove the bolts and the knee bolster.
6. Remove the bolts and the immobilizer control unit.
7. Disconnect the electrical connectors from the im-
mobilizer control unit.

IMMOBILIZER ANTI–THEFT SYSTEM 9T – 9
DAEWOO V–121 BL4
Installation Procedure
1. Connect the electrical connectors to the immobilizer
control unit.
2. Install the immobilizer control unit with the bolts.
Tighten
Tighten the immobilizer control unit mounting bolts to
4 NSm (35 lb–in).
3. Install the knee bolster with the bolts.
Tighten
Tighten the knee bolster mounting bolts to 22 NSm (16
lb–in).
4. Install the instrument panel side cover.
5. Install the knee bolster trim panel.
6. Connect the negative battery cable.
Important :After replacing the immobilizer, the keys must
be re–authorized using the key coding procedure. Refer
to”Key Coding Procedure” in this section. Also, the elec-
tronic control module (ECM) identification (ID) code must
be reset. Refer to”ID Code Reprogramming” in this sec-
tion.