B2326

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: B2326: CAN MS Bus Line Communication Malfunction
B2326 - CAN MS Bus Line Communication Malfunction

DESCRIPTION

HINT
For vehicles with the smart key system only.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
- Turn the ignition switch off before measuring the resistance of the main wire and the branch wire.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder buzzer are not in operation.
- Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistance of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

NEXT -- Continue to next step.

2. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Result

C -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

B -- CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - ECU AGGREGATION BOX)
A -- Continue to next step.

3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 CAN JUNCTION CONNECTOR - COMBINATION METER ECU)

(a) Disconnect the E69 No. 4 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 CAN JUNCTION CONNECTOR - MAIN BODY ECU)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE NO. 4 JUNCTION CONNECTOR

5. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector connector.

NEXT -- Continue to next step.

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ECU - NO. 4 JUNCTION CONNECTOR)

(a) Disconnect the E19 combination meter assembly (combination meter ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ECU (COMBINATION METER ECU - NO. 4 JUNCTION CONNECTOR)

OK -- REPLACE COMBINATION METER ASSEMBLY (COMBINATION METER ECU) Removal

7. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector connector.

NEXT -- Continue to next step.

8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU - NO. 4 JUNCTION CONNECTOR)

(a) Disconnect the E16 main body ECU (driver side junction block) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 4 JUNCTION CONNECTOR)

OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - ECU AGGREGATION BOX)

(a) Disconnect the E69 No. 4 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Result

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU)

(a) Measure the resistance according to the value(s) in the table below.

Result

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - COMBINATION METER)

(a) Measure the resistance according to the value(s) in the table below.

Result

NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 4 JUNCTION CONNECTOR

12. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector connector.

NEXT -- Continue to next step.

13. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECU AGGREGATION BOX)

(a) Disconnect the E84 ECU aggregation box assembly (certification ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Result

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ECU AGGREGATION BOX ASSEMBLY (CANH, CANL)

OK -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU)

14. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector connector.

NEXT -- Continue to next step.

15. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU)

(a) Disconnect the E16 main body ECU (driver side junction block) connector.

(b) Measure the resistance according to the value(s) in the table below.

Result

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CANP, CANN)

OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

16. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector connector.

NEXT -- Continue to next step.

17. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER)

(a) Disconnect the E19 combination meter assembly (combination meter ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Result

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO COMBINATION METER ASSEMBLY (MSCL, MSCH)

OK -- REPLACE COMBINATION METER ASSEMBLY (COMBINATION METER ECU) Removal

18. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

(b) Disconnect the IE and E16 main body ECU (driver side junction block) connectors.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)