BODY ELECTRICAL SYSTEM 8-1

SECTION 8

BODY ELECTRICAL SYSTEM

WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System:
D Service on and around the air bag system components or wiring must be performed only by an autho-
rized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under “Gener-
al Description” in air bag system section in order to confirm whether you are performing service on
or near the air bag system components or wiring. Please observe all WARNINGS and “Service Precau-
tions” 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.
D 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).

NOTE:
For the descriptions (items) not found in this section, refer to the same section of the Service Manual men-
tioned in the FOREWORD of this manual.

CONTENTS

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Combination Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Keyless Entry System (If Equipped) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Keyless Entry System (If Equipped) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
ON-VEHICLE SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Engine Coolant Temp. (ECT) Meter and Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Keyless Entry System (If Equipped) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

8
8-2 BODY ELECTRICAL SYSTEM

GENERAL DESCRIPTION
COMBINATION METER

NOTE:
Terminal arrangement of coupler viewed from harness side.

Coupler A Coupler B Coupler C

Coupler A Coupler B Coupler C

1. To generator W/R 1. To combination switch G/R 1. Blank —

2. To ignition switch B/W 2. Blank — 2. Blank —
3. To ECM V/G 3. Blank — 3. Blank —
4. To ECM V 4. To ECM Y/G 4. Blank —
5. Blank – 5. To brake fluid level switch and R/B 5. Blank —
6. To ECT sensor Y/W parking brake switch 6. Blank —
7. Blank — 6. Blank — 7. To main fuse R
8. To engine oil pressure switch Y/B 7. To ABS control module R / Bl 8. To combination switch W / Bl
9. To ECM Br (if equipped) 9. To ground B
10. Blank — 8. Blank — 10. To combination switch G/Y
11. To SDM (if equipped) Bl 9. To fuel level gauge Y/R
12. Blank — 10. To ground B / Bl
13. Blank — 11. To ignition switch B/W
14. Blank — 12. Blank —
15. To ground R 13. Blank —
16. To combination switch R/Y
 BODY ELECTRICAL SYSTEM 8-3

KEYLESS ENTRY SYSTEM (IF EQUIPPED)

The keyless entry system uses radio wave. When the button on the transmitter is pressed, a signal is transmitted
in the form of radio wave to the receiver. Then the signal causes the door lock controller to lock and unlock the door.
The door locks can not operated with the transmitter when either of the following conditions applies.
D For 2 seconds after the ignition switch is turned from ON to OFF position.
D The ignition switch is at ON or START position.
D Any door is open.

DIAGNOSIS
KEYLESS ENTRY SYSTEM (IF EQUIPPED)
Condition Possible Cause Correction
The power door lock function D Fuse blown Replace fuse to check for short.
is available but the keyless D Code registration error Register code.
entry function is not. D Transmitter battery dead Replace battery.
D Wiring or grounding faulty Repair as necessary.
D Receiver faulty Replace.
D Transmitter faulty Replace.
Only one power door lock D Wiring or coupler faulty Repair as necessary
does not operate. D Actuator (door lock motor) faulty Replace.
Operation distance unstable. D Transmitter battery dead Replace battery.
D Transmitter faulty Replace.

NOTE:
D The operation distance of this system varies depending on the position where the transmitter is oper-
ated, at the front side, the rear side or the lateral side. The distance can be affected by radio noises from
a TV station, a power plant, a broadcasting station and so forth.

ON-VEHICLE SERVICE
TYPE 1 TYPE 2
ENGINE COOLANT TEMP. (ECT) METER AND
SENSOR
ECT SENSOR
INSPECTION
1) Warm up ECT sensor (1) observing resistance between sensor
terminal (2) and sensor unit (1). Resistance should be de-
creased with increase of its temperature.
2) Check resistance between sensor terminal (2) and sensor unit
(1). If check result is not as specified below, replace sensor.

Temperature Resistance
50_C (122_F) 136 – 216 Ω
8-4 BODY ELECTRICAL SYSTEM

KEYLESS ENTRY SYSTEM (IF EQUIPPED)

TRANSMITTER
REPLACEMENT OF THE BATTERY
If the transmitter becomes unreliable, replace the battery.
As the battery power is consumed, the operation distance will be
shorter.
1) Put the edge of a coin or a flat blade screw driver in the slot of
the transmitter and pry it open.
2) Replace the battery (lithium disc-type CR2025 or equivalent) so
its (+) terminal faces the “+” mark of the transmitter.

CAUTION:
Use care not to allow grease or dirt to be attached on the
printed circuit board and the battery.

3) Close the transmitter firmly.

4) Make sure the door locks can be operated with the transmitter.

NOTE:
D To prevent theft, be sure to break the transmitter before
discarding it.
D Dispose of the used battery properly according to appli-
cable rules or regulations. Do not dispose of lithium bat-
teries with ordinary household trash.

1. Slot

RECEIVER
INSPECTION
Using a tester, check for continuity and voltage between each termi-
nal of the connector connected to the receiver and the body ground
at the following condition.

Standard
Terminal Check for Condition
value
Unlock the driver’s seat
No continuity
1 Continuity side door by using the
! Continuity
key.
Lock the driver’s seat side No continuity
2 Continuity
door by using the key. ! Continuity
Insert the ignition key and
3 Voltage turn ON the ignition 0 V ! 10 – 14 V
switch.
1. To power door lock controller (Unlock) Open any one of all
2. To power door lock controller (Lock) 5 Voltage 10 – 14 V ! 0 V
3. To IG switch closed doors.
5. To door switch
6. To GND 6 Continuity Anytime Continuity
8. To battery
8 Voltage Anytime 10 – 14 V
 BODY ELECTRICAL SYSTEM 8-5

CODE REGISTRATION PROCEDURE

1) Start of code registration
(Initial conditions: IG switch OFF, all doors closed)
2) Open the door and then turn ON the IG switch within 10 seconds.
3) Turn OFF the IG switch within 10 seconds after it is turned ON.
4) Turn the door switch ON and OFF 3 times within 20 seconds af-
ter the IG switch is turned OFF.

5) Within 10 seconds after the door switch is turned ON, turn ON

the IG switch and then OFF within next 10 seconds.
6) After LOCK and UNLOCK operation once, the registration mode
is set.
7) Press the UNLOCK button of the transmitter once within 60 se-
conds after the registration mode is set.
8) LOCK and UNLOCK operation once again completes the regis-
tration procedure.

NOTE:
D Perform the above procedure to register a code.
D Two codes can be registered.
D When a new code is registered, the oldest one will be
cleared.
 IMMOBILIZER CONTROL SYSTEM 8G-1

SECTION 8G

IMMOBILIZER CONTROL SYSTEM

WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System:
D Service on and around the air bag system components or wiring must be performed only by an autho-
rized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under “Gener-
al Description” in air bag system section in order to confirm whether you are performing service on
or near the air bag system components or wiring. Please observe all WARNINGS and “Service Precau-
tions” 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.
D 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).

NOTE:
D Whether the immobilizer indicator lamp is used in the particular vehicle or not depends on specifica-
tions. If there is a monitor coupler in the engine room near the left strut assembly, the vehicle is not
equipped with immobilizer indicator lamp and if there isn’t, it is equipped with immobilizer indicator
lamp.
D For the descriptions (items) not found in this section, refer to the section 8G of the Service Manual men-
tioned in FOREWORD of this manual.

CONTENTS

GENERAL DESCRIPTION . . . . . . . . . . . . . . 8G- 2 A-2 Immobilizer Indicator Lamp Check

On-Board Diagnostic System (Immobilizer Indicator Lamp does not
(Self-Diagnosis Function) . . . . . . . . . . . . . 8G- 4 Light at Ignition Switch ON) . . . . . . . . . . . 8G-14
A-3 Immobilizer Indicator Lamp Check
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . 8G- 6
(Immobilizer Indicator Lamp Remains
Precautions in Diagnosing ON after Engine Starts) . . . . . . . . . . . . . . 8G-15
Troubles . . . . . . . . . . . . . . . . . . . . . . . . . . . 8G- 6
DIAGNOSTIC FLOW TABLE . . . . . . . . . . . . . 8G- 8 HOW TO REGISTER IGNITION KEY . . . . . 8G-16
Diagnostic Trouble Code Check PROCEDURE AFTER IMMOBILIZER
(Immobilizer Control Module) . . . . . . . . . 8G-10 CONTROL MODULE REPLACEMENT . . 8G-17
Diagnostic Trouble Code Check (ECM) . . 8G-10 PROCEDURE AFTER ECM
Diagnostic Trouble Code Table . . . . . . . . . 8G-12 REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . 8G-18 8G
A-1 Code (DTC) is not Outputted SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . 8G-18
from Diagnostic Output Terminal
of Immobilizer Diagnostic Coupler . . . . . 8G-13
8G-2 IMMOBILIZER CONTROL SYSTEM

GENERAL DESCRIPTION
The immobilizer control system designed to prevent vehicle burglar consists of following components.
D Engine Control Module (ECM)
D Immobilizer Control Module
D Ignition key (with built-in transponder)
D Coil antenna
Operation of this system is as follows.
(1) 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.
(2) Immobilizer Control Module compares the Transponder code read in (1) and that registered in Immobilizer Con-
trol Module and checks if they match.
(3) When it is confirmed that two Transponder codes match each other as described above, Immobilizer Control
Module and ECM check if ECM/Immobilizer Control Module codes registered in them respectively match.
(4) Only when it is confirmed that ECM/Immobilizer Control Module codes match, the engine starts running. If
Transponder codes in Step (2) or ECM/Immobilizer Control Module codes in Step (3) do not match, ECM will
stop operation of the injector and the ignitor (i.e., ignition of spark plug).

Ignition key
(2) (4)

Transponder
code (1)
Immobilizer (3)
Control
Module
ECM

1. Coil antenna
2. Immobilizer Control
Module
3. Engine Control Module
(ECM)
4. Ignition key
 IMMOBILIZER CONTROL SYSTEM 8G-3

Vehicle without monitor coupler

G13 engine
G10 engine

1. Coil antenna
2. Immobilizer Control Module
3-1. ECM (G10 engine)
3-2. ECM (G13 engine without monitor coupler)
Vehicle with monitor coupler 3-3. ECM (G13 engine with monitor coupler)
4. Immobilizer diagnostic coupler
4-1. Diagnostic output terminal
4-2. Ground terminal
5. Malfunction indicator lamp
6. Main relay
7. Ignition switch
8. Fuse
9. Main fuse
10. To #9-pin in Data link connector
11. To #7-pin in Data link connector
12. To ABS control module
13. Immobilizer indicator lamp
(Vehicle not equipped with monitor coupler)
14. Monitor coupler (Vehicle not equipped
with immobilizer indicator lamp)

WIRE COLOR
WIRE G13 engine
G13 engine
SYMBOL G10 engine with monitor
without monitor
coupler coupler
a W/R W/R W/R
b Bl / B Gr G/B
c W / Bl R/B W / Bl
n
d B/W B/W B/W
e V/G V/G –
f W / Bl W / Bl W / Bl
g B/W B/W B/W
h B B B
i V/W Y/B V/W
j V/W V/W V/W
G13B engine k P/B P/B P/B
l P / Bl P / Bl P / Bl
m P/G P/G P/G
n B B B
o B B B / Bl
p B / Bl B / Or B / Bl
q B/R B / Or B/G
r – – V
s R/G R/G –
t – – V/Y
8G-4 IMMOBILIZER CONTROL SYSTEM

ON-BOARD DIAGNOSTIC SYSTEM

(SELF-DIAGNOSIS FUNCTION)
Immobilizer Control Module & ECM diagnose troubles which may
occur in the area including the following parts when the ignition
switch is ON.

ECM: D ECM/Immobilizer Immobilizer

Control Module Control
code Module: D Transponder code
D Data link connector D Coil antenna
wire D ECM/Immobilizer
D ECM Control Module
code
D Data link
connector wire
D Immobilizer
Control Module

D Ignition signal

<Vehicle equipped with monitor coupler>

With the diagnosis switch terminal of monitor coupler for ECM not
grounded, the ignition switch turned ON (but the engine at stop) and
regardless of the condition of the engine and emission control sys-
tem, ECM indicates whether a trouble has occurred in the immobi-
lizer control system or not by causing the malfunction indicator lamp
to flash or turn ON.
Malfunction indicator lamp is ON:
No trouble exists in the immobilizer control system.
Malfunction indicator lamp is flashing:
ECM or Immobilizer Control Module has detected some trouble in
the immobilizer control system.
High
Immobilizer
Low
control system NOTE:
is normal
Ignition switch ON As soon as the ignition switch is turned ON, ECM and Immobi-
High lizer Control Module diagnose if a trouble has occurred in the
Immobilizer
Low immobilizer control system. While the diagnosis is being
control system
is abnormal 0.5 0.5 0.5 0.5
made, the malfunction indicator lamp stays ON and if the diag-
nosis result is “abnormal”, it immediately changes to flashing
TIME (sec.)
but if the result is “normal”, it remains ON. Diagnosis takes
0.5
about 3 seconds at maximum.
 IMMOBILIZER CONTROL SYSTEM 8G-5

<Vehicle not equipped with monitor coupler>

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.
High
Immobilizer
Low
control system NOTE:
is normal
Ignition switch ON As soon as the ignition switch is turned ON, ECM and Immobi-
High lizer Control Module diagnose if a trouble has occurred in the
Immobilizer
control system Low immobilizer control system. While the diagnosis is being
is abnormal 0.5 0.5 0.5 0.5 made, the Immobilizer indicator lamp stays ON and if the diag-
TIME (sec.) nosis result is “abnormal”, it immediately changes to flashing
0.5
but if the result is “normal”, it remains ON. Diagnosis takes
about 3 seconds at maximum.

When ECM and Immobilizer Control Module detects a trouble, it

stores DTC corresponding to the exact trouble area in ECM and Im-
mobilizer 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 CON-
TROL MODULE)” and “DIAGNOSTIC TROUBLE CODE CHECK
(ECM)” in this section.
8G-6 IMMOBILIZER CONTROL SYSTEM

DIAGNOSIS
ECM and Immobilizer Control Module have on-board diagnostic
system (a system self-diagnosis function) as described previously.
Investigate where the trouble is by referring to “DIAGNOSTIC
FLOW TABLE” and “DIAGNOSTIC TROUBLE CODE TABLE” on
later pages.

PRECAUTIONS IN DIAGNOSING TROUBLES

[PRECAUTIONS IN IDENTIFYING DIAGNOSTIC TROUBLE
CODE]
ECM
<Vehicle equipped with monitor coupler>
D Before identifying diagnostic trouble code indicated by malfunc-
tion indicator lamp, 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 emis-
sion control system stored in memory of ECM.
D If abnormality or malfunction lies in two or more areas, malfunc-
tion indicator lamp indicates applicable codes three times each.
And flashing of these codes is repeated as long as diagnosis ter-
minal is grounded and ignition switch is held at ON position.
D When ECM detects a trouble in both engine and emission control
system and immobilizer control system, malfunction indicator
lamp indicates trouble codes of both systems alternately while the
ignition switch is turned ON and the diagnosis terminal is
grounded.
D Take a note of diagnostic trouble code indicated first.

<Vehicle not equipped with monitor coupler>

D Before identifying diagnostic trouble code indicated through Su-
zuki 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 emis-
sion control system stored in memory of ECM.
D When ECM detects a trouble in both engine and emission control
system and immobilizer control system, Suzuki scan tool indi-
cates trouble codes of both systems using Suzuki mode of ECM
applications.
D Take a note of diagnostic trouble code indicated first.

Immobilizer Control Module

D Take a note of diagnostic trouble code indicated first.
 IMMOBILIZER CONTROL SYSTEM 8G-7

[INTERMITTENT TROUBLES]
<Vehicle equipped with monitor coupler>
D There are cases where output of diagnostic output terminal
and/or malfunction indicator lamp 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
unnecessarily. To prevent such accident, be sure to follow instruc-
tions given below when checking by using “Diagnostic 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, substitute a known-good
ECM and recheck.
* When trouble can not be identified but output of diagnostic out-
put terminal and/or malfunction indicator lamp 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 malfunction indicator lamp and/or output of diag-
nostic output terminal 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.

<Vehicle not equipped with monitor coupler>

D There are cases where output of diagnostic output terminal and/
or Suzuki scan tool indicate a diagnostic trouble code represent-
ing a trouble which occurred only temporarily and has gone. In
such case, it may occur that good parts are replaced unnecessar-
ily. To prevent such accident, be sure to follow instructions given
below when checking by using “Diagnostic 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, substitute a known-good
ECM and recheck.
* When trouble can not be identified but output of diagnostic out-
put terminal and/or 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 and/or output of diagnostic out-
put terminal 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-8 IMMOBILIZER CONTROL SYSTEM

DIAGNOSTIC FLOW TABLE

<Vehicle equipped with monitor coupler>
STEP ACTION YES NO
1 1) Make sure that diagnosis switch Go to Step 3. D If malfunction indicator lamp
terminal in monitor coupler is not remains ON, go to Step 2.
grounded by service wire. See Fig. 1. D If malfunction indicator lamp
2) Check malfunction indicator lamp remains OFF, go to
while ignition switch is ON (but without “MALFUNCTION INDICATOR
starting engine). See Fig. 2. LAMP CHECK” in Section 6.
Dose malfunction indicator lamp flash?
2 1) Using service wire, ground diagnosis Immobilizer control Go to “MALFUNCTION
switch terminal in monitor coupler. system is in good INDICATOR LAMP CHECK” in
See Fig. 3. condition. Section 6.
Dose malfunction indicator lamp flash?
3 Dose malfunction indicator lamp flash as Go to Step 4. Go to “MALFUNCTION
Fig. 4? INDICATOR LAMP CHECK” in
Section 6.
4 1) Check DTC stored in Immobilizer Go to flow table for Go to Step 5.
Control Module referring to DTC No.
“DIAGNOSTIC TROUBLE CODE
CHECK (IMMOBILIZER CONTROL
MODULE)” in this section.
Is there any DTC(s)?
5 1) Check DTC stored in ECM referring to Go to flow table for Substitute a known-good ECM
“DIAGNOSTIC TROUBLE CODE DTC No. and recheck.
CHECK (ECM)” in this section. NOTE:
Is there any DTC(s)? 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.

Fig. 1 for Step 1 Fig. 2 for Step 1 Fig. 3 for Step 2

1. Monitor coupler
2. Service wire
A: Diagnosis switch terminal
B: Ground terminal

Fig. 4 for Step 3

“CHECK ENGINE” light 0.5

ON

OFF
TIME (sec.)
 IMMOBILIZER CONTROL SYSTEM 8G-9

<Vehicle not equipped with monitor coupler>

STEP ACTION YES NO
1 1) Check immobilizer indicator lamp Go to Step 3. D If immobilizer indicator lamp
while ignition switch is ON (but without remains ON, go to Step 2.
starting engine). See Fig. 1. D If immobilizer indicator lamp
Dose immobilizer indicator lamp flash? remains OFF, go to
“IMMOBILIZER INDICATOR
LAMP CHECK” in this section.
2 1) Check DTC stored in ECM referring to Go to “IMMOBILIZER Immobilizer control system is in
“DIAGNOSTIC TROUBLE CODE INDICATOR LAMP good condition.
CHECK (ECM)” in this section. CHECK” in this section.
Is there any DTC(s)?
3 1) Check DTC stored in Immobilizer Go to flow table for Go to Step 4.
Control Module referring to DTC No.
“DIAGNOSTIC TROUBLE CODE
CHECK (IMMOBILIZER CONTROL
MODULE)” in this section.
Is there any DTC(s)?
4 1) Check DTC stored in ECM referring to Go to flow table for Substitute a known-good ECM
“DIAGNOSTIC TROUBLE CODE DTC No. and recheck.
CHECK (ECM)” in this section. NOTE:
Is there any DTC(s) for immobilizer After replacing with a known-
control system? good ECM, register ECM/
Immobilizer Control Module
code in ECM by performing
procedure described in
“Procedure after ECM
Replacement” section.

FIg. 1 for Step 1

8G-10 IMMOBILIZER CONTROL SYSTEM

DIAGNOSTIC TROUBLE CODE (DTC) CHECK

(IMMOBILIZER CONTROL MODULE)
1) Using analog type voltmeter, connect positive probe to diagnos-
tic output terminal and negative probe to ground of immobilizer
diagnostic coupler with ignition switch turned ON.
2) Read deflection of voltmeter indicator which represents DTC as
shown in example below and write it down. For details of DTC,
refer to Immobilizer Control Module side in “Diagnostic Trouble
Code Table”.
If voltmeter indicator dose not deflect, go to “Diagnostic Flow
Table A”.

NOTE:
If abnormality or malfunction lies in two or more areas, volt-
meter indicates applicable codes three times each.

1. Immobilizer diagnostic coupler

EXAMPLE :D COIL ANTENNA FAILURE (CODE NO.13)

CODE No. 13 CODE No. 13 CODE No. 13

High
Voltmeter indicator
Low
TIME (sec.)
D NORMAL (No code)
High
Voltmeter indicator
Low

TIME (sec.)

1. Monitor coupler DIAGNOSTIC TROUBLE CODE (DTC) CHECK (ECM)

2. Service wire
A: Diagnosis switch [Not using SUZUKI scan tool] (Vehicle equipped with
terminal monitor coupler)
B: Ground terminal
1) Using service wire, ground diagnostic switch terminal in monitor
coupler.
2) Read DTC from flashing pattern of malfunction indicator lamp as
shown in example below and write it down. For details of DTC,
refer to ECM side in “Diagnostic Trouble Code Table”.
If lamp remains ON, go to “Malfunction Indicator Lamp Check”
in Section 6.

NOTE:
If abnormality or malfunction lies in two or more areas, mal-
function indicator lamp indicates applicable codes three
times each.
And flashing of these codes is repeated as long as diagno-
sis terminal is grounded and ignition switch is held at ON
position.
 IMMOBILIZER CONTROL SYSTEM 8G-11

EXAMPLE: When serial data link wire is defective (Code No.83)

Malfunction
indicator lamp
Code No.83 Code No.83 Code No.83

ON

OFF

Time (sec.)

3) After completing the check, turn ignition switch OFF and discon-
nect service wire from monitor coupler.

[Using SUZUKI scan tool] (Vehicle not equipped with

monitor coupler)
1) Turn ignition switch OFF.
2) After setting cartridge to Suzuki scan tool, connect it to data link
connector (DLC) located on underside of instrument panel at
driver’s seat side.
Special Tool
(A): 09931-76011 (Suzuki scan tool)
(B): Mass storage cartridge
(C): 09931-76030 (16/14 pin DLC adapter)
3) Turn ignition switch ON.
4) Read DTC stored in ECM according to instructions displayed on
Suzuki scan tool and print it or write it down. Refer to Suzuki scan
tool operator’s manual for further details.
NOTE:
D When reading DTC stored in ECM using Suzuki scan tool,
select “ECM” from the applications menu and “SUZUKI
mode” from the communication mode menu displayed on
Suzuki scan tool.
D If ECM detects a trouble in both electric fuel injection sys-
tem and immobilizer control system, Suzuki scan tool in-
dicates trouble codes of both systems using Suzuki mode
of ECM application.
If communication between Suzuki scan tool and ECM is not pos-
sible, check if Suzuki scan tool is communicable by connecting
it to ECM in another vehicle. If communication is possible in this
case, Suzuki scan tool is in good condition. Then check data link
connector and serial data line (circuit) in the vehicle with which
communication was not possible.
1. Data link connector (DLC) 5) After completing the check, turn ignition switch OFF and discon-
nect Suzuki scan tool from data link connector (DLC).
8G-12 IMMOBILIZER CONTROL SYSTEM

DIAGNOSTIC TROUBLE CODE TABLE

Immobilizer Control Module
EXAMPLE: D COIL ANTENNA FAILURE (CODE NO.13)
CODE No. 13 CODE No. 13 CODE No. 13

High
Voltmeter Indicator
Low

EXAMPLE: D NORMAL High

Voltmeter Indicator
Low

DIAGNOSTIC TROUBLE CODE

DIAGNOSTIC AREA DIAGNOSIS
NO. VOLTMETER INDICATION
This code appears when none of the other
– Normal
codes are identified.

11
Transponder code
31

12 Immobilizer Control Module

Diagnose ttrouble
Di bl according
di tto
Coil antenna or ignition key with
13 “DIAGNOSTIC FLOW TABLE”
built-in transponder
corres onding to each code No.
corresponding No
ECM / Immobilizer Control
21
Module code

22 Ignition switch circuit

23 Serial data link wire

Engine Control module (ECM)

DTC
DTC
(indicated on Malfunction Indicator lamp
(indicated DIAGNOSTIC AREA DIAGNOSIS
Suzuki (MIL) flashing pattern
by MIL)
scan tool)
This code appears when it is
confirmed that none of other
trouble codes is set for
NO DTC 12 Normal
immobilizer control system or
engine and emission control
system.

P1623 81
ECM / Immobilizer
Control Module code Diagnose trouble according to
P1620 84
“DIAGNOSTIC FLOW TABLE”
corresponding to each code
P1622 82 ECM
No.

P1621 83 Serial data link wire

 IMMOBILIZER CONTROL SYSTEM 8G-13

A-1 CODE (DTC) IS NOT OUTPUTTED FROM DIAGNOSTIC OUTPUT TERMINAL OF

IMMOBILIZER DIAGNOSTIC COUPLER

To ECM

In cabin

1. Main fuse
A3 2. Main relay
3. Immobilizer Control Module
A5 A7
4. Immobilizer diagnostic
coupler
4-1. Diagnostic output terminal
4-2. Ground terminal

Check voltage between A3 terminal NO

“ f ” wire open.
and body ground with ignition switch
turned ON.
Is it 10 – 14 V?
D Poor A3, A5 or A7 connection.
YES D “ h ” wire of A7 terminal open.
D “ m ” wire between A5 terminal and
1. Connect voltmeter between A5 diagnostic output terminal of im-
terminal and body ground. NO mobilizer diagnostic coupler short.
2. Does voltmeter indicator deflect? If wire and connections are OK, sub-
stitute a known-good ICM and re-
YES check.
NOTE:
1. Connect voltmeter between diag- After replacing with a known-
nostic output terminal of immobi- good ICM, register ECM/ICM code
lizer diagnostic coupler and body in ECM and TP code and ECM/ICM
NO
ground. code in ICM by performing proce-
2. Is it possible to read DTC by dure described in “Procedure af-
checking deflection of voltmeter ter ICM Replacement” section.
indicator?

YES
“ m ” wire between A5 terminal and
“ n ” wire of ground terminal for im- diagnostic output terminal of immobi-
mobilizer diagnostic coupler open. lizer diagnostic coupler open.
8G-14 IMMOBILIZER CONTROL SYSTEM

A-2 IMMOBILIZER INDICATOR LAMP CHECK

(IMMOBILIZER INDICATOR LAMP DOSE NOT LIGHT AT IGNITION SWITCH ON)

For G10 engine For G13B engine

For G10 engine

1. Main fuse
2. Main relay
3. ECM
4. Immobilizer indicator lamp
(Vehicle not equipped with
monitor coupler)

For G13B engine

STEP ACTION YES NO

1 1) Turn ignition switch ON. Go to Step 2. “IG” fuse blown, main fuse blown,
Do other indicator/warning lights in ignition switch malfunction,
combination meter come ON? “(d)” circuit between “IG” fuse
and combination meter or poor
coupler connection at
combination meter.
2 1) Turn ignition switch OFF and Substitute a known- Bulb burned out or “(P)” wire
disconnect connectors from ECM. good ECM and circuit open.
2) Check for proper connection to ECM recheck.
at terminal C02-18 for G10 engine or
C01-28 for G13B engine.
3) If OK, then using service wire, ground
terminal C02-18 for G10 engine or
C01-28 for G13B engine in connector
disconnected.
Does immobilizer indicator lamp turn on
at ignition switch ON?
 IMMOBILIZER CONTROL SYSTEM 8G-15

A-3 IMMOBILIZER INDICATOR LAMP CHECK

(IMMOBILIZER INDICATOR LAMP REMAINS ON AFTER ENGINE STARTS)

For G10 engine For G13B engine

For G10 engine

1. Main fuse
2. Main relay
3. ECM
4. Immobilizer indicator lamp
(Vehicle not equipped with
monitor coupler)

For G13B engine

STEP ACTION YES NO

1 1) With ignition switch OFF, disconnect “(p)” wire shorted to Substitute a known-good ECM
couplers from ECM. ground circuit. and recheck.
Does immobilizer indicator lamp turn ON
at ignition switch ON?
8G-16 IMMOBILIZER CONTROL SYSTEM

HOW TO REGISTER IGNITION KEY

Register the ignition key with a built-in transponder in Immobilizer
Control Module by using the following procedure.
1) Prepare Suzuki scan tool (TECH 1A kit and cartridge for immobi-
lizer control system).
2) With ignition switch OFF, connect Suzuki scan tool to data link
connector (DLC) located on underside of instrument panel at
driver’s seat side.

Special Tool
(A): 09931-76011 (Tech 1A)
(B): Immobilizer cartridge
(C): 09931-76030 (16/14-pin DLC cable)

NOTE:
For operation procedure of Suzuki scan tool, refer to Suzuki
scan tool operator’s manual.

1. Data link connector (DLC)

3) Prepare ignition key with a built-in transponder. And then turn

ignition switch ON by using it.
4) Number of Transponder codes for ignition key with a built-in
transponder that can be registered in Immobilizer Control Mod-
ule is limited to 4. If needed, clear all Transponder codes for igni-
tion key with a built-in transponder that have been registered in
Immobilizer Control Module by executing the “CLR. TRANS
COD (CLEAR TP CODE)” command in the SELECT MODE
menu by using Suzuki scan tool.

1 NOTE:
When “CLR. TRANS COD (CLEAR TP CODE)” command is
executed with the malfunction indicator lamp (the lamp for
vehicles equipped with the monitor coupler) ON or the im-
mobilizer indicator lamp (the lamp for vehicles equipped
with the monitor coupler) ON, it remains ON even after
execution of that command is over. It will start flashing
when the ignition switch is turned OFF once and then
turned ON after some seconds.

5) Using Suzuki scan tool, register Transponder code in Immobiliz-

er Control Module by executing “ENT. TRANS COD (ENT. TP
CODE)” command in SELECT MODE menu.
6) [Vehicle equipped with monitor coupler]
Make sure that malfunction indicator lamp lights when ignition
switch is turned OFF once and then ON.
[Vehicle not equipped with monitor coupler]
Make sure that immobilizer indicator lamp lights when ignition
switch is turned OFF once and then ON.

1. Ignition key with built-in transponder

 IMMOBILIZER CONTROL SYSTEM 8G-17

7) If any other Transponder code for ignition key with a built-in

transponder needs to be registered, repeat above Steps 3), 5)
and 6).

NOTE:
D Up to 4 Transponder codes for ignition key with a built-in
transponder can be registered.
D It is not possible to register the same Transponder code
for ignition key with a built-in transponder as the one al-
ready registered in Immobilizer Control Module.

PROCEDURE AFTER IMMOBILIZER

CONTROL MODULE REPLACEMENT
When Immobilizer Control Module was replaced, including when
replaced because rechecking by using a known-good Immobilizer
Control Module was necessary during trouble diagnosis, register
Transponder code and ECM/Immobilizer Control Module code in
Immobilizer Control Module and ECM/Immobilizer Control Module
code in ECM by performing following procedure.
1) Perform Steps 1) and 2) described in “How to register ignition
key” section.
2) Prepare ignition key with a built-in transponder. And then turn
ignition switch ON by using it.
3) Using Suzuki scan tool, clear all transponder codes registered
in Immobilizer Control Module by executing “CLR. TRANS COD
(CLEAR TP CODE)” command in SELECT MODE menu.
NOTE:
When “CLR. TRANS COD (CLEAR TP CODE)” command is
executed with the malfunction indicator lamp (the lamp for
vehicles equipped with the monitor coupler) ON or the im-
mobilizer indicator lamp (the lamp for vehicles equipped
with the monitor coupler) ON, it remains ON even after
execution of that command is over. It will start flashing
when the ignition switch is turned OFF once and then
turned ON after some seconds.
4) Using Suzuki scan tool, register Transponder code in Immobiliz-
er Control Module by executing “ENT. TRANS COD (ENT. TP
CODE)” command in SELECT MODE menu.
5) Using Suzuki scan tool, register ECM/Immobilizer Control Mod-
ule code in both Immobilizer Control Module and ECM by
executing “RECORD ECU (RECORD ECM/PCM/ICM)” com-
mand in SELECT MODE menu.
6) [Vehicle equipped with monitor coupler]
Make sure that malfunction indicator lamp lights when ignition
switch is turned OFF once and then ON.
[Vehicle not equipped with monitor coupler]
Make sure that immobilizer indicator lamp lights when ignition
switch is turned OFF once and then ON.
7) If any other Transponder code for ignition key with a built-in trans-
ponder needs to be registered, repeat above Steps 2), 4) and 6).
NOTE:
D Up to 4 Transponder codes for ignition key with a built-in
transponder can be registered.
D It is not possible to register the same Transponder code
for ignition key with a built-in transponder as the one al-
ready registered in Immobilizer Control Module.
8G-18 IMMOBILIZER CONTROL SYSTEM

PROCEDURE AFTER ECM

REPLACEMENT
When ECM was replaced, including when replaced because re-
checking by using a known-good ECM was necessary during
trouble diagnosis, register ECM/Immobilizer Control Module code
in ECM by performing following procedure.
1) Perform Steps 1) and 2) described in “How to register ignition
key” section. And then turn ignition switch ON.
2) Using Suzuki scan tool, register ECM/Immobilizer Control Module
code in ECM by executing “RECORD ECU (RECORD ECM/Im-
mobilizer Control Module)” command in SELECT MODE menu.

NOTE:
For operation procedure of Suzuki scan tool, refer to Suzuki
scan tool operator’s manual.

3) [Vehicle equipped with monitor coupler]

Make sure that malfunction indicator lamp lights when ignition
switch is turned OFF once and then ON.
[Vehicle not equipped with monitor coupler]
Make sure that immobilizer indicator lamp lights when ignition
switch is turned OFF once and then ON.

SPECIAL TOOLS

1. Storage case
2. Operator’s manual
3. Tech 1A
4. DLC cable
(14 / 26 pin, 09931-76040)
5. Test lead / probe
6. Power source cable
7. DLC cable adapter
8. Self-test adapter
09931-76011 Immobilizer cartridge of Mass storage cartridge of
Suzuki scan tool (Tech 1A kit) version 1.1 or more version 1.5 or more

NOTE:
Use this cable only with im-
mobilizer cartridge of ver-
sion 1.1 or more.
Use of this cable with 96
immobilizer cartridge will
disable 96 immobilizer car-
tridge from operating prop-
erly.

09931-76030
16 / 14 pin DLC cable
 Prepared by

Overseas Service Department

1st Ed. July, 2000

Printed in Japan

Printing: 556