Suzuki Grand Vitara JB627. Manual - part 436

10E-29 Keyless Start System: 

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC referring to “DTC Clearance”.
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”.

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”

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 U0140 detected?

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

Go to Step 7.

Keyless Start System:  10E-30

DTC No. 33: Control Module Communication Bus Off

S6JB0BA504021

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

Troubleshooting

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)

Step

Action

Yes

No

1

Was “Keyless Start System Check” performed?

Go to Step 2.

Go to “Keyless Start 
System Check”.

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”.

10E-31 Keyless Start System: 

DTC No. 51 / No. 52 / No. 53: Driver Side / Passenger Side / Rear End Door Request Switch Failure

S6JB0BA504022

Wiring Diagram

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.

4) Recheck keyless start control module for DTC.

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.

Step

Action

Yes

No

G44

[A]

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

RED/BLK

BLU

YEL/RED

G44-16

G44-36

G44-32

12V

1

2

3

4

I5JB0AA50018-02

[A]: Keyless start control module connector (viewed from harness side)

3. Passenger side door request switch

1. Keyless start control module

4. Rear end door request switch

2. Driver side door request switch

Keyless Start System:  10E-32

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Clear DTC referring to “DTC Clearance”.
2) Push request switch of each door.
3) Check DTC referring to “DTC Check”.

Troubleshooting

DTC detecting condition

Trouble area

DTC No. 51:
Input signal from driver side door request switch remains 
ON, unchanged for 10 minutes or longer.
DTC No. 52:
Input signal from passenger side door request switch 
remains ON, unchanged for 10 minutes or longer.
DTC No. 53:
Input signal from rear end door request switch remains 
ON, unchanged for 10 minutes or longer.

• Driver side door request switch and its circuit
• Passenger side door request switch and its circuit
• Rear end door request switch and its circuit
• Keyless start control module

Step

Action

Yes

No

1

Was “Keyless Start System Check” performed?

Go to Step 2.

Go to “Keyless Start 
System Check”.

2

Request switch check
1) Check related door request switch for function referring 

to “Front Door (Driver and Passenger Side), Rear End 
Door Request Switch Inspection”.

Is each switch in good condition?

Go to Step 3.

Replace request switch.

3

Wire harness check
1) Disconnect connector from keyless start control module.
2) Check for open, short and high resistance in related door 

request switch circuit.

Is each circuit in good condition?

Substitute a known-
good keyless start 
control module and 
recheck.

Repair circuit.