B2405

NETWORKING: LIN COMMUNICATION SYSTEM: B2405: Sub Bus LIN Module Communication Malfunction

DTC B2405 - Sub Bus LIN Module Communication Malfunction

DESCRIPTION

This DTC is stored when LIN communication between the No. 2 main body ECU and overhead junction block stops for 10 seconds or more.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
When using the Techstream with the engine switch off to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (NO. 2 MAIN BODY ECU - OVERHEAD JUNCTION BLOCK)





(a) Disconnect the L33 ECU connector.
(b) Disconnect the R12 junction block connector.
(c) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:






Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK OVERHEAD JUNCTION BLOCK (BATTERY VOLTAGE AND GROUND)





(a) Disconnect the R7 junction block connector.
(b) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:






Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK OVERHEAD JUNCTION BLOCK
(a) Temporarily replace the overhead junction block with a new or normally functioning one Disassembly.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.
4. CHECK FOR DTC
(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE NO. 2 MAIN BODY ECU
A -- END (OVERHEAD JUNCTION BLOCK IS DEFECTIVE)