Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 103

 

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Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 103

 

 

10B-14 Body Electrical Control System: 

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

S5JB0EA204015

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

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 TCM (A/T 
model) for longer than specified time 
continuously.

• CAN communication circuit
• BCM
• TCM (A/T model)

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 TCM for DTC.

Is DTC P1774 detected?

Go to “DTC P1774: 
CAN 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 
in related manual”.

4

CAN communication circuit check
1) Disconnect connectors from BCM and TCM.
2) Check CAN communication circuit for open, short and 

high resistance.
• Between TCM and BCM

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.

Body Electrical Control System:  10B-15

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.

Step

Action

Yes

No

10B-16 Body Electrical Control System: 

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

S5JB0EA204016

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

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 data sent by CAN 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 keyless start control module for DTC.

Is DTC No. 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 
in related manual”.

4

CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of BCM and keyless start control 

module communicating by means of CAN.

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 lamp 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 lamp 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.

Body Electrical Control System:  10B-17

7

DTC check of BCM
1) Disconnect connector of any one of control module other 

than BCM.

2) Recheck BCM for DTC.

Is DTC U1144 (No.1144) detected?

Disconnect connectors 
of control modules other 
than the one whose 
connector is 
disconnected in Step 1) 
one by one and check 
that DTC U1144 is 
detected by BCM each 
time connector is 
disconnected. When 
DTC U1144 is not 
detected by BCM while 
checking in this way, go 
to description under 
“NO” below. If DTC 
U1144 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 1). If circuit is OK, 
substitute a known-
good control module 
disconnected in Step 1) 
and recheck.

Step

Action

Yes

No

 

 

 

 

 

 

 

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