2000 SUZUKI SWIFT immobilizer

7B-24 AUTOMATIC TRANSMISSION (4 A/T)
ELECTRONIC CONTROL SYSTEM DIAGNO-
SIS
TCM has on-board diagnostic system (a system self-diagnosis
function). Investigate where the trouble is by referring to “DIAG-
NOSTIC FLOW TABLE” and “DTC TABLE” in this section.
PRECAUTIONS IN DIAGNOSING TROUBLES
[PRECAUTIONS IN IDENTIFYING DTC]
For vehicle equipped with immobilizer indicator lamp (2)
(which comes on when turning on ignition switch leaving
engine OFF), malfunction indicator lamp (MIL) (1) comes on
when TCM detects malfunction of automatic transmission
system.
For vehicle equipped without immobilizer indicator lamp (2),
malfunction indicator lamp (MIL) (1) does not come on
although TCM detects malfunction of automatic transmission
system.
Don’t disconnect couplers from TCM, battery cable from bat-
tery, TCM ground wire harness from engine or main fuse
before checking DTC stored in TCM memory.
Such disconnection will clear memorized information in TCM
memory.
Using SUZUKI scan tool (Tech-1) (4), diagnostic trouble
code (DTC) stored in TCM memory can be checked and
cleared as well.
Before its use, be sure to read Operator’s (instruction) Man-
ual supplied with it carefully to have good understanding of
its functions and usage.
Not using scan tool, the DTC stored in TCM memory also
can be checked and cleared.
DTC stored in the TCM memory is outputted by flashing of
“O/D OFF” lamp (3) with diagnosis switch terminal of monitor
connector No.2 (5) grounded.
If no DTC is stored in TCM memory, DTC No.12 is outputted
repeatedly.
If one or more DTCs are stored in TCM memory, they are
outputted starting from smallest code number in increasing
order.
After all DTCs are outputted, all DTCs are outputted repeat-
edly.
Be sure to read “PRECAUTIONS FOR ELECTRICAL CIR-
CUIT SERVICE” in Section 0A before inspection and
observe what is written there.
When replacing TCM with used one, all learned contents
which are stored in TCM memory should be erased after the
replacement referring to “LEARNING CONTROL INITIAL-
IZATION” in this section.

BODY ELECTRICAL SYSTEM 8-15
COMBINATION METER
CIRCUIT
Terminal arrangement of coupler viewed from harness side
12
3 4
56 7
8
910
1112 13
14
1715
16
or ABS
1. Speedometer 7. High beam light 13.“AIR BAG” warning light (if equipped)
2. Tachometer 8. Check engine light 14. Seat belt light (if equipped)
3. Fuel level meter 9. Oil pressure warning light 15. EPS warning light (if equipped)
4. Water temperature meter 10. Charge warning light 16.“O/D OFF” light (A/T vehicle only)
5. Turn signal pilot light (LH) 11. Brake warning light 17. Immobilizer warning light (if equipped)
6. Turn signal pilot light (RH) 12. ABS warning light (if equipped)
[A] : Connector K [B] : Connector L [C] : Connector M
1. To ignition switch BLU/YEL 1. To combination switch (turn L) GRN/RED 1. Blank–
2. To fuel level gauge YEL/RED 2. To combination switch (dimmer switch) RED 2. Blank–
3. To ECT sensor YEL/GRN 3. To VSS PPL 3. Blank–
4. To ground BLK/ORN 4. To ABS control module PNK/BLU 4. Blank–
5. Blank–5. To main fuse WHT/BLU 5. Blank–
6. To ABS control module RED/BLU 6. To door switch (driver side) BLK/YEL 6. Blank–
7. To ignition switch BLK/WHT 7. To combination switch (dimmer switch) RED/YEL 7. Blank–
8. To ECM (if equipped) BRN 8. To main fuse WHT/RED 8. Blank–
9. Blank–9. To ground BLK 9. To TCM (for A/T vehicle) BLU
10. To brake fluid level switch RED/BLK 10. To ECM (if equipped) PNK 10. Blank–
11. To parking brake switch BLK/RED 11. To ECM PPL/WHT
12. To generator WHT/BLU 12. To ground BLK
13. To oil pressure switch YEL/BLK 13. To combination switch (turn R) BLU/YEL
14. To seat belt switch BRN/YEL
15. To SDM (if equipped) YEL/BLK
16. To EPS (if equipped) YEL
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 161 2 3 4 5 6 7 8 9 10 11 12 131234 567 8910[A] [B] [C]

IMMOBILIZER CONTROL SYSTEM 8G-1
6F1
6F2
6G
6H
6K
7A
7A1
7B1
7C1
7D
7E
7F
8A
8B
8C
8D
8G
9
10
10A
10B
SECTION 8G
IMMOBILIZER CONTROL SYSTEM
CONTENTS
GENERAL DESCRIPTION ............................. 8G-2
WIRING CIRCUIT ....................................... 8G-3
ON-BOARD DIAGNOSTIC SYSTEM
(SELF-DIAGNOSIS FUNCTION) ................ 8G-4
DIAGNOSIS .................................................... 8G-5
PRECAUTIONS IN DIAGNOSING
TROUBLES ................................................. 8G-5
PRECAUTIONS IN IDENTIFYING
DIAGNOSTIC TROUBLE CODE............. 8G-5
DIAGNOSTIC FLOW TABLE ...................... 8G-6
DIAGNOSTIC TROUBLE CODE (DTC)
CHECK
(IMMOBILIZER CONTROL MODULE)........ 8G-7
DIAGNOSTIC TROUBLE CODE (DTC)
CHECK (ECM) ............................................ 8G-8
DIAGNOSTIC TROUBLE CODE TABLE .... 8G-9
TABLE A - IMMOBILIZER INDICATOR
LAMP CHECK (IMMOBILIZER INDICATOR
LAMP DOES NOT LIGHT AT IGNITION
SWITCH ON) ............................................ 8G-10
TABLE B - IMMOBILIZER INDICATOR
LAMP CHECK (IMMOBILIZER INDICATOR
LAMP REMAINS ON AFTER ENGINE
STARTS) ................................................... 8G-11
TABLE C - DTC IS NOT OUTPUT FROM
IMMOBILIZER CONTROL MODULE ........ 8G-12
DTC11/32 TRANSPONDER CODE NOT
MATCHED ................................................ 8G-13
DTC31 TRANSPONDER CODE NOT
REGISTERED ........................................... 8G-14
DTC12 FAULT IN IMMOBILIZER
CONTROL MODULE ................................ 8G-14DTC13 NO TRANSPONDER CODE
TRANSMITTED OR COIL ANTENNA
OPENED/SHORTED ................................. 8G-15
DTC21 ECM/IMMOBILIZER CONTROL
MODULE CODE NOT MATCHED
(IMMOBILIZER CONTROL MODULE
SIDE) ......................................................... 8G-16
DTC P1623 ECM/IMMOBILIZER CONTROL
MODULE CODE NOT MATCHED (ECM
SIDE) ......................................................... 8G-16
DTC P1620 ECM/IMMOBILIZER CONTROL
MODULE CODE NOT REGISTERED ....... 8G-16
DTC P1622 FAULT IN ECM ...................... 8G-16
DTC22 IGNITION SWITCH CIRCUIT
OPEN/SHORT ........................................... 8G-17
DTC23 NO ECM/IMMOBILIZER CONTROL
MODULE CODE TRANSMITTED FROM
ECM OR DLC CIRCUIT OPENED/
SHORTED ................................................. 8G-18
DTC P1621 NO ECM/IMMOBILIZER
CONTROL MODULE CODE TRANSMITTED
FROM IMMOBILIZER CONTROL
MODULE OR DLC CIRCUIT OPENED/
SHORTED ................................................. 8G-18
INSPECTION OF ECM, IMMOBILIZER
CONTROL MODULE AND ITS CIRCUIT .. 8G-20
ON-VEHICLE SERVICE ................................ 8G-21
PRECAUTIONS IN HANDLING
IMMOBILIZER CONTROL SYSTEM ......... 8G-21
IMMOBILIZER CONTROL MODULE ......... 8G-22
HOW TO REGISTER IGNITION KEY ........... 8G-23 WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System
Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).

8G-2 IMMOBILIZER CONTROL SYSTEM
PROCEDURE AFTER IMMOBILIZER CONTROL
MODULE REPLACEMENT ........................... 8G-24
PROCEDURE AFTER ECM
REPLACEMENT............................................ 8G-25SPECIAL TOOL ............................................ 8G-25

GENERAL DESCRIPTION
The immobilizer control system designed to prevent vehicle burglar consists of following components.
Engine control module (ECM)
Immobilizer control module (1) with coil antenna
Ignition key (2) with built-in transponder
Operation of this system is as follows.
i) Each ignition key has its own code (Transponder code) stored in memory. When the ignition switch is
turned ON, Immobilizer Control Module tries to read the Transponder code through the coil antenna
installed to the steering lock assembly.
ii) Immobilizer Control Module compares the Transponder code read in Step (i) and that registered in Immo-
bilizer Control Module and checks if they match.
iii) When it is confirmed that two Transponder codes match each other as described above, Immobilizer Con-
trol Module and ECM check if ECM/Immobilizer Control Module codes registered in them respectively
match.
iv) Only when it is confirmed that ECM/Immobilizer Control Module codes match, the engine starts running. If
Transponder codes in Step (ii) or ECM/Immobilizer Control Module codes in Step (iii) do not match, ECM
will stop operation of the injector and ignition of spark plug.
3. Data link connector (DLC)
4. Immobilizer indicator lamp
5. ECM

IMMOBILIZER CONTROL SYSTEM 8G-3
WIRING CIRCUIT
1. Immobilizer Control Module 4. Ignition switch 7. Data link connector
2. ECM 5. Fuse 8. To ABS control module, SDM and TCM
3. Main relay 6. Main fuse 9. Immobilizer indicator lamp
BRN/WHT
BLK/RED
BLK/WHT
PNK
BLK/RED
BLK/WHT
BLK
BLK
BLK/ORG
BLK/ORG
BLU
YEL
YEL
BLK/YEL
6
G02-7 G02-5
C42-2
C42-1
C42-3 C41-10
C41-5/6
G02-6
G02-12
G06-4
G06-3
G06-1G06-2
3
45 5
2
8
97
1
BB
BB

8G-4 IMMOBILIZER CONTROL SYSTEM
ON-BOARD DIAGNOSTIC SYSTEM
(SELF-DIAGNOSIS FUNCTION)
Immobilizer Control Module and ECM diagnose troubles which
may occur in the area including the following parts when the igni-
tion switch is ON.
ECM :
ECM/Immobilizer Control Module code
Serial data link circuit
ECM
Immobilizer Control Module :
Transponder code
Coil antenna
ECM/Immobilizer Control Module code
Serial data link circuit
Immobilizer Control Module
Ignition signal
With the ignition switch turned ON (but the engine at stop) regard-
less of the condition of the engine and emission control system,
ECM indicates whether a trouble has occurred in the immobilizer
control system or not by causing the immobilizer indicator lamp to
flash or turn ON.
Immobilizer indicator lamp is ON :
No trouble exists in the immobilizer control system.
Immobilizer indicator lamp is flashing :
ECM or Immobilizer Control Module has detected some trouble in
the immobilizer control system.
When ECM and Immobilizer Control Module detects a trouble, it
stores DTC corresponding to the exact trouble area in ECM and
Immobilizer Control Module memory.
DTCs stored in memory of each controller (Immobilizer Control
Module and ECM) can be read by using the procedure described
in “DIAGNOSTIC TROUBLE CODE CHECK (IMMOBILIZER
CONTROL MODULE)” and “DIAGNOSTIC TROUBLE CODE
CHECK(ECM)” in this section. NOTE:
As soon as the ignition switch is turned ON, ECM and
Immobilizer Control Module diagnose if a trouble has
occurred in the immobilizer control system. While the
diagnosis is being made, the immobilizer indicator lamp
stays ON and if the diagnosis result is “abnormal”, it
immediately changes to flashing but if the result is “nor-
mal”, it remains ON. Diagnosis takes about 3 seconds at
maximum.

IMMOBILIZER CONTROL SYSTEM 8G-5
DIAGNOSIS
PRECAUTIONS IN DIAGNOSING TROUBLES
PRECAUTIONS IN IDENTIFYING DIAGNOSTIC TROUBLE CODE
ECM
Before identifying diagnostic trouble code indicated through Suzuki scan tool, don't disconnect couplers from
ECM, battery cable from battery, ECM ground wire harness from engine.
Such disconnection will clear trouble codes for engine and emission control system and immobilizer control
system stored in memory of ECM.
Take a note of diagnostic trouble code indicated first.
IMMOBILIZER CONTROL MODULE
Take a note of diagnostic trouble code indicated first.
INTERMITTENT TROUBLES
There is case where Suzuki scan tool indicate a diagnostic trouble code representing a trouble which
occurred only temporarily and has gone. In such case, it may occur that good parts are replaced unneces-
sarily. To prevent such accident, be sure to follow instructions given below when checking by using “Diag-
nostic Flow Table”.
–When trouble can be identified, it is not an intermittent one :
Check coil antenna, ignition key, wires and each connection and if they are all in good condition, substi-
tute a known-good ECM and recheck.
–When trouble can not be identified but Suzuki scan tool indicate a trouble code :
Diagnose trouble by using that code No. and if ignition key, coil antenna, wires and each connection are
all in good condition, turn OFF ignition switch and then ON.
Then check what Suzuki scan tool indicate.Only when they indicate trouble code again, substitute a known-
good ECM or Immobilizer Control Module and check again.
If they indicate not trouble code but normal code, it means that an intermittent trouble did occur and has gone. In
this case, check wires and connections carefully again.

8G-6 IMMOBILIZER CONTROL SYSTEM
DIAGNOSTIC FLOW TABLE
Fig. 1 for Step 1Step Action Yes No
1 1) Check immobilizer indicator lamp while igni-
tion switch is ON (but without starting
engine). See Fig. 1.
Does immobilizer indicator lamp flash?Go to Step 3. If immobilizer indicator lamp
remains ON, go to Step 2.
If immobilizer indicator lamp
remains OFF, go to “TABLE
A IMMOBILIZER INDICA-
TOR LAMP CHECK” in this
section.
2 1) Check DTC stored in ECM referring to
“DIAGNOSTIC TROUBLE CODE CHECK
(ECM)” in this section.
Is there any DTC(s)?Go to “TABLE B
IMMOBILIZER INDI-
CATOR LAMP
CHECK” in this sec-
tion.Immobilizer control system is
in good condition.
3 1) Check DTC stored in immobilizer control
module referring to “DIAGNOSTIC TROU-
BLE CODE CHECK (IMMOBILIZER CON-
TROL MODULE)” in this section.
Is there any DTC(s)?Go to flow table for
DTC No.Go to Step 4.
4 1) Check DTC stored in ECM referring to
“DIAGNOSTIC TROUBLE CODE CHECK
(ECM)” in this section.
Is there any DTC(s) for immobilizer control sys-
tem?Go to flow table for
DTC No.Substitute a known-good
ECM and recheck.
See NOTE below.
NOTE:
After replacing with a known-good ECM, register ECM/Immobilizer Control Module code in ECM by
performing procedure described in “Procedure after ECM Replacement” section.