Troubleshooting for Lost Communication
Precautions: Precautions for Diagnosing Trouble · General safety (00)
Circuit Diagram
Halogen headlight model / Non-RBS model
LED headlight model / RBS model
| [A]: | 4WD model | 3. | Steering angle sensor | 13. | ENG A-STOP control module |
| [B]: | 2WD model | 4. | DLC | 14. | ESP® control module |
| [C]: | M/T model | 5. | Keyless entry / keyless start control module | 15. | ECM |
| [D]: | Twin clutch system model | 6. | HVAC control module (auto A/C model) | 16. | TCM |
| [E]: | Non-ENG A-STOP model | 7. | 4WD control module | 17. | RBS control module (RBS model) |
| [F]: | ENG A-STOP model | 8. | SDM | 18. | Headlight auto leveling control module (LED headlight model) |
| [a] to [x]: | CAN communication line (linked with diagnosis flows [a] to [x] of “Diagnosis Flow Selection Table”) | 9. | TPMS control module (TPMS model) | 19. | CAN driver |
| [y]: | Connector view | 10. | Select lever | 20. | J/C (G310) |
| 1. | Combination meter | 11. | BCM | 21. | J/C (L346) |
| 2. | P/S control module | 12. | Rain / light sensor (LED headlight model) | 22. | J/C (E346) |
Diagnosis Procedure
NOTE:
•Perform CAN Communication Check:D16AA Model before performing this flow.
•Occurrence of multiple troubles is not included in the scope of this trouble diagnosis.
•Occurrence of multiple troubles is not included in the scope of this trouble diagnosis.
When “Lost Communication” is detected in any control module, perform diagnosis according to the following procedure.
1)Connect SUZUKI scan tool to DLC.
2)Set ignition “ON”.
3)Select “Communication Bus Check” menu of SUZUKI scan tool and check for communication-disabled control module / sensor (it is not displayed).
4)Based on above check results, select applicable diagnosis flow ([a] to [x]) from Diagnosis Flow Selection Table.
5)Perform troubleshooting according to selected diagnosis flow.
Diagnosis Flow Selection Table
NOTE:
•If an individual control module or sensor fails to communicate, check whether power supply circuit or ground circuit of control module or sensor is in good condition, referring to system circuit diagram, etc. before diagnosing trouble with flow chart.
•If it is not possible to select suitable diagnosis flow from “Diagnosis Flow Selection Table” or “two or more diagnosis flows are selectable”, perform Troubleshooting for Communication Bus Off:D16AA Model.
•Diagnosis flows [a] to [x] link with CAN communication lines [a] to [x] of Circuit Diagram.
•If it is not possible to select suitable diagnosis flow from “Diagnosis Flow Selection Table” or “two or more diagnosis flows are selectable”, perform Troubleshooting for Communication Bus Off:D16AA Model.
•Diagnosis flows [a] to [x] link with CAN communication lines [a] to [x] of Circuit Diagram.
| Communication-disabled control module / sensor | Diagnosis flow |
|---|---|
| All control modules communicating by CAN | [a] 
|
| P/S control module, keyless entry / keyless start control module, HVAC control module (auto A/C model), 4WD control module (4WD model), SDM, TPMS control module (TPMS model), select lever (twin clutch system model), BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM (twin clutch system model) | [b]
|
| Keyless entry / keyless start control module, HVAC control module (auto A/C model), 4WD control module (4WD model), SDM, TPMS control module (TPMS model), select lever (twin clutch system model), BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM (twin clutch system model) | [c]
|
|
4WD model 4WD control module, SDM, TPMS control module (TPMS model), select lever (twin clutch system model), BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM (twin clutch system model) |
[d]
|
|
2WD model SDM, TPMS control module (TPMS model), BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module and ECM |
[e]
|
|
4WD model SDM, TPMS control module (TPMS model), select lever (twin clutch system model), BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM (twin clutch system model) |
[f]
|
|
Twin clutch system model Select lever, BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM |
[g]
|
|
M/T model BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module and ECM |
[h]
|
|
Twin clutch system model BCM, rain / light sensor (LED headlight model), headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM |
[i]
|
|
LED headlight model / RBS model Headlight auto leveling control module (LED headlight model), RBS control module (RBS model), ENG A-STOP control module (ENG A-STOP model), ESP® control module, ECM and TCM (twin clutch system model) |
[j]
|
|
RBS model ENG A-STOP control module, ESP® control module, ECM and TCM (twin clutch system model) |
[k]
|
|
Halogen headlight model / Non-RBS model ENG A-STOP control module, ESP® control module and ECM |
[l]
|
|
ENG A-STOP model ESP® control module, ECM and TCM (twin clutch system model) |
[m]
|
|
Non-ENG A-STOP model ESP® control module, ECM and TCM (twin clutch system model) |
[n]
|
| ECM and TCM (twin clutch system model) | [o]
|
| TCM (twin clutch system model) | [p]
|
| Steering angle sensor | [q]
|
| Keyless entry / keyless start control module | [r]
|
| HVAC control module (auto A/C model) | [s]
|
| SDM | [t]
|
| TPMS control module (TPMS model) | [u]
|
| Rain / light sensor (LED headlight model) | [v]
|
| RBS control module (RBS model) | [w]
|
| Headlight auto leveling control module (LED headlight model) | [x]
|
Troubleshooting
Diagnosis flow: [a]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect combination meter connector “G240”.
3)Check for proper connection to DLC and combination meter connector.
4)If connections are OK, check CAN communication circuit [a] between DLC and combination meter connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
Combination meter terminating resistance check
1)Connect combination meter connector.
2)Disconnect P/S control module connector “G50”.
3)Measure resistance between “G211-6” and “G211-14” terminals of DLC.
Is resistance 114 – 134 Ω?
|
Replace combination meter and recheck DTC.
|
Diagnosis flow: [b]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect combination meter connector “G240” and P/S control module connector “G50”.
3)Check for proper connection to combination meter connector and P/S control module connector.
4)If connections are OK, check CAN communication circuit [b] between combination meter connector and P/S control module connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect combination meter connector.
2)Measure resistance between “G50-5” and “G50-6” terminals of P/S control module connector.
Is resistance 114 – 134 Ω?
|
Replace P/S control module and recheck DTC.
|
Replace combination meter and recheck DTC.
|
Diagnosis flow: [c]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect P/S control module connector “G50” and the following connector.
•2WD model: BCM connector “L01”
•4WD model: 4WD control module connector “L14”
3)Check for proper connection to J/C (G310) and P/S control module connector.
4)If connections are OK, check CAN communication circuit [c] between the following connectors for open circuit.
•2WD model: Between P/S control module connector and BCM connector
•4WD model: Between P/S control module connector and 4WD control module connector Is check result OK?
|
Replace P/S control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [d]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect P/S control module connector “G50” and 4WD control module connector “L14”.
3)Check for proper connection to J/C (G310), “G343” connector, “L376” connector and 4WD control module connector.
4)If connections are OK, check CAN communication circuit [d] between P/S control module connector and 4WD control module connector for open circuit.
Is check result OK?
|
Replace 4WD control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [e]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect P/S control module connector “G50” and BCM connector “L01”.
3)Check for proper connection to J/C (G310, L346), “G343” connector, “L376” connector and BCM connector.
4)If connections are OK, check CAN communication circuit [e] between P/S control module connector and BCM connector for open circuit.
Is check result OK?
|
Check for intermittent trouble.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [f]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect 4WD control module connector “L14” and the following connector.
•M/T model: BCM connector “L01”
•Twin clutch system model: Select lever connector “L101”
3)Check for proper connection to J/C (L346) and 4WD control module connector.
4)If connections are OK, check CAN communication circuit [f] between the following connectors for open circuit.
•M/T model: Between 4WD control module connector and BCM connector
•Twin clutch system model: Between 4WD control module connector and select lever connector Is check result OK?
|
Replace 4WD control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [g]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect 4WD control module connector “L14” and select lever connector “L101”.
3)Check for proper connection to J/C (L346) and select lever connector.
4)If connections are OK, check CAN communication circuit [g] between 4WD control module connector and select lever connector for open circuit.
Is check result OK?
|
Replace select lever and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [h]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “L01” and the following connector.
•2WD model: P/S control module connector “G50”
•4WD model: 4WD control module connector “L14”
3)Check for proper connection to J/C (L346) and BCM connector.
4)If connections are OK, check CAN communication circuit [h] between the following connectors for open circuit.
•2WD model: Between BCM connector and P/S control module connector
•4WD model: Between BCM connector and 4WD control module connector Is check result OK?
|
Replace BCM and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [i]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect select lever connector “L101” and BCM connector “L01”.
3)Check for proper connection to select lever connector and BCM connector.
4)If connections are OK, check CAN communication circuit [i] between select lever connector and BCM connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect select lever connector.
2)Measure resistance between “L01-4” and “L01-5” terminals of BCM connector.
Is resistance 114 – 134 Ω?
|
Replace BCM and recheck DTC.
|
Replace select lever and recheck DTC.
|
Diagnosis flow: [j]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and the following connector.
•ENG A-STOP model: ENG A-STOP control module connector “E24”
•Non-ENG A-STOP model: ESP® control module connector “E08”
3)Check for proper connection to J/C (E346) and BCM connector.
4)If connections are OK, check CAN communication circuit [j] between the following connectors for open circuit.
•ENG A-STOP model: Between BCM connector and ENG A-STOP control module connector
•Non-ENG A-STOP model: Between BCM connector and ESP® control module connector Is check result OK?
|
Replace BCM and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [k]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and ENG A-STOP control module connector “E24”.
3)Check for proper connection to J/C (E346) and ENG A-STOP control module connector.
4)If connections are OK, check CAN communication circuit [k] between BCM connector and ENG A-STOP control module connector for open circuit.
Is check result OK?
|
Replace ENG A-STOP control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [l]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and ENG A-STOP control module connector “E24”.
3)Check for proper connection to BCM connector and ENG A-STOP control module connector.
4)If connections are OK, check CAN communication circuit [l] between BCM connector and ENG A-STOP control module connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect BCM connector.
2)Measure resistance between “E24-7” and “E24-20” terminals of ENG A-STOP control module connector.
Is resistance 114 – 134 Ω?
|
Replace ENG A-STOP control module and recheck DTC.
|
Replace BCM and recheck DTC.
|
Diagnosis flow: [m]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect ENG A-STOP control module connector “E24” and ESP® control module connector “E08”.
3)Check for proper connection to ENG A-STOP control module connector and ESP® control module connector.
4)If connections are OK, check CAN communication circuit [m] between ENG A-STOP control module connector and ESP® control module connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect ENG A-STOP control module connector.
2)Measure resistance between “E08-2” and “E08-15” terminals of ESP® control module connector.
Is resistance 114 – 134 Ω?
|
Replace ESP® control module and recheck DTC.
|
Replace ENG A-STOP control module and recheck DTC.
|
Diagnosis flow: [n]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and ESP® control module connector “E08”.
3)Check for proper connection to J/C (E346) and ESP® control module connector.
4)If connections are OK, check CAN communication circuit [n] between BCM connector and ESP® control module connector for open circuit.
Is check result OK?
|
Replace ESP® control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [o]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect ECM connector “E01” and ESP® control module connector “E08”.
3)Check for proper connection to ECM connector and ESP® control module connector.
4)If connections are OK, check CAN communication circuit [o] between ECM connector and ESP® control module connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect ESP® control module connector.
2)Measure resistance between “E01-13” and “E01-14” terminals of ECM connector.
Is resistance 114 – 134 Ω?
|
Replace ECM and recheck DTC.
|
Replace ESP® control module and recheck DTC.
|
Diagnosis flow: [p]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect ECM connector “E01” and TCM connector “E495”.
3)Check for proper connection to ECM connector and TCM connector.
4)If connections are OK, check CAN communication circuit [p] between ECM connector and TCM connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect ECM connector.
2)Disconnect ESP® control module connector “E08”.
3)Measure resistance between “E495-50” and “E495-51” terminals of TCM connector.
Is resistance 114 – 134 Ω?
|
Replace TCM and recheck DTC.
|
Replace ECM and recheck DTC.
|
Diagnosis flow: [q]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect combination meter connector “G240” and steering angle sensor connector “G33”.
3)Check for proper connection to combination meter connector and steering angle sensor connector.
4)If connections are OK, check CAN communication circuit [q] between combination meter connector and steering angle sensor connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect combination meter connector.
2)Disconnect P/S control module connector “G50”.
3)Measure resistance between “G33-2” and “G33-3” terminals of steering angle sensor connector.
Is resistance 114 – 134 Ω?
|
Replace steering angle sensor and recheck DTC.
|
Replace combination meter and recheck DTC.
|
Diagnosis flow: [r]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect P/S control module connector “G50” and keyless entry / keyless start control module connector “G16”.
3)Check for proper connection to J/C (G310) and keyless entry / keyless start control module connector.
4)If connections are OK, check CAN communication circuit [r] between P/S control module connector and keyless entry / keyless start control module connector for open circuit.
Is check result OK?
|
Replace keyless entry / keyless start control module and recheck DTC.
•Ignition switch model:
•Keyless push start model: |
Repair or replace defective wire harness.
|
Diagnosis flow: [s]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect P/S control module connector “G50” and HVAC control module connector “G20”.
3)Check for proper connection to J/C (G310) and HVAC control module connector.
4)If connections are OK, check CAN communication circuit [s] between P/S control module connector and HVAC control module connector for open circuit.
Is check result OK?
|
Replace HVAC control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [t]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect SDM connector “L04” and the following connector.
•M/T model: BCM connector “L01”
•Twin clutch system model: Select lever connector “L101”
3)Check for proper connection to J/C (L346) and SDM connector.
4)If connections are OK, check CAN communication circuit [t] between the following connectors for open circuit.
•M/T model: Between SDM connector and BCM connector
•Twin clutch system model: Between SDM connector and select lever connector Is check result OK?
|
Replace SDM and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [u]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect TPMS control module connector “L306” and the following connector.
•M/T model: BCM connector “L01”
•Twin clutch system model: Select lever connector “L101”
3)Check for proper connection to J/C (L346) and TPMS control module connector.
4)If connections are OK, check CAN communication circuit [u] between the following connectors for open circuit.
•M/T model: Between TPMS control module connector and BCM connector
•Twin clutch system model: Between TPMS control module connector and select lever connector Is check result OK?
|
Replace TPMS control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [v]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “G04” and rain / light sensor connector “K11”.
3)Check for proper connection to BCM connector, “G340” connector, “K156” connector and rain / light sensor connector.
4)If connections are OK, check CAN communication circuit [v] between BCM connector and rain / light sensor connector for open circuit.
Is check result OK?
|
Go to Step 2.
|
Repair or replace defective wire harness.
|
| 2 |
CAN communication circuit resistance check
1)Connect BCM connector.
2)Disconnect ECM connector “E01”.
3)Measure resistance between “K11-1” and “K11-2” terminals of rain / light sensor connector.
Is resistance 114 – 134 Ω?
|
Replace rain / light sensor and recheck DTC.
|
Replace BCM and recheck DTC.
|
Diagnosis flow: [w]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and RBS control module connector “E490”.
3)Check for proper connection to J/C (E346) and RBS control module connector.
4)If connections are OK, check CAN communication circuit [w] between BCM connector and RBS control module connector for open circuit.
Is check result OK?
|
Replace RBS control module and recheck DTC.
|
Repair or replace defective wire harness.
|
Diagnosis flow: [x]
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
CAN communication circuit check
1)Disconnect negative (–) cable at battery.
2)Disconnect BCM connector “E05” and headlight auto leveling control module connector “E18”.
3)Check for proper connection to J/C (E346) and headlight auto leveling control module connector.
4)If connections are OK, check CAN communication circuit [x] between BCM connector and headlight auto leveling control module connector for open circuit.
Is check result OK?
|
Replace headlight auto leveling control module and recheck DTC.
|
Repair or replace defective wire harness.
|