Daewoo Nubira. Manual - part 1

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

N

S

m

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 – 2

I

IMMOBILIZER 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 trans-
ponder 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 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”

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 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

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 au-
thorized.

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 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.

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, 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 – 4

I

IMMOBILIZER 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.