2008 SUZUKI SWIFT outside air

Downloaded from www.Manualslib.com manuals search engine 10B-9 Body Electrical Control System:
Diagnostic Information and Procedures
BCM Self-Diagnosis FunctionS7RS0BA204001
• BCM monitors conditions of the system components and its circuit with ignition switch turned to ON position. When
an abnormality in the system oc curs, the area where that abnormality lies is stored in the memory of EEPROM in
BCM.
• DTC can be checked in either one of following ways. – DTC can be checked by SUZUKI scan tool (2) connected to DLC (1).
– DTC can be read from flashing pattern of theft deterrent light (3). Also, DTC is displayed on combination meter
(4) at the same time.
BCM input / output table
4. Oil pressure switch 15. Rear end door window defogger switch 26. Rear wiper relay
5. Outside air temperature sensor (if equipped) 16. A/C switch
27. Rear end door window defogger relay
6. Door lock actuator (incorporated in key cylinder switch) 17. Hazard warning switch
28. Turn signal and hazard warning relay
7. Door switch 18. Rear wiper switch 29. Key reminder switch (included in ignition switch)
8. Interior light 19. Lighting switch
9. Rear end door opener switch 20. Manual door lock switch
3
1
2
4I4RS0BA20004-03
Control
Input Output
Power door lock system • Key cylinder switch
• Manual door lock switch • Each door lock actuator
Keyless entry system • Key reminder switch
• Keyless entry receiver
• Driver side door switch • Each door lock actuator
• Turn signal and hazard warning relay
• Interior light
Keyless start system
(Door lock function) • Keyless start control module
• Each door lock actuator
• Turn signal and hazard warning relay
• Interior light
Rear wiper • Rear wiper INT switch
• Rear wiper LO switch • Rear wiper relay
Combination meter • Tail light switch
• Oil pressure switch
• Parking brake switch
• Driver side seat belt switch
• Brake fluid level switch
• Generator
• Each door switch • Combination meter

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-12
Scan Tool DataS7RS0BA204003
Scan tool DataConditionNormal condition /
reference value
Vehicle Speed At stop with ignition switch turned ON 0 km/h
Outside air Temp Reference value is relative to outside air temperature –40
°C – 70 °C
(–40 °F – 158 ° F)
Battery Voltage At specified idle speed after warming up 10 – 14 V
Coolant Temp At specified idle speed after warming up 80
°C – 100 ° C
(176 °F – 212 ° F)
Engine Speed Engine idling with no load applied after warming up Desired idle speed
± 50 rpm
Fuel Consumption At specified idle speed after warming up 0.0 km/l
Key Reminder Sw Ignition key inserted in
ignition key cylinder Key in
Ignition key pulled out from ignition key cylinder Pulled
Rear Wiper Sw Rear wiper switch at ON position and ignition switch turned ON
ON
Rear wiper switch at INT position and ignition switch turned ON INT
Rear wiper switch at OFF position and ignition switch turned ON OFF
Door key Sw Key cylinder switch of driver side door at lock position
LOCK
Key cylinder switch of driver side door not turned Neutral
Key cylinder switch of driver side door at unlock position Unlock
Door Lock Sw Lock side of manual door lock switch pressed
LOCK
Manual door lock switch not pressed Neutral
Unlock side of manual door lock switch pressed Unlock
Driv Door Sw Driver side door open
Open
Driver side door closed Close
Pass Door Sw Doors other than driver side door open
Open
Doors other than driver side door closed Close
Brake Fluid Level Brake fluid level at MIN level or higher
Normal
Brake fluid level lower than MIN level Low
Parking Brake Sw Parking brake lever pulled
ON
Parking brake lever released OFF
Rear Defogger Sw Rear end door window defogger switch turned ON with engine
running
ON
Rear end door window defogger switch turned OFF with engine
running OFF
Tail Light Sw Lighting switch at HEAD
or CLEARANCE position ON
Lighting switch at OFF position OFF
Driv Seatbelt Sw Driver side seat belt fastened
Fasten
Driver side seat belt unfastened Unfasten
Rear end door opener Rear end door open
ON
Rear end door closed OFF
“3” Position Sw A/T select lever at 2nd or 3rd position with ignition switch turned
ON
ON
A/T select lever at other than 2nd or 3rd position with ignition
switch turned ON OFF
Charge Lamp Engine at stop with ignition switch turned ON
ON
Engine running OFF
Oil pressure switch Engine at stop with ignition switch turned ON
ON
Engine running OFF
A/C Switch A/C and ignition switch turned ON
ON
A/C switch turned OFF OFF

Downloaded from www.Manualslib.com manuals search engine 10B-13 Body Electrical Control System:
Scan Tool Data Definitions
Vehicle Speed (km/h, mph): It is computed based on pulse signals from vehicle speed sensor on transmission.
Outside air Temp ( °C, °F): It is detected by outside air temperature sensor.
Battery Voltage (V): This parameter indicates battery po sitive voltage inputted to BCM.
Coolant Temp (Engine coolant temperature) ( °C, °F): It is detected by engine coolant temperature sensor.
Engine Speed (RPM): It is computed by reference pulse signals from CMP sensor.
Fuel Consumption (km/l): This parameter indicates the fuel consumption computed by ECM.
Key Reminder Sw (Key reminder switch) (Pulled / Key in): This parameter indicates the state of the key reminder
switch.
Rear Wiper Sw (Rear wiper switch) (ON / INT / OFF): This parameter indicates the state of the rear wiper switch.
Door key Sw (Door key cylinder switch) (Lock / Neutral / Unlock): This parameter indicates the state of the door
key cylinder switch.
Door lock Sw (Manual door lock switch) (Lock / Neutral / Unlock): This parameter indicates the state of the
manual door lock switch.
Driv Door Sw (Driver side d oor switch) (Open / Close): This parameter indicates the state of the driver side door
switch.
Pass Door Sw (Other than driver side door switch) (Open / Close): This parameter indicates the state of the door
switches other than driver side door switch.
Brake Fluid Level (Low / Normal): Low: Brake fluid level is lower than specified level.
Normal: Brake fluid level is higher than MIN level.
Parking Brake Sw (Parking brake switch) (ON / OFF): ON: Parking brake lever is pulled up.
OFF: Parking brake lever is released.
Rear Defogger Sw (Rear end door window defogger switch) (ON / OFF): This parameter indicates the state of
the rear end door window defogger switch.
Tail Light Sw (Lighting switch) (ON / OFF): This parameter indicates the state of the lighting switch.
Driv Seatbelt Sw (Driver seat belt switch) (Fasten / Unfasten): This parameter indicates the state of the driver
side seat belt buckle switch.
Rear end Door Opener (Rear end door opener switch) (ON / OFF): This parameter indicates the state of the rear
end door opener switch.
“3” position Sw (ON/OFF): This parameter indicates the state of the “3 ” position switch included in A/T manual
selector assembly.
Charge lamp (ON / OFF): This parameter indicates the state of the charge system monitor switch.
Oil pressure switch (ON / OFF): This parameter indicates the state of the oil pressure switch.
A/C Switch (ON / OFF): This parameter indicates the state of the air conditioning switch.
Diagnosis Using Output Test Function of SUZUKI Scan Tool
SUZUKI scan tool has the output test function which can force operation of following actuators and relays of the
system controlled by BCM. When a malf unction is found in the system controlled by BCM, execute the output test
which enables easy judgment whether the malfunction is on the input side or output side of BCM. For detailed
information on operation of SUZUKI scan tool, refer to “SUZUKI Scan Tool Operator’s Manual”.
Output Teat Item Controlled Parts
Hazard Warning Light Turn signal and hazard warning relay
Interior (Dome) Light Interior (Dome) light (wh en interior light switch is at DOOR position)
Door Each door lock actuator
Rear end door open Rear end door opener relay
Warning buzzer Warning buzzer (in BCM)
Rear wiper Rear wiper relay
Alarm indicator Theft deterrent light (in information display or clock)
Rear defogger Rear end door window defogger relay

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-14
DTC TableS7RS0BA204004
DTC CheckS7RS0BA204005
Using SUZUKI Scan Tool1) 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 communica tion was not possible.
5) After completing the check, turn ignition switch off and disconnect SUZUKI scan tool from data link
connector.
DTC
(displayed
on SUZUKI scan tool) DTC (indicated
by theft
deterrent light) DTC (displayed on
odometer in
combination meter) Detected item Detecting condition
NO DTC 0000 0000 — No DTC detected
) B1133 1133 b1133 Battery voltage too high Battery voltage too high
) B1141 1141 b1141 Outside air temperature
(ambient temperature) sensor
circuit openSensor output voltage too high
) B1142 1142 b1142 Outside air temperature
(ambient temperature) sensor
circuit short to groundSensor output voltage too low
) B1150 1150 b1150 Air bag communication circuit
malfunctionAir bag communication circuit
open or short to ground
) B1157 1157 b1157 Air bag deployment signal input Air bag deployment signal
inputted
) B1170 1170 b1170 EEPROM access error Memory error
)
U0155 0155 U0155 Lost communication with
instrument panel cluster (IPC)
control moduleReceiving error of BCM from
combination mete
r for specified
time continuously
) U1073 1073 U1073 Control module communication
bus offTransmitting and receiving error
of BCM for specified time
continuously
) U1100 1100 U1100 Lost communication with ECM Receiving error of BCM from
ECM for specified time
continuously
) U1101 1101 U1101 Lost communication with TCM Receiving error of BCM from
TCM for specified time
continuously
) U1144 1144 U1144 Lost communication with
keyless start control moduleReceiving error of BCM from
keyless start control module for
specified time continuously
(A)
I4RS0BA20005-01

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-18
DTC B1141 / DTC B1142 (No. 1141 / No. 1142): Outside Air Temperature (Ambient Temp.) Sensor
Circuit Malfunction
S7RS0BA204009
Wiring Diagram
DTC Detecting Condition and Possible Cause
Flow Test Description
Step 1: Check whether malfunction is in outside air temperature sensor.
Step 2: Check outside air temperature sensor input circuit.
Step 3: Check outside air temperature sensor ground circuit (for DTC B1141).
DTC Troubleshooting
I4RS0AA20010-01
[A]: BCM connector viewed from harness side 3. Junction block assembly
1. Outside air temperature sensor 4. Outside air temperature sensor connector
2. BCM
DTC detecting condition Possible cause
DTC B1141 (DTC No. 1141):
Input signal from outside air temperature sensor is higher
than 4.88 V. • Open in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction
DTC B1142 (DTC No. 1142):
Input signal from outside air temperature sensor is lower
than 0.1 V. • Short in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction
Step
Action YesNo
1 Check outside air temperature sensor
1) Turn ignition switch to OFF position.
2) Disconnect connector from outside air temperature
sensor.
3) Check outside air temperature sensor for resistance referring to “Outside Air Temperature Sensor Inspection
(If Equipped) in Section 9C”.
Is it in good condition? Go to Step 2.
Replace outside air
temperature sensor.

Downloaded from www.Manualslib.com manuals search engine 10B-19 Body Electrical Control System:
DTC B1150 (No. 1150): Air Bag Communication Circuit MalfunctionS7RS0BA204010
Wiring Diagram
DTC Detecting Condition and Possible Cause
Flow Test Description
Step 1: Check air bag communication circuit.
Step 2: Check air bag communication circuit.
Step 3: Check air bag communication circuit. 2
Check outside air temperature sensor circuit
1) Turn ignition switch to ON position.
2) Measure voltage between “E14-2” terminal of outside air
temperature sensor connector and vehicle body ground.
Is voltage 4 – 6 V? Go to Step 3. Open or short in “YEL/
RED” wire circuit. If OK,
substitute a known-
good BCM (included in
junction block
assembly) and recheck.
3 Check outside air temperature sensor circuit
1) Turn ignition switch to OFF position.
2) Check for proper connection to “E46-8” terminal of BCM
connector.
3) If OK, measure resistance between “E14-1” terminal of outside air temperature sens or connector and vehicle
body ground.
Is resistance 1
Ω or less? Substitute a known-
good BCM (included in
junction block
assembly) and recheck.
Open or high resistance
in “YEL/BLK” wire
circuit.
Step Action Yes No
I4RS0AA20011-01
[A]: Junction block assembly connect
or viewed from harness side 2. BCM
1. SDM 3. Junction block assembly
DTC detecting conditionPossible cause
After ignition switch is turned on, abnormal signal is fed
from SDM to BCM. • Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction

Downloaded from www.Manualslib.com manuals search engine Body Electrical Control System: 10B-32
BCM connector “E46”L01-8
“3” position switch
(A/T model) *0 – 1 V
↑↓
10 – 14 V Refer to “Reference waveform No. 2: ”
0 V Ignition switch is at ON positi
on and A/T select lever is at
“2” or “3” position
L01-9 — — —
L01-10 Driver side door lock actuator
control (Unlock) (if equipped) 10 – 14 V Unlock signal is output for driver side door lock actuator.
0 V Unlock signal is not output for driver side door lock
actuator.
L01-11 Rear end door opener
actuator control 0 V Rear end door opener actuator is not in operation
10 – 14 V Rear end door opener actuator is in operation
L01-12 Manual door lock switch
(Lock) 10 – 14 V
Manual door lock switch is at any position other than lock
position
0 V Manual door lock swit ch is at lock position
L01-13 — — —
L01-14 Driver side seat belt switch *0 – 3 V
↑↓
10 – 14 V Refer to “Reference waveform No. 3: ”
0 V Ignition switch is at ON position and driver side seat belt
is unfastened
L01-15 Door switch (other than driver
side door and rear end door) 10 – 14 V
Rear right and left side door and passenger side door are
closed
0 V Any one of the door is opened (except driver side door
and rear end door)
L01-16 Driver side door key cylinder switch (Lock) 10 – 14 V
Driver side door key cylinder switch is at any position
other than lock position
0 V Driver side door key cylinder switch is at lock position
L01-17 Driver side door key cylinder
switch (Unlock) 10 – 14 V
Driver side door key cylinder switch is at any position
other than unlock position
0 V Driver side door key cylinder switch is at unlock position
L01-18 — — —
Terminal Circuit Normal voltage Condition
Terminal
CircuitNormal voltage Condition
E46-1 CAN communication line
(high) for ABS/ESP
® control
module *2.5 – 3.6 V
Refer to “Reference waveform No. 4: ”
E46-2 CAN communication line
(low) for ABS/ESP
® control
module *1.6 – 2.5 V
E46-3 — — —
E46-4 Generator “L” terminal 10 – 14 V Engine is running
0 V Ignition switch is at ON position
E46-5 Brake fluid level switch *0 – 3 V
↑↓
10 – 14 V Refer to “Reference waveform No. 1: ”
0 V Ignition switch is at ON position, parking brake lever is
released and brake fluid level is lower than MIN level
E46-6 — — —
E46-7 — — —
E46-8 Sensor ground for outside air
temperature sensor
(if equipped) 0 V
—
E46-9 Serial communication line of
data link connector for ECM,
TCM, ABS and
P/S control
module 8 – 12 V Ignition switch is at ON position
E46-10 Outside air temperature
sensor (if equipped) About 1.5 VIgnition switch is at ON position and outside air
temperature approx. 20
°C (68 °F)

Downloaded from www.Manualslib.com manuals search engine 10B-39 Body Electrical Control System:
Repair Instructions
BCM (Included in Junction Block Assembly)
Removal and Installation
S7RS0BA206001
CAUTION!
Do not attempt removal of BCM from junction
block assembly 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 assembly mounting nuts (3).
5) Disconnect connectors from BCM and junction block assembly.
6) Detach wiring harness clamp from junction block assembly.
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”.
Outside Air Temperature Sensor Removal and
Installation
S7RS0BA206002
For removal and installation, refer to “Outside Air
Temperature Sensor Removal and Installation (If
Equipped) in Section 9C”.
Outside Air Temperature Sensor InspectionS7RS0BA206003
For inspection, refer to “Outside Air Temperature Sensor
Inspection (If Equipped) in Section 9C”.
Security Alarm Mode Selection Procedure (If
Equipped)
S7RS0BA206004
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
4. BCM 5. Junction block assembly
I4RS0BA20010-01
4
3
1
2
I5RS0DA20007-01