Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 546

10C-45 Immobilizer Control System: For Diesel Engine Model

DTC B1709: ECM Communication Error 2

S6JB0AA324026

Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: For Diesel Engine Model”.

Detecting Condition and Trouble Area

NOTE
When DTC B1702 and B1709 are detected at the same time, CAN communication circuit may be faulty. 
Check if DTC related to CAN failure is detected by ECM, BCM, keyless start control module (keyless 
start model), 4WD control module and/or ABS/ESP

®

 control module. If it is detected, perform 

applicable DTC diag. flow.

 

Troubleshooting

7

ICM power and ground circuit check
1) Check power and ground circuit of ICM referring to 

“Inspection of Immobilizer Control Module (ICM) and Its 
Circuit: For Diesel Engine Model”.

Is power and ground circuit of ICM normal?

Substitute a known-
good ICM and recheck. 
If DTC B1708 is still 
detected, substitute a 
known-good ECM and 
recheck.

Repair power and 
ground circuit.

Step

Action

Yes

No

Detecting Condition

Trouble Area

Communication error for OBD between ICM and ECM

• CAN communication circuit
• Steering angle sensor (ESP

®

 model)

• 4WD control module
• Keyless start control module (if equipped)
• ABS/ESP

®

 control module

• Combination meter
• BCM
• ICM
• ECM

Step

Action

Yes

No

1

Was “Immobilizer Control System Check” performed?

Go to Step 2.

Go to “Immobilizer 
Control System Check: 
For Diesel Engine 
Model”.

2

Diagnostic Trouble Code (DTC) Check
1) Check ECM for DTC referring to “DTC Check: For Diesel 

Engine Model in Section 1A”.

2) Check ABS control module or ESP

®

 control module for 

DTC. For ESP

®

 model, refer to “DTC Check in Section 

4F”. For non-ESP

®

 model, refer to “DTC Check in 

Section 4E”.

3) Check BCM for DTC referring to “DTC Check in Section 

10B”.

Is any DTC(s) detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Fuse check
1) Check if any fuse is blown.

Is any fuse blown?

Replace blown fuse(s). Go to Step 4.

Immobilizer Control System: For Diesel Engine Model 10C-46

DTC B1711: ECM EEPROM Error

S6JB0AA324027

Detecting Condition and Trouble Area

Troubleshooting

1) Clear DTC(s) referring to “Diagnostic Trouble Code (DTC) Clearance: For Diesel Engine Model”.
2) Turn the ignition switch to OFF position.
3) Check if DTC B1711 is still detected referring to “Diagnostic Trouble Code (DTC) Check: For Diesel Engine 

Model”. If still detected, go to the next step. If not, the troubleshooting is completed.

4) Substitute a known-good ECM and recheck.

4

ICM connector check
1) With the ignition key at OFF position, disconnect ICM 

connector.

2) Check for proper connection at terminals and wires of 

ICM connector. Refer to “Intermittent and Poor 
Connection Inspection in Section 00”.

Is each terminal and wire connection normal?

Go to Step 5.

Repair poor 
connection(s).

5

ECM poor connection check
1) With the ignition key at OFF position, disconnect ECM 

connectors.

2) Check for proper connection at terminals and wires of 

ECM connectors. Refer to “Intermittent and Poor 
Connection Inspection in Section 00”.

Is each terminal and wire connection normal?

Go to Step 6.

Repair poor 
connection(s).

6

CAN communication circuit check
1) Check CAN communication circuit between ICM and 

ECM for open, short and high resistance. Refer to 
“Electrical Circuit Inspection Procedure in Section 00”.

Is each CAN communication circuit in good condition?

Go to step 7.

Repair circuit.

7

ICM check
1) Check power and ground circuit of ICM referring to 

“Inspection of Immobilizer Control Module (ICM) and Its 
Circuit: For Diesel Engine Model”.

Is power and ground circuit of ICM normal?

Substitute a known-
good ICM and recheck. 
If DTC B1709 is still 
detected, substitute a 
known-good ECM and 
recheck.

Repair power and 
ground circuit of ICM.

Step

Action

Yes

No

Detecting Condition

Trouble Area

EEPROM in ECM faulty

Internal failure (EEPROM corruption) of ECM

10C-47 Immobilizer Control System: For Diesel Engine Model

DTC B1712: Immobilizer Communication Error

S6JB0AA324028

Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: For Diesel Engine Model”.

Detecting Condition and Trouble Area

NOTE
Troubleshoot DTC B1703 first if both B1703 and B1712 are detected at the same time.

 

Troubleshooting

Detecting Condition

Trouble Area

Communication error between ICM and ECM

• Related fuse(s) blown
• ICM power and ground circuit
• ECM power and ground circuit
• CAN communication circuit
• Steering angle sensor (ESP

®

 model)

• 4WD control module
• Keyless start control module (if equipped)
• ABS/ESP

®

 control module

• Combination meter
• BCM
• ICM
• ECM

Step

Action

Yes

No

1

Was “Immobilizer Control System Check” performed?

Go to Step 2.

Go to “Immobilizer 
Control System Check: 
For Diesel Engine 
Model”.

2

DTC check
1) Check ICM for DTC referring to “Diagnostic Trouble 

Code (DTC) Check: For Diesel Engine Model”.

Is any DTC detected other than B1712?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Diagnostic Trouble Code (DTC) Check
1) Check ECM for DTC referring to “DTC Check: For Diesel 

Engine Model in Section 1A”.

2) Check ABS control module or ESP

®

 control module for 

DTC. For ESP

®

 model, refer to “DTC Check in Section 

4F”. For non-ESP

®

 model, refer to “DTC Check in 

Section 4E”.

3) Check BCM for DTC referring to “DTC Check in Section 

10B”.

Is any DTC(s) detected?

Go to applicable DTC 
diag. flow.

Go to Step 4.

4

Fuse check
1) Check if any fuse is blown.

Is any fuse blown?

Replace blown fuse(s). Go to Step 5.

Immobilizer Control System: For Diesel Engine Model 10C-48

5

ICM connector check
1) With the ignition key at OFF position, disconnect ICM 

connector.

2) Check for proper connection at terminals and wires of 

ICM connector. Refer to “Intermittent and Poor 
Connection Inspection in Section 00”.

Is each terminal and wire connection normal?

Go to Step 6.

Repair poor 
connection(s).

6

ECM connector check 
1) With the ignition key at OFF position, disconnect ECM 

connectors.

2) Check for proper connection at terminals and wires of 

ECM connectors. Refer to “Intermittent and Poor 
Connection Inspection in Section 00”.

Is each terminal and wire connection normal?

Go to Step 7.

Repair poor 
connection(s).

7

CAN communication circuit check
1) Check CAN communication circuit between ICM and 

ECM for open, short and high resistance. Refer to 
“Electrical Circuit Inspection Procedure in Section 00”.

Is each CAN communication circuit in good condition?

Go to Step 8.

Repair circuit.

8

ICM power and ground circuit check
1) Check power and ground circuit of ICM referring to 

“Inspection of Immobilizer Control Module (ICM) and Its 
Circuit: For Diesel Engine Model”.

Is power and ground circuit of ICM normal?

Substitute a known-
good ICM and recheck. 
If DTC B1702 is still 
detected, substitute a 
known-good ECM and 
recheck.

Repair power and 
ground circuit.

Step

Action

Yes

No