Check CAN Bus Line for Short to +B
NETWORKING: CAN COMMUNICATION SYSTEM: Check CAN Bus Line for Short to +B
- Check CAN Bus Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus main wires and +B when no resistance exists between terminals 6 (CANH) and 16 (BAT) or 14 (CANL) and 16 (BAT) of the DLC3.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
* Turn the power switch off before inspecting CAN bus wires for a ground short.
* After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT
* Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
1. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - CAN NO. 2 J/C)
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the CAN No. 2 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)
OK -- Continue to next step.
2. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - SKID CONTROL ECU)
C -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - CERTIFICATION ECU)
D -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - ECM)
E -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - NAVIGATION ECU)
A -- REPLACE CAN NO. 2 JUNCTION CONNECTOR
3. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)
(a) Disconnect the CAN No. 1 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C)
OK -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 1 J/C)
4. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Result:
Text in Illustration
B -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - POWER STEERING ECU)
C -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - STEERING ANGLE SENSOR)
D -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN NO. 1 J/C - DLC3)
E -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - COMBINATION METER)
A -- Continue to next step.
5. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - MAIN BODY ECU)
C -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)
D -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)
E -- CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - YAW RATE SENSOR)
A -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
6. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - POWER STEERING ECU)
(a) Disconnect the power steering ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C- POWER STEERING ECU)
OK -- REPLACE POWER STEERING ECU Removal
7. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - STEERING ANGLE SENSOR)
(a) Disconnect the steering angle sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - STEERING ANGLE SENSOR)
OK -- REPLACE SPIRAL CABLE WITH STEERING ANGLE SENSOR Removal
8. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - COMBINATION METER)
(a) Disconnect the combination meter connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - COMBINATION METER)
OK -- REPLACE COMBINATION METER Removal
9. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - MAIN BODY ECU)
(a) Disconnect the main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MAIN BODY ECU)
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal
10. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the power management control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
11. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)
(a) Disconnect the center airbag sensor assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal
12. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 1 J/C - YAW RATE SENSOR)
(a) Disconnect the yaw rate sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - YAW RATE SENSOR)
OK -- REPLACE YAW RATE AND ACCELERATION SENSOR Removal
13. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - SKID CONTROL ECU)
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - SKID CONTROL ECU)
OK -- REPLACE SKID CONTROL ECU Removal
14. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - CERTIFICATION ECU)
(a) Disconnect the certification ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CERTIFICATION ECU)
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU) Removal
15. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - ECM)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - ECM)
OK -- REPLACE ECM Removal
16. CHECK FOR SHORT TO +B IN CAN BUS WIRE (CAN NO. 2 J/C - NAVIGATION ECU)
(a) Disconnect the navigation ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
B -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (for HDD) Removal
C -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - NAVIGATION ECU)
A -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (for DVD) Removal