Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 530

10B-21 Body Electrical Control System: 

DTC Troubleshooting

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

S6JB0AA204011

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 Error

S6JB0AA204012

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.

Step

Action

Yes

No

1

Air bag communication circuit check
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) Check air bag communication circuit for open, short and 

high resistance.

Is circuit in good condition?

Go to Step 2.

Repair circuit.

2

Air bag communication circuit check
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?

Substitute a known-
good SDM and recheck.

Substitute a known-
good BCM and recheck.

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

Body Electrical Control System:  10B-22

DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module

S6JB0AA204018

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

E53-13

E53-42

E53-44

E53-46

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

11

WHT

RED

G45-9
G45-10

10

[M]

[L]

E03-12

E03-10

E03-6

E03-8

[J]

E53

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

[I]

G45

10 9

3 2 1

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

[K]

**E66-32

**E66-26

I6JB0AA20006-01

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

1. BCM

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

2. 4WD control module (if equipped)

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

3. TCM (A/T model)

[D]: DLC (viewed from terminal side)

4. Keyless start control module (if equipped)

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

5. DLC

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

6. ECM

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

7. ABS control module

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

8. Combination meter

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

9. Junction connector

[J]: ESP

® control module connector (viewed from terminal side)

10. ESP

® control module

[K]: ECM connector (viewed from terminal side) (diesel engine model)

11. Steering angle sensor (if equipped)

[L]: ESP

® model

*: Petrol engine model

[M]: Other than ESP

® model

**: Diesel engine model

10B-23 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.

DTC Troubleshooting

DTC detecting condition

Trouble area

BCM can not receive CAN data from 
combination meter for longer than specified 
time continuously.

• CAN communication circuit
• BCM
• Combination meter

Step

Action

Yes

No

1

DTC check of BCM

Is DTC U0155 (No. 0155) and DTC U1073 (No. 1073) 
detected together?

Go to “DTC U1073 (No. 
1073): Control Module 
Communication Bus 
Off”.

Go to Step 2.

2

Control module connector check
1) Check connection of connectors of all control modules 

communicating by means of CAN.

2) Recheck BCM for DTC.

Is DTC U0155 (No. 0155) detected?

Go to Step 3.

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

3

Combination meter power and ground circuit check
1) Turn ignition switch to ON position.

Do warning lights in combination meter other than key 
indicator light light up?

Go to Step 4.

Check combination 
meter power and 
ground circuit. If circuit 
is OK, substitute a 
known-good 
combination meter and 
recheck.

4

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from BCM and combination 

meter.

3) Check CAN communication circuit between BCM and 

combination meter for open, short and high resistance.

Is each CAN communication circuit in good condition?

Go to Step 5.

Repair circuit.

5

CAN communication circuit check
1) Disconnect connectors of all control modules 

communicating by means of CAN.

2) Check CAN communication circuit between control 

modules other than Step 4 for open, short and high 
resistance.

Is each CAN communication circuit in good condition?

Go to Step 6.

Repair circuit.

Body Electrical Control System:  10B-24

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

S6JB0AA204013

Wiring Diagram
Refer to “DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module”.

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.

6

DTC check of BCM
1) Connect connectors of disconnected control modules 

communicating by means of CAN.

2) Disconnect connector of any one of control module other 

than BCM.

3) Recheck BCM for DTC.

Is DTC U0155 (No.0155) detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 2) 
one by one and check 
that DTC U0155 is 
detected by BCM each 
time connector is 
disconnected. When 
DTC U0155 is not 
detected by BCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U0155 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 disconnected in 
Step 2). If circuit is OK, 
substitute a known-
good control module 
disconnected in Step 2) 
and recheck.

Step

Action

Yes

No

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

® control module

• TCM (A/T model)
• Keyless start control module (if equipped)
• ECM
• Steering angle sensor (if equipped)