Suzuki Grand Vitara JB627. Manual - part 419

 

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Suzuki Grand Vitara JB627. Manual - part 419

 

 

10B-25 Body Electrical Control System: 

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

S6JB0BA204014

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.

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

DTC check of 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

DTC check of ECM
1) Check DTC for ECM.

Is DTC U0073 detected?

Go to “DTC U0073: 
Control Module 
Communication Bus Off 
in Section 1A”.

Go to Step 3.

3

DTC check of ABS or ESP

® control module

1) Check DTC for ABS or ESP

® control module.

Is DTC U1073 detected?

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

Go to Step 4.

4

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 U1100 (No. 1100) detected?

Go to Step 5.

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

5

DTC check of ABS or ESP

® control module

1) Check DTC for ABS or ESP

® control module.

Is DTC U1100 detected?

Go to Step 6.

Go to Step 7.

6

CAN communication circuit check
1) Disconnect connectors from ECM and ABS or ESP

® 

control module.

2) Check CAN communication circuit between ECM and 

ABS or ESP

® control module for open, short and high 

resistance.

Is each CAN communication circuit in good condition?

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

Repair circuit.

7

CAN communication circuit check
1) Disconnect connectors from BCM and ABS or ESP

® 

control module.

2) Check CAN communication circuit between BCM and 

ABS or ESP

® control module for open, short and high 

resistance.

Is each CAN communication circuit in good condition?

Go to Step 8.

Repair circuit.

Body Electrical Control System:  10B-26

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

S6JB0BA204015

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.

8

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 7 for open, short and high 
resistance.

Is each CAN communication circuit in good condition?

Go to Step 9.

Repair circuit.

9

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 U1100 (No.1100) 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 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

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

• CAN communication circuit
• BCM
• TCM

10B-27 Body Electrical Control System: 

DTC Troubleshooting

Step

Action

Yes

No

1

DTC check of BCM

Is DTC U1101 (No. 1101) and DTC U1073 (No. 1073) 
detected together?

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

Go to Step 2.

2

DTC check of TCM
1) Check DTC for TCM.

Is DTC U0073 detected?

Go to “DTC U0073: 
Control Module 
Communication Bus Off 
in Section 5A”.

Go to Step 3.

3

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 U1101 (No. 1101) detected?

Go to Step 4.

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

4

CAN communication circuit check
1) Disconnect connectors from BCM and TCM.
2) Check CAN communication circuit between BCM and 

TCM 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 U1101 detected?

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

Go to Step7.

7

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

than BCM.

3) Recheck BCM for DTC.

Is DTC U1101 (No.1101) detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 2) 
one by one and check 
that DTC U1101 is 
detected by BCM each 
time connector is 
disconnected. When 
DTC U1101 is not 
detected by BCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U1101 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.

Body Electrical Control System:  10B-28

DTC U1144 (No. 1144): Lost Communication with Keyless Start Control Module

S6JB0BA204016

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.

DTC Troubleshooting

DTC detecting condition

Trouble area

BCM can not receive CAN data from keyless start control 
module for longer than specified time continuously.

• CAN communication circuit
• Keyless start control module
• BCM

Step

Action

Yes

No

1

DTC check of BCM

Is DTC U1144 (No. 1144) and DTC U1073 (No. 1073) 
detected together?

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

Go to Step 2.

2

DTC check of keyless start control module
1) Check DTC for keyless start control module.

Is DTC 33 detected?

Go to “DTC No. 33: 
Control Module 
Communication Bus Off 
in Section 10E”.

Go to Step 3.

3

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 U1144 (No. 1144) detected?

Go to Step 4.

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

4

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of 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

Key indicator light operation check
1) Connect connectors of disconnected control modules 

communicating by means of CAN.

2) Push ignition knob switch of steering lock unit.

Does key indicator light turn ON?

Go to Step 7.

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

 

 

 

 

 

 

 

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