B1205

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1205: AFS ECU Communication Stop

DTC B1205 - AFS ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the AFS ECU and network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (H-LP LVL)
(a) Remove the H-LP LVL 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 (AFS ECU - BATTERY AND BODY GROUND)




(a) Disconnect the A31 ECU connector.
(b) Measure the voltage and resistance of the wire harness side connector.
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 A31 and D2 ECU connectors.
(b) Remove the front light ECU from the engine room relay block.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE AFS ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE AFS ECU