2008 SUZUKI SWIFT module can

Downloaded from www.Manualslib.com manuals search engine Immobilizer Control System: 10C-12
DTC P1621: Immobilizer Communication Line ErrorS7RS0BA304012
Detecting Condition and Trouble Area
DTC Confirmation Procedure1) Ignition switch turn to ON position.
2) Check DTC for ECM.
Troubleshooting 3
DTC check of BCM
Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U1073, U1100 and/or U1144 detected? Go to applicable DTC
diag. flow.
Go to Step 4.
4 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC.
Is DTC P1618 detected? Go to Step 5. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
5 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control modules for open, short and high resistance.
Is each CAN communication circuit in good condition? Go to Step 6. Repair circuit.
6 Keyless start control module power and ground circuit
check
Check for keyless start control module power and ground
circuit referring to “Keyless St art Control Module Power and
Ground Circuit Check in Section 10E”.
Are they in good condition? Substitute a known-
good keyless start
control module and
recheck.
Repair keyless start
control module power
and/or ground circuits.
Step Action Yes No
Detecting Condition
Trouble Area
Communication error between ICM and ECM is detected
by ECM. • Related fuse(s)
• Circuit between ICM and ECM
•ICM
•ECM
Step
Action YesNo
1 Was “Immobilizer Control S ystem Check” performed? Go to Step 2.Go to “Immobilizer
Control System Check”.
2 Fuse check
1) Check fuse for ICM circuit.
Is fuse in good condition? Go to Step 3.
Replace fuse and check
for short to power and
ground circuit.
3 Voltage check at ICM power and ground terminal
1) Check power and ground terminal voltage of ICM
connector referring to “Inspe ction of Immobilizer Control
Module (ICM) and Its Circuit”.
Is each terminal voltage in good condition? Go to Step 4.
Repair circuit.

Downloaded from www.Manualslib.com manuals search engine 10C-15 Immobilizer Control System:
DTC P1638: Immobilizer Information MismatchedS7RS0BA304017
DTC Detecting Condition and Trouble Area
Troubleshooting3
DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U1073, U1100, and/or U1114 detected? Go to applicable DTC
diag. flow.
Go to step 4.
4 CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition? Go to Step 5. Repair circuit.
5 Replacement of BCM
1) Replace BCM with new one referring to “BCM (Included
in Junction Block Assembly) Removal and Installation in
Section 10B”.
2) Check ECM for DTC referring to “Diagnostic Trouble Code (DTC) Check”.
Is DTC P1636 still detected? Substitute a known-
good ECM and recheck.
BCM faulty.
Step Action Yes No
Detecting Condition
Trouble Area
• The immobilizer control sys tem information in ECM and
the one in BCM does not match.
• The registration of the immobilizer control system
information in ECM is failed. • Use of the wrong ECM
• CAN communication circuits
•BCM
•ECM
Step
Action YesNo
1 Was “Immobilizer Control S ystem Check” performed? Go to Step 2.Go to “Immobilizer
Control System Check”.
2 DTC confirmation
1) Disconnect negative (–) cable from battery for more than
5 seconds.
2) Connect negative (–) cable to battery.
3) Check if any DTC is detecte d referring to “Diagnostic
Trouble Code (DTC) Check”.
Is DTC P1638 still detected? Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
3 DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC P1674, P1675, P1678 and/or P1685 detected? Go to applicable DTC
diag. flow.
Go to Step 4.
4 DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U1073, U1100, U0155 and/or U1114 detected? Go to applicable DTC
diag. flow.
Go to step 5.

Downloaded from www.Manualslib.com manuals search engine Immobilizer Control System: 10C-16
Inspection of Immobilizer Control Module (ICM) and Its CircuitS7RS0BA304018
ICM and its circuit can be checked at ICM wiring connector by measuring voltage.
CAUTION!
ICM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ICM with
connector disconnected from it.

Voltage Check
1) Remove ICM (1) from steering lock assembly or steering lock unit referrin g to “Immobilizer Control Module (ICM)
Removal and Installation”.
2) Connect ICM connector (2) to ICM.
3) Check voltage at each terminal.
NOTE
As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when the
ignition switch is turned to ON position.

5 CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition? Go to Step 6. Repair circuit.
6 Replacement of BCM
1) Replace BCM with new one referring to “BCM (Included
in Junction Block Assembly) Removal and Installation in
Section 10B”.
2) Check ECM for DTC referring to “Diagnostic Trouble Code (DTC) Check”.
Is DTC P1638 still detected? Substitute a known-
good ECM and recheck.
BCM faulty.
Step Action Yes No
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G24
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I4RS0BA30005-02
3. ICM connector (harness side view)

Downloaded from www.Manualslib.com manuals search engine Immobilizer Control System: 10C-18
Repair Instructions
Immobilizer Control Module (ICM) Removal and
Installation
S7RS0BA306001
Removal1) Disconnect negative (–) cable at battery.
2) Remove steering wheel referring to “Steering Wheel Removal and Installa tion in Section 6B”.
3) Remove steering column lower and upper covers.
4) Remove knee protector plate (1). (if equipped)
5) Remove engine start knob (2). (if equipped with keyless start system)
6) Disconnect connector (1) from ICM (2).
7) Remove a screw (3) from ICM.
8) Remove ICM from steering lock assembly or steering lock unit.
NOTE
The antenna part of ICM is fragile.
Therefore, do not add strong power to the
part or twist the part.

Installation
Reverse the removal procedure.
Registration of the Ignition KeyS7RS0BA306002
To finish the registration of the ignition key, the
transponder code memorized in the transponder built in
the ignition key has to be registered with ECM. To
register the transponder code with ECM, perform
“Register Ig Key” mode of SU ZUKI scan tool referring to
“SUZUKI Tech 2 Operator’s Manual”.
NOTE
• A maximum of four transponder codes can be registered with ECM.
• At an early part of the registration process, all transponder codes of the ignition keys
in use already registered with ECM are
cleared. Therefore, before starting the
registration, prepare all ignition keys in
use in addition to the new ignition key(s) to
be registered with ECM.

Procedure after ECM ReplacementS7RS0BA306003
After ECM is replaced with new one or used one, the
transponder code in the transponder built in the ignition
key has to be registered with ECM. To register
transponder code in the ignition key with ECM, perform
“Replace New ECM” mode of SUZUKI scan tool
referring to “SUZUKI Tech 2 Operator’s Manual”.
NOTE
A maximum of four transponder codes can
be registered with ECM.

2
1
I4RS0BA30006-03
2
3
1
I4RS0BA30007-03

Downloaded from www.Manualslib.com manuals search engine Keyless Start System: 10E-1
Control Systems
Keyless Start System
General Description
Keyless Start System DescriptionS7RS0BA501001
Keyless start system consisting of the parts shown below has three functions as described below.
• Keyless engine start function:With the remote controller which has been registered in the keyless start control module carried with oneself, the
engine can be started without using the ignition key.
• Door lock function: Pushing the request switch incorporated in the outside handl e of the driver side door, passenger side door or rear
end door while carrying the remote controller which has been registered in the keyless start control module, doors
can be locked or unlocked.
• Keyless entry system function: It is possible to lock or unlock doors by push ing the lock or unlock button of remote controller.
The keyless start control module can accept regi stration of up to four remote controllers.
5
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14
1
2
6
3
748
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11
10
I4RS0BA50001-02
1. Keyless start control module 5. Luggage room antenna 9. Steering lock unit13. Key indicator lamp
2. Remote controller 6. Driver side door antenna10. Lock button14. ECM
3. Request switch 7. Passenger side door antenna11. Unlock button
4. Center antenna 8. Rear end door antenna12. BCM

Downloaded from www.Manualslib.com manuals search engine Keyless Start System: 10E-3
Keyless Engine Start FunctionS7RS0BA501003
When the ignition knob switch (2) installed to the steering lock unit (1) is pushed, the keyless start control module (3)
activates the center antenna (4) to send out the request signa l in the vehicle compartment. When the remote controller
(5) receives the request signal from th e center antenna, it transmits the ID code to the keyless start control module.
The keyless start control module compares the ID code sent by the remote controller with the ID code registered in the
keyless start control module. When these ID codes match, the keyless start control module makes the key indicator
lamp (7) in the combination meter (6) light in blue and unlocks the steering lock unit to enable the ignition knob switch
to turn. When the ignition knob switch is turned to ON posit ion in this state, ID codes of ECM and keyless start control
module are compared through CA N communication (immobilizer function). Wh en they match, turning the ignition knob
switch to start position will start the engine.
NOTE
When ignition knob switch is at ACC or ON position (engine not running) and any door has been kept
open for a certain time, it may happen that engine fails to start. In such a case, turn ignition knob
switch to OFF position once and then try to start engine again.

When the ID code from the remote controller and the ID code registered in the keyless start control module do not
match or when the remote controller is outside the operation area of the remote controller and the ignition knob switch
is pushed, the steering lock unit cannot be unlocked and so the ignition knob switch cannot be turned. Then, the
keyless start control module makes the key indicator lamp in t he combination meter light in red to warn the driver that
it is not possible to turn the ignition knob switch. Also, when the ID code of ECM and that of the keyless start control
module do not match, the engine cannot be started even if the ignition knob switch is turned to the start position. Then
ECM makes the immobilizer light in the combination mete r flash to warn the driver that it is not possible to start the
engine.
8 3
1
6 ii)
iii) iii)
iii)
iii)
iv)
i)
v)
vi)
vii)
7 6
2
[A]: i) ~ vii)
54
I5RS0CA50001-01
[A]: Signal flow
8. ECM

Downloaded from www.Manualslib.com manuals search engine 10E-4 Keyless Start System:
Door Lock Function of Keyless Start SystemS7RS0BA501004
When the request switch (1) incorporated in the outside handle of the driver side door, front passenger side door or
rear end door is pushed, the keyless start control modul e (2) activates the center antenna (3) and luggage room
antenna (4) to send out the radio wave in the vehicle compartm ent to check if the remote controller (5) is in the vehicle
compartment or not. When the keyless start control module receives no signal from the remote controller (i.e., the
remote controller does not exist in the vehicle compartment) , it activates the antenna (6) of the door of which the
request switch has been pushed to send the request signal out of the compartment.
If the remote controller exists within the door lock operati on area, it receives the request signal sent from the above
said antenna, sends the ID code of the remote controller and the request signal to the keyless start control module and
at the same time, it makes the operatio n indicator lamp (7) of the remote controller light up. Lighting of the operation
indicator lamp indicates that the remote controller sent the ID code and the request signal.
The keyless start control module compares the ID code sent from the remote controller with the ID code registered in
the keyless start control module. If both ID codes match, the keyless start control module outputs the lock or unlock
request signal (depending on the door lock switch (8) stat e then) to BCM (9). When BCM receives such signal through
CAN communication from the keyless start control module, it activates the door lock actuator to lock or unlock doors.
When the keyless start control module receiv es a signal from the remote controller (i.e., the remote controller exists in
the vehicle compartment), the function of the keyless start system to prevent the remote controller from being closed in
the vehicle works and the keyless start control module sends a request signal to unlock doors to BCM. In this way,
doors are kept unlocked.
Also, when the driver or passenger has left the vehicl e with the remote controller left behind in the vehicle
compartment and locked doors by using the door lock knob or manual door lock switch, the function to prevent the
remote controller from being closed in the vehicle works to unlock doors.
Furthermore, when ID codes of the remote controller and keyless start control module do not match or the remote
controller exists outside of the operation area, doors are not locked or unlocked even if the request switch of the
outside handle is operated.
9 2
vi)
v)
vii) iv)
i) ii)
iii)
iii)iii)
ii)
iii)
iii)
iii)
3
5
8
6
1 4
7
[A]: i) ~ viii)
viii)
I4RS0BA50003-02
[A]: Signal flow

Downloaded from www.Manualslib.com manuals search engine Keyless Start System: 10E-5
Operation Area of Remote ControllerS7RS0BA501005
Shown below are the operation areas of the remote controller for the keyless engine start function and door lock
function of the keyless start system.
However, even when the remote controller is within the operation area as shown above, there are cases where the
keyless start system doesn’t work under certain conditi ons as described below. And when the keyless engine start
function doesn’t work, the key indicator la mp in the combination meter may light up.
• Doors cannot be locked or unlocked using the doo r lock function of keyless start system when:
– The remote controller which has been registered in the keyless start control module and another un-registered one are both carried at the same time
– The remote controller is kept in some metallic co ntainer which disturb radio wave transmission/reception
– One of doors is open
– The ignition key is inserted in the ignition key cylinder
• The function of the keyless start system to prevent the remote controller from being closed in the vehicle
compartment doesn’t work when:
– The remote controller is in the door pocket or in the glove box
– The remote controller is kept in some metallic co ntainer which disturb radio wave transmission/reception
– The remote controller is placed close to outside of the vehicle compartment (such as on the instrument panel beside the front window shield glass or in a corner of the luggage room)
• The ignition knob switch cannot be turned usin g the keyless engine start function fails to turn:
– The remote controller which has been registered in the keyless start control module and another un-registered one are both carried at the same time
– The remote controller is kept in some metallic cont ainer which disturbs radio wave transmission/reception
– The ignition knob switch has been pushed for 5 seconds or longer
– The remote controller is placed close to outside of the vehicle compartment (such as on the instrument panel beside the front window shield glass or in a corner of the luggage room)
[A] [B]
[C]
1
1
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3
3 4
2
2
I4RS0BA50004-02
[A]: Door lock function of keyless start system 1. About 80 cm (31.5 in, 2.6 ft)4. Luggage room antenna
[B]: Function of keyless start system to prevent remote controller from being closed in vehicle compartment 2. Each door antenna
5. Vehicle compartment including luggage room
[C]: Keyless engine start function 3. Center antenna6. Vehicle compartment excluding luggage room