LIN Communication System

NETWORKING: LIN COMMUNICATION SYSTEM: B124D: Lost Communication with AFS LIN

DTC B124D - Lost Communication with AFS LIN

DESCRIPTION

The DTC is stored when the main body ECU (driver side junction block assembly) detects malfunctions in the LIN communication system.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE: First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE

1. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B124D is not output.

NG -- CHECK HARNESS AND CONNECTOR (AFS ECU - INNER REAR VIEW MIRROR ASSEMBLY)
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK HARNESS AND CONNECTOR (AFS ECU - INNER REAR VIEW MIRROR ASSEMBLY)

(a) Disconnect the D44 AFS ECU (headlight swivel ECU assembly) connector.
(b) Disconnect the P3 inner rear view mirror assembly connector.
(c) 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. INSPECT AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)
(a) Reconnect the D44 AFS ECU (headlight swivel ECU assembly) connector.

(b) Connect an oscilloscope to the P3 inner rear view mirror assembly connector.

Text in Illustration

NG -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)
OK -- REPLACE INNER REAR VIEW MIRROR ASSEMBLY