B1207

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1207: Smart ECU Stop

DTC B1207 - Smart ECU Stop

DESCRIPTION
HINT:
This DTC is only output on vehicles equipped with a smart access with push-button start.
- This DTC is detected when communication between the certification ECU and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY AND BODY GROUND)





(a) Disconnect the U28 ECU connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard voltage:






Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
2. CHECK RESISTANCE OF COMMUNICATION LINE





(a) Disconnect the a7, K66, M4 and U28 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result:






C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE CERTIFICATION ECU AND WIRE HARNESS CONNECTOR
A -- REPLACE CERTIFICATION ECU