B1263

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1263: Luggage Room Junction Block ECU Communication Stop

DTC B1263 - Luggage Room Junction Block ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the No.1 junction block assembly (multiplex network rear ECU) and network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (MPX-B, D/C CUT)
(a) Remove the MPX-B and D/C CUT fuses from the engine room relay block No. 1.
(b) Measure the resistance of the fuses.
NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND)




(a) Disconnect the LC and LF junction block connectors.
(b) Measure the resistance and voltage 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 K66 connector.
(b) Disconnect the V3 and LC junction block connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result:






C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE NO. 1 JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
A -- REPLACE NO. 1 JUNCTION BLOCK ASSEMBLY