Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual — part 111

10E-11 Keyless Start System:

DTC No. 31: Lost Communication with BCM

S5JB0EA504020

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

[L]

[K]

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

I5JB0DA50004-01

[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 (if equipped)

[D]: DLC (viewed from terminal side)

4. Keyless start control module

[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]: Vehicle equipped with ESP

®

11. Steering angle sensor (if equipped)

[L]: Vehicle not equipped with ESP

®

Keyless Start System: 10E-12

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC referring to “DTC Clearance in related manual”.
2) Turn ignition key knob by pushing ignition key knob.
3) Check DTC referring to “DTC Check”.

Troubleshooting

DTC detecting condition

Trouble area

Keyless start control module cannot receive data
sent by CAN from BCM

• CAN communication circuit
• Keyless start control module
• BCM

Step

Action

Yes

No

1

Was “Keyless Start System Check” performed?

Go to Step 2.

Go to “Keyless Start
System Check in related
manual”.

2

DTC check of keyless start control module

Is DTC No. 33 detected?

Go to “DTC No. 33:
Control Module
Communication Bus
Off”.

Go to Step 3.

3

DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section

10B in related manual”

Is DTC U1073, DTC U1100 or DTC U1101 detected?

Go to applicable DTC
diag flow.

Go to Step 4.

4

CAN communication circuit check
1) Check connection of connectors of all control modules

communicating by means of CAN.

2) Disconnect connectors from BCM and keyless start

control module.

3) Check CAN communication circuit between BCM and

keyless start control module 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.

6

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

communicating by means of CAN.

2) Check ECM for DTC.

Is DTC P1678 detected?

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

Go to Step 7.

10E-13 Keyless Start System:

DTC No. 33: Control Module Communication Bus Off

S5JB0EA504021

Wiring Diagram
Refer to “DTC No. 31: Lost Communication with BCM”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC referring to “DTC Clearance in related manual”.
2) Start engine and run it for 1 min. or more.
3) Check DTC referring to “DTC Check”.

7

DTC check of keyless start control module
1) Turn ignition switch to OFF position.
2) Disconnect connector of any one of control module other

than keyless start control module.

3) Recheck keyless start control module for DTC.

Is DTC No.31 detected?

Using same method,
disconnect connectors
of control module other
than keyless start
control module one by
one to check if DTC
No.31 is detected.
If DTC No.31 is
detected even through
connector of control
module other than
keyless start control
module is disconnected,
substitute a known-
good keyless start
control module and
recheck.

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

Step

Action

Yes

No

DTC detecting condition

Trouble area

Communication is not available with all control
modules connected by CAN

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

® control module

• TCM (A/T model)
• ECM
• Steering angle sensor (if equipped)

Keyless Start System: 10E-14

Troubleshooting

Step

Action

Yes

No

1

Was “Keyless Start System Check” performed?

Go to Step 2.

Go to “Keyless Start
System Check in related
manual”.

2

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

communicating by means of CAN.

2) Recheck keyless start control module for DTC.

Is DTC No. 33 detected?

Go to Step 3.

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

3

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 4.

Repair circuit.

4

DTC check of keyless start control module
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules

communicating by means of CAN.

3) Disconnect connector of any one control module other

than keyless start control module and combination
meter.

4) Recheck DTC for keyless start control module.

Is DTC No.33 detected?

Using same method,
disconnect connectors
of control module other
than keyless start
control module and
combination meter one
by one to check if DTC
No.33 is detected.
If DTC No.33 is
detected even though
connector of control
module other than
keyless start control
module and
combination meter is
disconnected, substitute
a known-good keyless
start control module and
recheck.

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