B1280

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1280: Left Side Junction Block ECU Communication Stop
B1280 - Left Side Junction Block ECU Communication Stop

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
If DTC B1214 or B1215 (+B or GND short malfunction of communication bus) is stored at the same time as DTC B1280, perform troubleshooting for DTC B1214 or B1215 first.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - BATTERY AND BODY GROUND)

(a) Disconnect the LD junction block connector.





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

Standard Voltage:





Standard Resistance:





Text in Illustration





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

2. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the Q3, A30, 2F and Q36 connectors.





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

Standard Resistance:





Text in Illustration





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

3. REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

(a) Replace the main body ECU LH (cowl side junction block LH).

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Multiplex Communication System.

(b) Recheck for DTCs.

OK:

DTC B1280 is not output.

NG -- REPLACE GATEWAY ECU Removal

OK -- END (MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) WAS DEFECTIVE)