Suzuki Grand Vitara JB416 / JB420. Manual - part 413

10B-18 Body Electrical Control System: 

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.

DTC Troubleshooting

DTC detecting condition

Possible 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

Step

Action

Yes

No

1

Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Disconnect connector from SDM referring to “SDM 

Removal and Installation in Section 8B”.

3) Disconnect connector from BCM.
4) Turn ignition switch to ON position.
5) Measure voltage between “G47-22” or “G46-15” terminal 

of SDM connector and vehicle body ground.

Is voltage 0 V?

Go to Step 2.

Short to power supply in 
air bag communication 
circuit.

2

Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Connect connectors to BCM.
3) Turn ignition switch to ON position.
4) Measure voltage between “G30-19” terminal of BCM 

connector and vehicle body ground.

Is voltage 4 – 6 V?

Go to Step 3.

Short to ground in air 
bag communication 
circuit. If OK, substitute 
a known-good BCM and 
recheck.

3

Check air bag communication circuit
1) Measure voltage between “G47-22” or “G46-15” terminal 

of SDM connector and vehicle body ground.

Is voltage 4 – 6 V?

Substitute a known-
good SDM and recheck.

Open or high resistance 
in air bag 
communication circuit.

Body Electrical Control System:  10B-19

DTC B1157 (No. 1157): Air Bag Deployment Signal Input

S5JB0AA204011

Wiring Diagram

DTC Detecting Condition and Possible cause

Flow Test Description
Step 1: Check DTC for SDM.

DTC troubleshooting

DTC B1170 (No. 1170): EEPROM access error

S5JB0AA204012

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.

7

8

9

10

11

12

13

14

15

6

5

4

3

2

1

G32

24

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

G30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

G31

YEL

5V

G30-19

[A]: G47-22
[B]: G46-15

[A]

[B]

2

1

G47

G46

I5JB0AA20009-02

[A]: Vehicle not equipped with side-air bag

1. SDM

[B]: Vehicle equipped with side-air bag

2. BCM

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

1

Check DTC for SDM
1) Check DTC stored in SDM referring to “DTC Check in 

Section 8B”.

Is DTC B1021 detected?

Go to “DTC B1021: Air 
Bag Module Deployed 
in Section 8B”.

Substitute a known-
good BCM and recheck.

DTC detecting condition

Possible cause

Data write error or check sum error.

BCM malfunction

10B-20 Body Electrical Control System: 

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

S5JB0AA204014

Wiring Diagram

WHT

RED

WHT

RED

G44-18

G44-19

G44

[A]

[B]

[C]

[H]

[G]

1

2

3

4

5

6

7

8

9

10

11

14

15

16
36

34 33 32

30 29

24 23

37

18

19

20

G28-8

G28-10

WHT/BLU

WHT/BLU

WHT/RED

WHT/RED E23-4

E23-19

WHT

RED E03-12

E03-10

E03-6

E03-8

WHT

RED

E92-17

E92-7

WHT

RED

E91-22
E91-23

WHT

RED

RED

G31-1
G31-3

G31-4

6

5

16 15 14 13 12 11

4 3

24 23

21

22

10 9

8

7

2

1

19

20

18 17

E92

2 1

E23

3

4

18

19

5

6

7

10

11

17

20

47 46

49

50

51

21

22

52

16

25

9

24

14

29

55

57

5453

59

60

58

26

27

28

15
30

56

48

32 31

34

35

36

37

40

42

3938

44

45

43

41

33

12

13

23

8

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

G28

[F]

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

25

26

5

6

[E]

[D]

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

8 7 6 5 4 3 2 1

9

10

11

12

13

14

15

16

G31-2

WHT

1

2

3

4

9

5

6

7

8

I5JB0AA50017-03

[A]: Keyless start control module connector (viewed from harness side)

1. Keyless start control module

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

2. TCM (A/T model)

[C]: TCM connector (viewed from harness side)

3. 4WD control module (if equipped)

[D]: DLC (viewed from harness side)

4. BCM

[E]: ABS hydraulic unit/control module connector (viewed from harness side)

5. DLC

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

6. ECM

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

7. ABS hydraulic unit/control module

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

8. Combination meter
9. Junction connector

Body Electrical Control System:  10B-21

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 hydraulic unit/control module
• TCM (A/T model)
• Keyless start control module (if equipped)
• 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”.

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.