2004 SUZUKI GRAND VITARA Ignition switch

YH4
GRAND
VITARA
8G-20 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
DTC21 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(IMMOBILIZER CONTROL MODULE SIDE)
DTC81 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(P1623) (ECM / PCM SIDE)
DTC84 ECM/IMMOBILIZER CONTROL MODULE CODE NOT REGISTERED
(P1620)
DESCRIPTION:

DTC21
Immobilizer Control Module checks if ECM/Immobilizer Control Module code transmitted from ECM / PCM and
that registered in Immobilizer Control Module match when ignition switch is ON. If they do not, this DTC is set.

DTC81 (P1623)
ECM / PCM checks if ECM/Immobilizer Control Module code transmitted from Immobilizer Control Module and
that registered in ECM / PCM match when ignition switch is ON. If they do not, this DTC is set.

DTC84 (P1620)
ECM / PCM checks if code transmitted from Immobilizer Control Module and that registered in ECM / PCM match
when ignition switch is ON. If there is no ECM/Immobilizer Control Module code registered in ECM / PCM, this
DTC is set.
INSPECTION:
Perform procedure described in ªProcedure after ECM / PCM Replacementº section.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-21
12
3
1. Main fuse
2. Ignition switch
3. Immobilizer
Control Module (g)
A4
DTC22 IGNITION SWITCH CIRCUIT OPEN / SHORT
DESCRIPTION:
Immobilizer Control Module monitors ignition signal when the ignition switch is ON. This DTC is set when no ignition
signal input is detected by Immobilizer Control Module.
INSPECTION:
STEPACTIONYESNO
1Check voltage between Immobilizer
Control Module coupler terminal A4
and body ground with ignition
switch turned ON.
(See Fig.1)
Is it 10 ± 14V?Poor A4 terminal connection.
If connection is OK, substitute a
known-good Immobilizer Control
Module and recheck.
NOTE:
After replacing with a know-good
Immobilizer Control Module,
register ECM/Immobilizer Control
Module code in ECM / PCM and
Transponder code and ECM/
Immobilizer Control Module code
in Immobilizer Control Module by
performing procedure described
in ªProcedure after Immobilizer
Control Module Replacementº
section.ª(g)º wire open or short.
Fig. 1 for Step 1
1
A4
1. Immobilizer Control Module

YH4
GRAND
VITARA
8G-22 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
A812
To SDM (if equipped with AIRBAG)
To data link connector (DLC)1. Immobilizer Control Module
2. ECM / PCM (j) (i)
(i)
(i)
DTC23 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
FROM ECM/PCM OR DLC CIRCUIT OPENED/SHORTED
DTC83 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
(P1621) FROM IMMOBILIZER CONTROL MODULE OR DLC CIRCUIT
OPENED/SHORTED
DESCRIPTION
When the ignition switch is ON, Immobilizer Control Module requests ECM / PCM and ECM / PCM requests Immobi-
lizer Control Module to transmit ECM/Immobilizer Control Module code. If ECM/Immobilizer Control Module code
is not transmitted from ECM / PCM or Immobilizer Control Module, Immobilizer Control Module sets DTC23 and
ECM / PCM sets DTC83 (P1621).
INSPECTION:
STEPACTIONYESNO
1Check voltage between
Immobilizer Control Mod-
ule coupler terminal A8
and body ground with igni-
tion switch turned ON.
Is it 4 ± 5V?Go to Step 2.ª(i)º or ª(j)º wire
short.
21) Disconnect ECM /
PCM coupler with igni-
tion switch turned
OFF.
2) Is there continuity be-
tween Immobilizer
Control Module cou-
pler terminal A8 and
Data link connector
terminal of ECM / PCM
coupler? (For posi-
tions of Data link con-
nector terminal of
ECM / PCM coupler,
refer to Section 6E1 or
6E2.)Poor A8 connection (Immobilizer Control Module) or
Poor Data link connector terminal connection (ECM /
PCM). If connections are OK, substitute a known-good
ECM / PCM or Immobilizer Control Module and re-
check.
NOTE :

After replacing with a known-good ECM / PCM,
register ECM/Immobilizer Control Module code
in ECM / PCM by performing procedure de-
scribed in ªProcedure after ECM / PCM Replace-
mentº section.

After replacing with a known-good Immobilizer
Control Module, register ECM/Immobilizer Control
Module code in ECM / PCM and Transponder code
and ECM/Immobilizer Control Module code in Im-
mobilizer Control Module by performing proce-
dure described in ªProcedure after Immobilizer
Control Module Replacementº section.ª(i)º or ª(j)º wire be-
tween Immobilizer
Control Module and
ECM / PCM open.
Fig. 1 for step 1
1
A8
1. Immobilizer Control Module
1. Immobilizer Control Module coupler disconnected1
A8Connect to Data link connector terminal
of ECM / PCM coupler disconnected
Fig. 2 for step 2

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-23
DTC82 (P1622) FAULT IN ECM / PCM
DESCRIPTION:
This DTC is set when an internal fault is detected in ECM / PCM.
INSPECTION:
STEPACTIONYESNO
11) Ignition switch OFF.
2) Disconnect connectors from
ECM / PCM.
3) Check for proper connection
to ECM / PCM at all terminals.
Are they in good condition?Substitute a known-good ECM / PCM and
recheck.
NOTE:
After replacing with a known-good ECM /
PCM, register ECM/Immobilizer Control
Module code in ECM / PCM by performing
procedure described in ªProcedure after
ECM / PCM Replacementº section.Repair or replace.

YH4
GRAND
VITARA
8G-24 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
1
2
3
1
2
1. Immobilizer Control Module
2. Immobilizer Control Module Coupler
3. Body ground
INSPECTION OF ECM / PCM, IMMOBILIZER
CONTROL MODULE AND ITS CIRCUIT
ECM / PCM, Immobilizer Control Module and its circuit can be
checked at ECM / PCM wiring couplers and Immobilizer Control
Module wiring coupler by measuring voltage and resistance. De-
scribed here is only inspection of Immobilizer Control Module. For
inspection of ECM / PCM, refer to ªSECTION 6E1 or 6E2º.
CAUTION:
Immobilizer Control Module cannot be checked by itself. It
is strictly prohibited to connect voltmeter or ohmmeter to
Immobilizer Control Module with coupler disconnected
from it.
Voltage Check
1) Remove Immobilizer Control Module from body with ignition
switch OFF, referring to p. 8G-24.
2) Connect Immobilizer Control Module coupler to Immobilizer
Control Module.
3) Check voltage at each terminal of coupler connected.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11 V or more when ignition switch is ON.
TERMINALCIRCUITNORMAL
VOLTAGECONDITION
A1Coil antenna 10 V
A2Coil antenna 20 VIgnition switch ON
A3Power source10 ± 14 V
A4Ignition signal10 ± 14 VIgnition switch ONA4Ignition signal0 ± 0.8 VIgnition switch OFF
A5Diagnosis output0 ± 14 VIgnition switch ONA5Diagnosis output0 VIgnition switch OFF
A6Blank±±
A7Ground±±
A8Data link connector
(Serial data terminal)4 ± 5 VIgnition switch ON
A9
A10Blank±±
NOTE:
When measuring voltage at A1 and A2 terminals with ignition switch turned ON, be sure to turn ignition
switch ON before connecting positive probe of voltmeter to A1 or A2 terminal. If it is not turned ON first,
DTC13 (Diagnostic Trouble Code 13) may be indicated.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-25
1 2
1. Immobilizer Control Module
coupler disconnected
2. Ohmmeter
Resistance Check
1) Disconnect Immobilizer Control Module couplers from Immobi-
lizer Control Module with ignition switch OFF.
CAUTION:
Never touch terminals of Immobilizer Control Module it-
self or connect voltmeter or ohmmeter.
2) Check resistance between each terminal of coupler discon-
nected.
CAUTION:

Be sure to connect ohmmeter probe from wire harness
side of coupler.

Be sure to turn OFF ignition switch for this check.

Resistance in table below represents that when parts
temperature is 20C (68F).
TERMINALCIRCUITNORMAL
RESISTANCECONDITION
A1 ± A2Coil antennaContinuity±

YH4
GRAND
VITARA
8G-26 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
ON-VEHICLE SERVICE
PRECAUTIONS IN HANDLING IMMOBILIZER
CONTROL SYSTEM

Do not turn ON ignition switch with ignition key for immobilizer
control system put together with another one or placed quite close
to another one. Or the system may detect abnormal condition and
prevent engine from starting.

Do not turn ON ignition switch by using ignition key with any type
of metal wound around its grip or in contact with it. Or the system
may detect abnormal condition and prevent engine from starting.

Do not leave ignition key where high temperature is anticipated.
High temperature will cause transponder in ignition key to be ab-
normal or damaged.

Do not turn ON ignition switch with a radio antenna placed near
coil antenna or its harness to Immobilizer Control Module. Or the
system may detect abnormal condition and prevent engine from
starting.

YH4
GRAND
VITARA
8G-28 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
1
1. Ignition key with built-in transponder 1. Data link connector (DLC)
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.
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 ªCLR. TRANS
COD (CLEAR TP CODE)º command in the SELECT MODE
menu by using Suzuki scan tool.
NOTE:
When ªCLR. TRANS COD (CLEAR TP CODE)º 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 vehicle not 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 ªENT. TRANS COD (ENT. TP
CODE)º 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.