Bus Buffer ECU Communication Stop Mode

NETWORKING: CAN COMMUNICATION SYSTEM: Bus Buffer ECU Communication Stop Mode
- Bus Buffer ECU Communication Stop Mode

DESCRIPTION





* For vehicles with an bus buffer ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

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. PRECAUTION

NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Service Precautions.

NEXT -- Continue to next step.

2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN 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 Repair Instruction - Initialization.

NEXT -- Continue to next step.

3. CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU CAN BRANCH WIRE)

(a) Disconnect the H66 bus buffer ECU connector.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE BUS BUFFER ECU CAN BRANCH WIRE OR CONNECTOR (CAN+, CAN-)

OK -- REPLACE BUS BUFFER ECU