Suzuki Grand Vitara JB419. Service manual — part 177

Body Electrical Control System: 10B-11

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

S5JB0BA204014

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

I5JB0BA20005-01

[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

S5JB0BA300001

• 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)

S5JB0BA300004

• 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

S5JB0BA300003

• 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.

I3RH0AA30001-01

1

I3RH0AA30002-01