electrical SUZUKI SX4 2006 1.G Service Manual Online

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-20
DTC B1157 (No. 1157) Air Bag Deployment Signal InputS6RW0DA204011
Wiring Diagram
Refer to “DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction”.
DTC Detecting Condition and Possible Cause
Flow Test Description
Step 1: Check DTC for SDM.
DTC Troubleshooting
DTC B1170 (No. 1170): EEPROM Access ErrorS6RW0DA204012
DTC Detecting Condition and Possible Cause
DTC Troubleshooting
NOTE
Before performing steps below, be sure to perform “Body Electrical Control System Check”.

1) Ignition switch OFF.
2) Replace BCM.
3) Repeat BCM Check Flow Table.
DTC U0073 (No. 0073): Control Module Communication Bus OffS6RW0DA204013
Refer to “Troubleshooting for CAN-DTC in Section 1A”.
DTC U0100 (No. 0100): Lost Communication with ECMS6RW0DA204014
Refer to “Troubleshooting for CAN-DTC in Section 1A”.
DTC U0101 (No. 0101): Lost Communication with TCMS6RW0DA204018
Refer to “Troubleshooting for CAN-DTC in Section 1A”.
DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control ModuleS6RW0DA204015
Refer to “Troubleshooting for CAN-DTC in Section 1A”.
DTC U1144 (No. 1144): Lost Communication with Keyless Start Control ModuleS6RW0DA204016
Refer to “Troubleshooting for CAN-DTC in Section 1A”. DTC detecting condition Possible cause
Air bag deployment signal is fed from SDM to BCM. • Air bag component parts
• BCM malfunction
Step Action Yes No
1DTC check of SDM
1) Check DTC stored in SDM referring to “DTC Check in
Section 8B”.
Is DTC B1021 detected?Go to “DTC B1021:
Front Air Bag
Deployment Record in
Section 8B”.Substitute a known-
good BCM (included in
junction block) and
recheck.
DTC detecting condition Possible cause
Data write error or check sum error. BCM malfunction

Downloaded from www.Manualslib.com manuals search engine 10B-21 Body Electrical Control System:
Inspection of BCM and Its CircuitsS6RW0DA204017
BCM and its circuits can be checked at BCM wiring couplers by measuring voltage and resistance.
CAUTION!
BCM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to BCM
with couplers disconnected from it.

Voltage Check
1) Disconnect negative cable (–) at battery.
2) Remove BCM (included in junction block) referring to “BCM (Included in Junction Block) Removal and Installation”.
3) Connect connectors to BCM (1) and junction block (2).
4) Check voltage at each terminal number of couplers connected.
For connector and terminal number, refer to “Connector Layout Diagram of BCM and Junction Block”.
NOTE
• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when
ignition switch is ON.
• Voltage with asterisk (*) can not be measured by voltmeter because it is pulse signal.
Check it with oscilloscope if necessary.

BCM connector “L01”
1
2
1
2
I4RS0AA20030-01
Terminal Circuit Normal voltage Condition
L01-1Passenger side door lock
actuator control (Unlock) (if
equipped)10 – 14 VUnlock signal is output for passenger side
door lock actuator
0 VUnlock signal is not output for passenger side
door lock actuator
L01-2 — — —
L01-3 Rear end door switch10 – 14 V Rear end door is closed
0 V Rear end door is opened
L01-4Rear end door opener switch
(if equipped)10 – 14 V Rear end door opener switch is not pushed
0 V Rear end door opener switch is pushed
L01-5Manual door lock switch
(Unlock) (if equipped)10 – 14 VManual door lock switch is at any position
other than unlock position
0 V Manual door lock switch is at unlock position
L01-6 Parking brake switch*0 – 3 V
↑↓
10 – 14 VRefer to “Reference waveform No. 1: ”
0 VIgnition switch is at ON position and parking
brake lever is pulled up
L01-7 Driver side door switch10 – 14 V Driver side door is closed
0 V Driver side door is opened
L01-8 — — —
L01-9 — — —

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-22
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

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-24
Junction block connector “E324”
Junction block connector “E325”
Junction block connector “G271”
Junction block connector “G272”
Junction block connector “G273”
Junction block connector “L312”
Junction block connector “L313”Terminal Circuit Normal voltage Condition
E324-2 Backup power source 10 – 14 V Ignition switch is at all positions
Terminal Circuit Normal voltage Condition
E325-3 Horn10 – 14 V Horn switch is at ON position
0 V Horn switch is at OFF position
Terminal Circuit Normal voltage Condition
G271-3 Ground for BCM 0 V Ignition switch is at all positions
G271-7Rear end door window
defogger indicator light10 – 14 VEngine is running and rear end door window
defogger indicator light is lit up
0 VEngine is running and rear end door window
defogger indicator light is not lit up
Terminal Circuit Normal voltage Condition
G272-3 Horn switch10 – 14 V Horn switch is not pushed
0 V Horn switch is pushed
G272-7 Lighting switch10 – 14 VEngine is running (with DRL model) or lighting
switch is at any position other than OFF
position
0 V Lighting switch is at OFF position
G272-9 Ground for BCM 0 V Ignition switch is at all positions
G272-11 Hazard warning switch10 – 14 V Hazard warning switch is at OFF position
0 VHazard warning switch is at ON position or
lock or unlock button of keyless entry
transmitter (answer back control) is pushed
Terminal Circuit Normal voltage Condition
G273-2 Power source (IG)10 – 14 V Ignition switch is at ON position
0 VIgnition switch is at any position other than
ON position
G273-5 Power source (ACC)10 – 14 V Ignition switch is at ACC or ON position
0 VIgnition switch is at any position other than
ACC or ON position
Terminal Circuit Normal voltage Condition
L312-4Power supply for rear wiper
motor10 – 14 VIgnition switch is at ON position
L312-5 Interior light10 – 14 VInterior light switch is at DOOR position and
interior light is not lit up
0 VInterior light switch is at DOOR position and
interior light is lit up
Terminal Circuit Normal voltage Condition
L313-2 Air bag communication line*0 – 1 V
↑↓
4 – 6 VRefer to “Reference waveform No. 10: ”
L313-3Serial communication line of
data link connector for SDM7 – 12 V Ignition switch is at ON position

Downloaded from www.Manualslib.com manuals search engine 10B-25 Body Electrical Control System:
Junction block connector “L314”
Junction block connector “L315”Terminal Circuit Normal voltage Condition
L314-4 Ground for BCM 0 V Ignition switch is at all positions
L314-6Right side door mirror heater
(if equipped)10 – 14 VEngine is running and rear end door window
defogger is in operation
0 VEngine is running and rear end door window
defogger is not in operation
L314-7Left side door mirror heater (if
equipped)10 – 14 VEngine is running and rear end door window
defogger is in operation
0 VEngine is running and rear end door window
defogger is not in operation
L314-8Rear end door window
defogger wire10 – 14 VEngine is running and rear end door window
defogger is in operation
0 VEngine is running and rear end door window
defogger is not in operation
L314-9 Rear wiper control10 – 14 VIgnition switch is at ON position and rear
wiper is not in operation
0 VIgnition switch is at ON position and rear
wiper is in operation
Terminal Circuit Normal voltage Condition
L315-1Door lock actuator control
(Dead lock) (if equipped)10 – 14 VDriver side key cylinder is turned to lock twice
with in 3 seconds
0 VManual door lock switch is at any position
other than LOCK position and driver side door
key cylinder switch is at any position other
than LOCK position
L315-9Door lock actuator control
(Unlock) (if equipped)10 – 14 VUnlock signal is output for rear door lock
actuator
0 VUnlock signal is not output for rear door lock
actuator
L315-10Door lock actuator control
(Lock) (if equipped)10 – 14 V Lock signal is output for all door lock actuators
0 VLock signal is not output for all door lock
actuators

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-26
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 10B-27 Body Electrical Control System:
Reference waveform No. 5
Information display and HVAC control module serial
communication signal (1)
Reference waveform No. 6
Keyless entry receiver signal (1)Reference waveform No. 7
Vehicle speed pulse output signal (1)
Reference waveform No. 8
A/C or rear end door window defogger switch signal (1) Measurement terminal CH2: “G04-11” to “G271-3”
Oscilloscope setting CH2: 5 V / DIV
TIME: 2 ms / DIV
Measurement
conditionIgnition switch is at ON position
Measurement terminal CH2: “G04-14” to “G271-3”
Oscilloscope setting CH2: 2 V / DIV
TIME: 200 ms / DIV
Measurement
conditionLock or unlock button of
keyless entry transmitter is
pushed
I4RS0AA20021-02
I4RS0AA20022-02
Measurement terminal CH1: “G04-15” to “G271-3”
Oscilloscope setting CH1: 2 V / DIV
TIME: 100 ms / DIV
Measurement
conditionVehicle speed at 10 km/h (6
mph)
Measurement terminal Rear end door window
defogger switch
CH2: “G04-17” to “G271-3”
A/C switch
CH2: “G04-18” to “G271-3”
Oscilloscope setting CH2: 5 V/DIV
TIME: 10 ms/DIV
Measurement
conditionRear end door window
defogger switch:
• Ignition switch is at ON
position and rear end door
window defogger switch is
not pushed
A/C switch:
• Ignition switch is at ON
position, A/C switch or
blower speed selector is at
OFF position
I5RW0AA20014-01
I4RS0AA20023-02

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-28
Reference waveform No. 9
Rear wiper switch signal (1)Reference waveform No. 10
SDM communication signal (1)
Repair Instructions
BCM (Included in Junction Block) Removal and
Installation
S6RW0DA206001
CAUTION!
Do not attempt removal of BCM from junction
block as it may cause contact failure.
If there is faulty condition in BCM, replace
junction block assembly.

Removal
1) Disconnect negative cable from battery.
2) Disable air bag system referring to “Disabling Air
Bag System in Section 8B”.
3) Remove dash side trim (1) and steering column hole
cover (2).
4) Remove junction block mounting nuts (3). Measurement terminal Rear wiper INT switch
CH2: “G04-21” to “G271-3”
Rear wiper LOW switch
CH2: “G04-22” to “G271-3”
Oscilloscope setting CH2: 5 V/DIV
TIME: 10 ms/DIV
Measurement
conditionRear wiper INT switch:
• Ignition switch is at ON
position and rear wiper
switch is at any position
other than INT position
Rear wiper LOW switch:
• Ignition switch is at ON
position and rear wiper
switch is at any position
other than LOW position
I4RS0AA20024-02
Measurement terminal CH2: “L314-2” to “G271-3”
Oscilloscope setting CH2: 2 V / DIV
TIME: 400 ms / DIV
Measurement
conditionIgnition switch is at ON
position
I4RS0AA20026-02
4. BCM 5. Junction block
2
1
3
3
4
5
I5RW0AA20015-01

Downloaded from www.Manualslib.com manuals search engine 10B-29 Body Electrical Control System:
5) Disconnect connectors from BCM and junction
block.
6) Detach wiring harness clamp from junction block.
Installation
Reverse removal procedure for installation, noting
following points.
• Connect connectors securely.
• Enable air bag system referring to “Enabling Air Bag
System in Section 8B”.
• With keyless entry system (other than keyless start
model), if BCM is replaced, register transmitter code
into BCM, referring to “Programming Transmitter
Code for Keyless Entry System (Other than Keyless
Start Model) in Section 9F”.
Security Alarm Mode Selection Procedure (If
Equipped)
S6RW0DA206005
Security alarm mode can be selected by performing the
following procedure.
1) Confirm that all doors are closed, all doors are
unlocked and ignition key is inserted in ignition key
cylinder.
2) Remove ignition key from ignition key cylinder.
3) Perform Step a) through e) described below within
15 seconds.
a) Insert ignition key (1) in ignition key cylinder (2).
b) Remove ignition key from ignition key cylinder.
c) Repeat Step a) and b) twice.
d) Insert ignition key in ignition key cylinder.
e) Push lock side (3) of driver side manual lock
switch (4) 3 times.4) When Step 3) is completed, the mode changes to
the next one automatically. The warning buzzer
(located in BCM) sounds by the number of specified
for each mode as follows.
• Changed from A mode to B mode: Buzzer sounds
4 times
• Changed from B mode to A mode: Buzzer sounds
once
Outside Air Temperature Sensor Removal and
Installation
S6RW0DA206002
For removal and installation, refer to “Outside Air
Temperature Sensor Removal and Installation (If
Equipped) in Section 9C”.
Outside Air Temperature Sensor InspectionS6RW0DA206003
For inspection, refer to “Outside Air Temperature Sensor
Inspection (If Equipped) in Section 9C”.
Special Tools and Equipment
Special ToolS6RW0DA208001
1 2
4
3
I7JB01A20007-01
SUZUKI scan tool
—
This kit includes following
items. 1. Tech 2, 2. PCMCIA
card, 3. DLC cable, 4. SAE
16/19 adapter, 5. Cigarette
cable, 6. DLC loop back
adapter, 7. Battery power
cable, 8. RS232 cable, 9.
RS232 adapter, 10. RS232
loop back connector, 11.
Storage case, 12. )