B1207

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

HINT
When "+B or GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1207, repair the "+B or GND short malfunction of communication bus" DTCs first.

PROCEDURE

1. INSPECT FUSE (SECURITY)

(a) Remove the SECURITY fuse from the cowl side J/B LH.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

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

(a) Disconnect the P33 ECU connector.





(b) Measure the voltage and resistance of the wire harness side connector.

Standard voltage:





Standard resistance:





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

3. CHECK RESISTANCE OF COMMUNICATION LINE

(a) Disconnect the P33, RJ and M17 ECU connectors.





(b) Measure the resistance between the specified terminals on the wire harness side connectors.

Standard resistance:





Result:





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE CERTIFICATION ECU

A -- REPLACE CERTIFICATION ECU