2006 SUZUKI SX4 Can line

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DTC CheckS6RW0DA204005
Using SUZUKI Scan Tool
1) Prepare SUZUKI scan tool.
2) With ignition switch turned OFF, connect it to data link connector (DLC) located on underside of instrument panel
of driver’s side.
Special tool
(A): SUZUKI scan tool
3) Turn ignition switch ON.
4) Read DTC 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.
If communication between SUZUKI scan tool and BCM is not possible, check if SUZUKI scan tool is
communicable by connecting it to BCM 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.
5) After completing the check, turn ignition switch off and disconnect SUZUKI scan tool from data link connector.
Without Using SUZUKI Scan Tool
1) Turn ignition switch to OFF position.
2) Perform following Steps a) to d) within 10 seconds after ignition switch is turned ON and engine stops.
a) Turn headlight switch to “SMALL” position.
b) Turn headlight switch to “OFF” position.
c) Repeat Steps a) and b) 2 times.
d) Press and release driver side door switch 3 times.
(A)
I5RW0AA20008-02

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BCM connector “E04”L01-10Driver side door lock
actuator control (Unlock) (if
equipped)10 – 14 VUnlock signal is output for driver side door
lock actuator
0 VUnlock signal is not output for driver side
door lock actuator
L01-11Rear end door opener
actuator control (if equipped)0 VRear end door actuator motor is not in
operation
10 – 14 V Rear end door actuator motor is in operation
L01-12Manual door lock switch
(Lock) (if equipped)10 – 14 VManual door lock switch is at any position
other than lock position
0 V Manual door lock switch is at lock position
L01-13 — — —
L01-14 Driver side seat belt switch*0 – 3 V
↑↓
10 – 14 VRefer to “Reference waveform No. 2: ”
0 VIgnition switch is at ON position and driver
side seat belt is unfastened
L01-15Door switch (other than
driver side door and rear end
door)10 – 14 VRear right and left side door and passenger
side door are closed
0 VAny one of the door is opened (except driver
side door and rear end door)
L01-16Driver side door key cylinder
switch (Lock) (if equipped)10 – 14 VDriver side door key cylinder switch is at any
position other than lock position
0 VDriver side door key cylinder switch is at lock
position
L01-17Driver side door key cylinder
switch (Unlock) (if equipped)10 – 14 VDriver side door key cylinder switch is at any
position other than unlock position
0 VDriver side door key cylinder switch is at
unlock position
L01-18 — — —
Terminal Circuit Normal voltage Condition
E04-1CAN communication line (high)
for ABS control module*2.5 – 3.6 V
Refer to “Reference waveform No. 3: ”
E04-2CAN communication line (low)
for ABS control module*1.6 – 2.5 V
E04-3 — — —
E04-4 Generator “L” terminal10 – 14 V Engine is running
0 V Ignition switch is at ON position
E04-5 Brake fluid level switch*0 – 3 V
↑↓
10 – 14 VRefer to “Reference waveform No. 1: ”
0 VIgnition switch is at ON position, parking brake
lever is released and brake fluid level is lower
than MIN level
E04-6 — — —
E04-7 — — —
E04-8Sensor ground for outside air
temperature sensor (if
equipped)0 V —
E04-9Serial communication line of
data link connector for ABS
control module7 – 12 V Ignition switch is at ON position
E04-10Outside air temperature sensor
(if equipped)About 1.5 VIgnition switch is at ON position and outside
air temperature approx. 20 °C (68
°F)
E04-11 Oil pressure switch*3 – 14 V Refer to “Reference waveform No. 4: ”
0 VIgnition switch is at ON position and engine is
at stop
E04-12 — — — Terminal Circuit Normal voltage Condition

Downloaded from www.Manualslib.com manuals search engine 10B-23 Body Electrical Control System:
BCM connector “G04”E04-13 — — —
E04-14 — — —
Terminal Circuit Normal voltage Condition
G04-1CAN communication line (low)
for DLC*1.6 – 2.5 V
Refer to “Reference waveform No. 3: ” G04-2CAN communication line (low)
for each control module*1.6 – 2.5 V
G04-3CAN communication line
(high) for DLC*2.5 – 3.6 V
G04-4CAN communication line
(high) for each control module*2.5 – 3.6 V
G04-5Serial communication line of
data link connector 7 – 12 V Ignition switch is at ON position
G04-6 — — —
G04-7 — — —
G04-8 Theft deterrent light10 – 14 V Theft deterrent light is not lit up
0 V Theft deterrent light is lit up
G04-9 — — —
G04-10 — — —
G04-11Serial communication line for
information display and HVAC
control module (if equipped)*0 – 1 V
↑↓
10 – 14 VRefer to “Reference waveform No. 5: ”
G04-12Ground for keyless entry
receiver (if equipped)0 V —
G04-13Power supply for keyless
entry receiver (if equipped)4 – 6 V Ignition switch is at all positions
G04-14Signal for keyless entry
receiver (if equipped)*0 – 1 V
↑↓
4 – 6 VRefer to “Reference waveform No. 6: ”
G04-15 Vehicle speed signal output*0 – 1 V
↑↓
4 – 6VRefer to “Reference waveform No. 7: ”
G04-16 Key reminder switch10 – 14 V Ignition key is inserted to ignition key cylinder
0 VIgnition key is pulled out from ignition key
cylinder
G04-17Rear end door window
defogger switch*3 – 14 V Refer to “Reference waveform No. 8: ”
0 VIgnition switch is at ON position and rear end
door window defogger switch is pushed
G04-18 A/C switch (if equipped)*3 – 14 V Refer to “Reference waveform No. 8: ”
0 VIgnition switch is at ON position, blower speed
selector is at any position other than OFF
position and A/C switch is at ON position
G04-19 — — —
G04-20 — — —
G04-21 Rear wiper INT switch*0 – 1 V
↑↓
10 – 14 VRefer to “Reference waveform No. 9: ”
0 VIgnition switch is at ON position and rear
wiper switch is at INT position
G04-22 Rear wiper low switch*0 – 1 V
↑↓
10 – 14 VRefer to “Reference waveform No. 9: ”
0 VIgnition switch is at ON position and rear
wiper switch is at LOW position Terminal Circuit Normal voltage Condition

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Reference waveform No. 1
Parking brake or brake fluid level switch signal (1)
Reference waveform No. 2
Driver seat belt switch signal (1)Reference waveform No. 3
CAN communication signal
Reference waveform No. 4
Oil pressure switch signal (1) Measurement terminal Parking brake switch
CH2: “L01-6” to “G271-3”
Brake fluid level switch
CH2: “E04-5” to “G271-3”
Oscilloscope setting CH1: 5 V / DIV
TIME: 10 ms / DIV
Measurement
conditionParking brake switch:
• Ignition switch is at ON
position, parking brake lever
is released
Brake fluid level switch
• Ignition switch is at ON
position, brake fluid level is in
normal
Measurement terminal CH2: “L01-14” to “G271-3”
Oscilloscope setting CH2: 5 V/DIV
TIME: 4 ms/DIV
Measurement
conditionIgnition switch is at ON position
and driver side seat belt is
fastened
I4RS0AA20018-02
I4RS0AA20016-02
Measurement terminal CAN communication signal for
ABS control module
CH2: “E04-1” to “G271-3”
CH3: “E04-2” to “G271-3”
CAN communication signal for
DLC
CH2: “G04-3” to “G271-3”
CH3: “G04-1” to “G271-3”
CAN communication signal for
each control module
CH2: “G04-4” to “G271-3”
CH3: “G04-2” to “G271-3”
Oscilloscope setting CH2: 1 V/DIV
CH3: 1 V/DIV
TIME: 40 µs/ DIV
Measurement
conditionIgnition switch is at ON position
1. CAN communication line signal (High)
2. CAN communication line signal (Low)
Measurement terminal CH2: “E04-11” to “G271-3”
Oscilloscope setting CH2: 5 V / DIV
TIME: 10 ms / DIV
Measurement
conditionEngine is running and oil
pressure is in normal condition
I4RS0AA20017-02
I4RS0AA20018-02

Downloaded from www.Manualslib.com manuals search engine Immobilizer Control System: 10C-1
Control Systems
Immobilizer Control System
Precautions
Precautions in Diagnosing TroublesS6RW0DA300001
• Before confirming the diagnostic trouble code (DTC),
do not disconnect connector from ECM, battery cable
from battery, ground wire harness, or main fuse. Such
disconnection will erase DTC stored in ECM.
• DTC stored in ECM memory can be checked as well
as cleared by using SUZUKI scan tool. Before using
SUZUKI scan tool, read its operator’s manual
carefully to know how to use it and what functions are
available.
• Be sure to read “Precautions for Electrical Circuit
Service in Section 00” before inspection.
• Communication of ECM, BCM, ABS control module,
TCM (if equipped), 4WD control module (if equipped),
keyless start control module (if equipped),
combination meter and DLC is established by CAN
(Controller Area Network). Therefore, handle CAN
communication lines with care referring to “Precaution
for CAN Communication System in Section 00”.
For CAN communication system, refer to description
on “CAN Communication System Description in
Section 1A”.
Precaution in Replacing ECMS6RW0DA300002
• If ECM is replaced with new or used one without
Immobilizer control function, the engine will not be
started. In case of the above, check if the newly
installed ECM has Immobilizer control function.
• 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. Or, the
engine cannot be started up. For the registration
procedure, refer to “Procedure after ECM
Replacement”.
Precaution in Replacing Ignition KeyS6RW0DA300003
To register ignition key in case of replacing key(s) and/or
making spare key(s), the transponder code in the ignition
key is registered with ECM. Or the engine can not be
started up. For the registration procedure, refer to
“Registration of the Ignition Key”.
Precautions in Handling Immobilizer Control
System
S6RW0DA300004
• Do not turn ON ignition switch with ignition key in
contact with another one or quite close to another
one. Or, the immobilizer control system may detect
some abnormal condition and prevent the engine from
starting.
• Do not turn ON ignition switch by using ignition key
with any type of metal (1) wrapped its grip or in
contact with it. Or, the immobilizer control system may
detect some abnormal condition and prevent the
engine from starting.
I3RH0AA30001-01
1
I3RH0AA30002-01

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• Do not leave ignition key in a place where
temperature is high. High temperature may cause
damage to the transponder built in the ignition key.• Do not turn ignition switch to ON position by bringing
radio antenna close to coil antenna. Or, the
immobilizer control system may detect some
abnormal condition and prevent the engine from
starting.
General Description
Immobilizer Control System IntroductionS6RW0DA301001
The immobilizer control system is an anti-theft device that immobilizes the vehicle. It stops the engine from working
and prevents the vehicle from being stolen. It mainly consists of the following components. For immobilizer control
system components location, refer to “Immobilizer Control System Components Location”.
•ECM
• ICM with the built-in coil antenna
• Ignition key with the built-in transponder
A code called the transponder code is memorized in the transponder. And, the code is registered with ECM. Basically,
when the ignition switch is turned ON, ECM reads the code by the coil antenna. Then, if the code in transponder in the
ignition key does not match with the one registered with ECM, ECM stops the operation of the fuel injection so as not
to start up the engine and turns the immobilizer indicator light ON and OFF using CAN communication lines. (In
addition to the above operation, ECM also turns the immobilizer indicator light ON and OFF when some trouble is
detected in the keyless start system.)
On-Board Diagnostic System Description (Self-diagnosis Function)S6RW0DA301002
ECM diagnoses if there is any trouble with the immobilizer control system. The diagnostic information is stored as the
diagnostic trouble code (DTC) in ECM. To read the diagnostic information, use SUZUKI scan tool referring to “DTC
Check”.
With the ignition switch turned ON (but the engine at stop) regardless of the condition of the engine and emission
control system, ECM indicates whether there is any trouble with the immobilizer control system or not by either lighting
ON or flashing ON and OFF the immobilizer indicator light.
Immobilizer indicator light lights ON:
No trouble exists in the immobilizer control system. (After starting up the engine, the light turns OFF.)
Immobilizer indicator light flashes ON and OFF:
There is some trouble in the immobilizer control system or in the keyless start system. Its diagnostic information is
stored in ECM.
I3RH0AA30003-01
I3RH0AA30004-01

Downloaded from www.Manualslib.com manuals search engine Immobilizer Control System: 10C-7
DTC TableS6RW0DA304004
ECM
NOTE
ECM detects DTC. ICM does not.

NOTE
If any DTC other than the above DTCs is detected, refer to “DTC Table in Section 1A”.

DTC No. Detecting Item Detecting ConditionImmobilizer
Indicator
Light
) P1614 Transponder response errorTransponder code in transponder built in
ignition key cannot be read through ICM.Flash
) P1615 Steering lock unit communication error• While registering the transponder code in
the transponder built in the ignition key in
ECM, the keyless start control module sent
a signal to ECM indicating that the ID code
could not be registered.
• The ID code could not be registered in the
keyless start control module or ECM.Flash
) P1616 Unregistered keyless start control moduleECM detects different ID codes registered in
ECM and keyless start control module.Flash
) P1618Keyless start control module CAN
communication errorReception error of communication data for
keyless start control module is detected for
longer than specified time continuously.Flash
) P1621 Immobilizer communication line error Communication error between ICM and ECM. Flash
) P1622 EEPROM reading / writing error EEPROM in ECM is corrupted. Flash
) P1623 Unregistered transponderTransponder code in the transponder built in
the ignition key is invalid.Flash
) P1625 Immobilizer antenna error ICM is faulty. Flash
) P1636Immobilizer information registration
failureCommunication error between ECM and BCM. No operation
) P1638 Immobilizer information mismatched• Communication error between ECM and
BCM.
• Wrong ECM or BCM is used.No operation

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DTC P1618: Keyless Start Control Module CAN Communication ErrorS6RW0DA304011
Refer to “Troubleshooting for CAN-DTC in Section 1A”.
DTC P1621: Immobilizer Communication Line ErrorS6RW0DA304012
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
TroubleshootingDetecting Condition Trouble Area
Communication error between ICM and ECM. • Related fuse(s) blown
• Poor connection at ICM connector
• Poor connection at ECM connector
• Power supply circuit
• Ground circuit
• Communication circuits between ICM and ECM
•ICM
•ECM
Step Action Yes No
1Was “Immobilizer Control System Check” performed?Go to Step 2. Go to “Immobilizer
Control System Check”.
2Fuse check
1) Check fuse for ICM circuit.
Is fuse in good condition?Replace blown fuse(s)
and then, check for
short circuit.Go to Step 3.
3Voltage check at power and ground terminal
1) Check power and ground terminal voltage of ICM
connector referring to “Inspection of ICM and Its Circuit”.
Is each terminal voltage in good condition?Go to Step 4. Repair circuit.
4ICM and ECM connector check
1) With the ignition switch at OFF position, check
intermittent and poor connection of ICM connector and
ECM connectors referring to “Intermittent and Poor
Connection Inspection in Section 00”.
Is each connector in good condition?Go to Step 5. Repair poor connection.
5Communication circuit check between ICM and ECM
1) Check for open, short and high resistance in serial
communication and clock circuit between ICM and ECM.
Is each communication circuit in good condition?Substitute a known-
good ICM and recheck.
If DTC P1621 is still
detected, substitute a
known good ECM and
recheck.Repair circuit.