Suzuki Grand Vitara JB419. Manual - part 177

Body Electrical Control System:  10B-11

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

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Wiring Diagram

[A]

[E]

WHT/BLU

WHT/BLU

WHT/RED

WHT/RED E66-32

E66-26

WHT

RED

WHT

RED

WHT

RED

E91-22
E91-23

WHT

RED

RED

G31-1
G31-3

G31-4

1

2

3

4

5

6

7

8

9

10

11

17

1615141312

2221201918

G28

[D]

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

22

23

24

25

26

5

4

7

8

9

6

[G]

E53

[F]

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

G28-8

G28-10

1

2

3

WHT

RED

G45-10

G45-9

5

4

6

8

[I]

E03-12

E03-10

E03-6

E03-8

7

[J]

E53-13

E53-42

E53-44

E53-46

[C]

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

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

[B]

[H]

G45

10 9

3 2 1

9

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

1. BCM

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

2. 4WD control module (if equipped)

[C]: DLC (viewed from harness side)

3. Combination meter

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

4. DLC

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

5. Junction connector

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

6. ECM

[G]: ESP

® control module connector (viewed from terminal side)

7. ESP

® control module

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

8. ABS control module

[I]: Vehicle not equipped with ESP

®

9. Steering angle sensor

[J]: Vehicle equipped with ESP

®

10B-12 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 DTC in ABS or ESP

® control module

Is DTC U1073 detected?

Go to “DTC U1073: 
Control Module 
Communication Bus Off 
in Section 4E”.

Go to Step 3.

3

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 4.

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

4

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

ESP

® control module.

3) Check CAN communication circuit for open, short and 

high resistance.
• Between ECM and ABS or ESP

® control module

• Between BCM and ABS or ESP

® control module

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-13

6

Check DTC in BCM
1) Connect connectors of disconnected control modules 

communicating by means of CAN.

2) Disconnect connector from any one of control modules 

other than BCM.

3) Recheck DTC for BCM.

Is DTC U1100 detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 2) 
one by one and check 
that DTC U1100 is 
detected by BCM each 
time connector is 
disconnected. When 
DTC U1100 is not 
detected by BCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U1100 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 2). If circuit is OK, 
substitute a known-
good control module 
disconnected in Step 2) 
and recheck.

Step

Action

Yes

No

10C-1 Immobilizer Control System: 

Control Systems

Immobilizer Control System

Precautions

Precautions in Diagnosing Troubles

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• Before confirming the diagnostic trouble code (DTC), 

do not disconnect connector from immobilizer control 
module (ICM), battery cable from battery, ground wire 
harness, or main fuse. Such disconnection will erase 
DTC stored in ICM.

• DTC stored in ICM memory can be checked as well 

as cleared by using SUZUKI scan tool. Before using 
SUZUKI scan tool, read its operator’s manual 
carefully to know how to use it and what functions are 
available.

• Be sure to read “Precautions for Electrical Circuit 

Service in Section 00 in related manual” before 
inspection.

• Communication of ECM, BCM, combination meter, 

ABS/ESP

®

 control module, immobilizer control 

module, 4WD control module and steering angle 
sensor (if equipped) is established by CAN (Computer 
Area Network). (For more detail of CAN 
communication, refer to “CAN Communication 
System Description in Section 1A”) Therefore, handle 
CAN communication lines with care referring to 
“Precaution for CAN Communication System in 
Section 00 in related manual”.

Precaution in Replacing Immobilizer Control 
Module (ICM)

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• If ICM is replaced with new or used one without the 

functionality for the immobilizer control system, the 
engine will not be started. In case of the above, check 
if the newly ICM has the functionality for the 
immobilizer control system referring to its part 
number.

• After ICM is replaced with a new one or a used one, 

the engine cannot be started unless the transponder 
code in the transponder which is built in the ignition 
key is registered in ICM and the key verification code 
stored in ICM is registered in the immobilizer control 
system. For the registration procedure, refer to 
“Procedure after Immobilizer Control Module (ICM) 
Replacement”.

Precautions in Handling Immobilizer Control 
System

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• Do not turn ON ignition switch with ignition key in 

contact with another one or quite close to another 
one. Or, the immobilizer control system may detect 
some abnormal condition and prevent the engine from 
starting.

• Do not turn ON ignition switch by using ignition key 

with any type of metal (1) wrapped its grip or in 
contact with it. Or, the immobilizer control system may 
detect some abnormal condition and prevent the 
engine from starting.

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1

I3RH0AA30002-01