B1283

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1283: Driver Side Junction Block ECU Communication Stop

DTC B1283 - Driver Side Junction Block ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the driver side junction block ECU and network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (MPX-B3)
(a) Remove the MPX-B3 fuse from the passenger side junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
2. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK ECU - BATTERY AND BODY GROUND))




(a) Disconnect the 2G junction block connector.
(b) Disconnect the D4 ECU connector.
(c) Measure the voltage and resistance of the wire harness side connectors.
Standard voltage:






Standard resistance:






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




(a) Disconnect the D2, D4, T8 and A31 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE DRIVER SIDE JUNCTION BLOCK AND REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE DRIVER SIDE JUNCTION BLOCK