B1200

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1200: MPX Body ECU Stop
B1200 - MPX Body ECU Stop

DESCRIPTION

* This DTC is detected if communication between the main body ECU RH (cowl side junction block RH) and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
If "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1200, repair the "+B or GND short malfunction of communication bus" DTCs first B1214.

PROCEDURE

1. INSPECT FUSE (FR DOOR RH)

(a) Remove the FR DOOR RH fuse from the main body ECU RH (cowl side junction block RH).

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

Standard Resistance:





NG -- REPLACE FUSE (FR DOOR RH)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY AND BODY GROUND)

(a) Disconnect the RN and RD connectors.





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

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU RH - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the J75 and RJ connectors.





(b) Disconnect the J76 connector.

(c) Disconnect the P33 connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)