Suzuki Grand Vitara JB419. Service manual - part 176

Body Electrical Control System:  10B-7

Scan Tool Data Definitions
Vehicle Speed (km/h, mph):  This parameter indicates the vehicle speed computed by ECM.
Outside air Temp (

°C, °F):  It is detected by outside air temperature sensor.

Battery Voltage (V):  This parameter indicates battery positive voltage inputted to BCM.
Coolant Temp (Engine coolant temperature) (

°C, °F):  This parameter indicates the engine coolant temperature 

computed by ECM.

Engine Speed (RPM):  This parameter indicates the engine speed computed by ECM.
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.

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 door 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 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 Seat belt Sw (Driver seat belt switch) (Fasten / Unfasten):  This parameter indicates the state of the driver 

side seat belt buckle switch.

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.
Rear Wiper Sw (Rear wiper switch) (ON / INT / OFF):  This parameter indicates the state of the rear wiper switch.
Front Fog Light Sw (Front fog light switch) (ON / OFF):  This parameter indicates the state of the front fog light 

switch.

Headlight Sw (Headlight switch) (ON / OFF):  This parameter indicates the state of the lighting 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 malfunction 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 Test Item

Controlled Parts

Hazard Warning Light

Turn signal and hazard warning relay

Interior (Dome) Light

Interior (Dome) light (when interior light switch is at DOOR position)

Parking/Tail Light

Tail light relay

Front Fog Light

Front fog light relay (when lighting switch is at CLEARANCE position)

Rear defogger

Rear defogger and mirror heater relays

D.R.L.

Headlight low beam relay

Auto on headlight

Headlight low beam and tail light relays

Door

Each door lock actuator

Dead lock

Each door lock actuator

Warning buzzer

Warning buzzer (in BCM)

Rear wiper

Rear wiper relay

Alarm indicator

Theft deterrent light (in HVAC control module)

10B-8 Body Electrical Control System: 

DTC Table

S5JB0BA204004

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 open

Sensor output voltage too 
high

)

 B1142

1142

b1142

Outside air temperature 
(ambient temperature) 
sensor circuit short to 
ground

Sensor output voltage too 
low

)

 B1150

1150

b1150

Air bag communication 
circuit malfunction

Air 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

)

 U1073

1073

U1073

Control module 
communication bus off

Transmitting 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

Body Electrical Control System:  10B-9

DTC U1073 (No. 1073): Control Module Communication Bus Off

S5JB0BA204013

Wiring Diagram

[A]

[E]

WHT/BLU

WHT/BLU

WHT/RED

WHT/RED E66-32

E66-26

WHT

RED

WHT

RED

WHT

RED

E91-22
E91-23

WHT

RED

RED

G31-1
G31-3

G31-4

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

G28

[D]

G31

E91

1

2

3

4

7

8

9

10

11

14

15

16
36

34

35

24 23

21

22

28 27

25

26

37

39 38

40

18 17

13 12

19

20

1

2

3

10

11

12

16

17

18

15 14 13

19

20

21

22

23

24

25

26

5

4

7

8

9

6

[G]

E53

[F]

E03

15
16
17
18
19
20
21
22
23
24
25

2
3
4
5
6
7
8
9

10
11
12

1

13

14

26

G31-2

WHT

G28-8

G28-10

1

2

3

WHT

RED

G45-10

G45-9

5

4

6

8

[I]

E03-12

E03-10

E03-6

E03-8

7

[J]

E53-13

E53-42

E53-44

E53-46

[C]

8 7

6 5 4 3

2 1

9

10

11

12

13

14

15

16

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

1

3

7

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

4

6

8

9

10

11

12

13

14

5

E66

[B]

[H]

G45

10 9

3 2 1

9

I5JB0BA20005-01

[A]: BCM connector (viewed from harness side)

1. BCM

[B]: ECM connector (viewed from harness side)

2. 4WD control module (if equipped)

[C]: DLC (viewed from harness side)

3. Combination meter

[D]: Combination meter connector (viewed from harness side)

4. DLC

[E]: 4WD control module connector (viewed from harness side)

5. Junction connector

[F]: ABS control module connector (viewed from terminal side)

6. ECM

[G]: ESP

® control module connector (viewed from terminal side)

7. ESP

® control module

[H]: Steering angle sensor connector (viewed from harness side)

8. ABS control module

[I]: Vehicle not equipped with ESP

®

9. Steering angle sensor

[J]: Vehicle equipped with ESP

®

10B-10 Body Electrical Control System: 

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC and pending DTC.

Troubleshooting

DTC detecting condition

Trouble area

Transmission error that is inconsistent between transmission data 
and transmission monitor (CAN bus monitor) data is detected more 
than 7 times continuously.
(1 driving detection logic)

• CAN circuit
• Combination meter
• BCM
• 4WD control module (if equipped)
• ABS or ESP

® control module

• ECM

Step

Action

Yes

No

1

Check each control unit connectors
1) Check connection of connectors of all control modules 

communicating by means of CAN and reconnect 
securely.

2) Recheck DTC and reconnect securely.

Is DTC U1073 detected?

Go to Step 2.

Intermittent trouble. 
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 00 
in related manual”.

2

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 3.

Repair circuit.

3

Check DTC in BCM
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules 

communicating by means of CAN.

3) Disconnect connector from any one of control modules 

other than BCM.

4) Recheck DTC for BCM.

Is DTC U1073 detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 3) 
one by one and check 
that DTC U1073 is 
detected by BCM each 
time connector is 
disconnected. When 
DTC U1073 is not 
detected by BCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U1073 is detected by 
BCM even when 
connectors of all control 
modules that use CAN 
communication with 
BCM are disconnected, 
substitute a known-
good BCM and recheck.

Check power and 
ground circuit of control 
module disconnect in 
Step 3). If circuit is OK, 
substitute a known-
good control module 
disconnected in Step 3) 
and recheck.