Open in One Side of CAN Branch Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in One Side of CAN Branch Line
- Open in One Side of CAN Branch Line

DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the Techstream's "CAN Bus Check" screen, one side of the CAN branch wire may be open. (One side of the CANH [branch wire] /CANL [branch wire] of the ECU and/or sensor is open.)

*: for 4WD

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. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (BRAKE ACTUATOR)

(a) Disconnect the A19 brake actuator assembly (skid control ECU) connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (YAW RATE SENSOR)
A -- Continue to next step.

2. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (BRAKE ACTUATOR BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BRAKE ACTUATOR)

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Removal

3. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (YAW RATE SENSOR)

(a) Disconnect the K6 yaw rate sensor assembly connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (POWER STEERING ECU)
A -- Continue to next step.

4. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (YAW RATE SENSOR BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (YAW RATE SENSOR)

OK -- REPLACE YAW RATE SENSOR ASSEMBLY Removal

5. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (POWER STEERING ECU)

(a) Disconnect the E18 power steering ECU assembly connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (MAIN BODY ECU)
A -- Continue to next step.

6. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (POWER STEERING ECU BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER STEERING ECU)

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

7. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (MAIN BODY ECU)

(a) Disconnect the E17 main body ECU (driver side junction block) connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (AIR CONDITIONING AMPLIFIER)
A -- Continue to next step.

8. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (MAIN BODY ECU BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU)

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

9. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (AIR CONDITIONING AMPLIFIER)

(a) Disconnect the E37*1 or E36*2 air conditioning amplifier assembly connector.

* *1: for Automatic Air Conditioning System

* *2: for Manual Air Conditioning System

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (STEERING ANGLE SENSOR)
A -- Continue to next step.

10. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

(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.

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

Standard Resistance:

* *1: for Automatic Air Conditioning System

* *2: for Manual Air Conditioning System

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER)

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

11. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (STEERING ANGLE SENSOR)

(a) Disconnect the E11 steering angle sensor connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (4WD CONTROL ECU)
A -- Continue to next step.

12. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (STEERING ANGLE SENSOR BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR)

OK -- REPLACE STEERING ANGLE SENSOR Removal

13. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (4WD CONTROL ECU)

NOTICE:
For vehicles without 4WD, go to "Check for Open in One Side of Branch Wire (Center Airbag Sensor Assembly Branch Wire)".

(a) Disconnect the E57 4WD control ECU assembly connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)
A -- Continue to next step.

14. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (4WD CONTROL ECU BRANCH WIRE)

(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.

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (4WD CONTROL ECU)

OK -- REPLACE 4WD CONTROL ECU ASSEMBLY

15. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

(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.

(b) Disconnect the E45 center airbag sensor assembly connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal