U1100

NETWORKING: CAN COMMUNICATION SYSTEM: U1100: Lost Communication with Seat Belt Control ECU

DTC U1100 - Lost Communication with Seat Belt Control ECU

DESCRIPTION





HINT: For vehicles with the pre-collision system only.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances 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.

NEXT -- Continue to next step.
2. CHECK FOR OPEN IN CAN BUS WIRE (SEAT BELT CONTROL ECU BRANCH WIRE)





(a) Disconnect the E42 seat belt control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE SEAT BELT CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)
(a) Connect the cable to the negative (-) battery terminal.





(b) Disconnect the E41 and E42 seat belt control ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SEAT BELT CONTROL ECU