B1207

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

DTC B1207 - Smart ECU Stop

DESCRIPTION

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 OPERATION
(a) With the key in your possession, push the lock button on the door outside handle (entry lock operation). Check that the key warning light illuminates or starts blinking.
With the key in your possession, touch the inside of the door outside handle (entry unlock operation). Check that the key warning light illuminates or starts blinking.
OK:
Key warning light illuminates or starts blinking.
OK -- CHECK RESISTANCE OF COMMUNICATION LINE
NG -- Continue to next step.

2. CHECK WIRE HARNESS (CERTIFICATION ECU - BODY GROUND)




(a) Disconnect the S11 ECU connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard resistance:






Standard voltage






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. CHECK RESISTANCE OF COMMUNICATION LINE




(a) Disconnect the S11, T4 and T11 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 REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE CERTIFICATION ECU