Suzuki Grand Vitara JB416 / JB420. Manual — part 414

10B-22 Body Electrical Control System:

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.

Step

Action

Yes

No

Body Electrical Control System: 10B-23

DTC U1100 (No. 1100): Lost Communication with ECM

S5JB0AA204015

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

10B-24 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.

Troubleshooting

DTC detecting condition

Trouble area

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

• CAN communication circuit
• BCM
• ECM

Step

Action

Yes

No

1

Check DTC in BCM

Is DTC U1100 (No. 1100) and DTC U1073 (No. 1073)
detected together?

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

Go to Step 2.

2

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

communicating by means of CAN.

2) Recheck BCM for DTC.

Is DTC U1100 (No. 1100) detected?

Go to Step 3.

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

3

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of BCM, ECM and ABS hydraulic

unit/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 5.

Repair circuit.

4

DTC Check
1) Turn ignition switch to OFF position.
2) Connect connectors to BCM, ECM and ABS hydraulic

unit/control module.

3) Check DTC for ABS hydraulic unit/control module.

Is DTC U1100 detected by ABS hydraulic unit/control
module?

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

Substitute a known-
good BCM and recheck.

Body Electrical Control System: 10B-25

DTC U1101 (No. 1101): Lost communication with TCM

S5JB0AA204016

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