Suzuki Grand Vitara JB627. Service manual - part 418

10B-21 Body Electrical Control System: 

3) Repeat BCM Check Flow Table.

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

S6JB0BA204018

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 E23-9

E23-17

WHT

RED

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

E23

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 24 23 22

26

5

4

6

[I]

E53

[E]

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

1

2

3

4

9

5

6

11

8

7

[K]

E03-12

E03-10

E03-6

E03-8

10

[J]

E53-13

E53-42

E53-44

E53-46

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

34

35

36

37

38

39

40

32

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

[D]

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

[L]

G45

10 9

3 2 1

WHT

RED

7

8

9

G45-9
G45-10

I6JB01A20004-02

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

1. BCM

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

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]: ESP

® control module connector (viewed from terminal side)

9. Junction connector

[J]: Vehicle equipped with ESP

®

10. ESP

® control module

[K]: Vehicle not equipped with ESP

®

11. Steering angle sensor (if equipped)

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

Body Electrical Control System:  10B-22

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.

10B-23 Body Electrical Control System: 

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

S6JB0BA204013

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)

Body Electrical Control System:  10B-24

DTC Troubleshooting

Step

Action

Yes

No

1

Control module connector check
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.

3

DTC check of 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.