Lighting System

LIGHTING (EXT): LIGHTING SYSTEM: B124D, B2432: Lost Communication with AFS LIN

B124D - Lost Communication with AFS LIN
B2432 - Lost Communication with Automatic High Beam Sensor

DESCRIPTION

* DTC B124D is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the LIN communication system.

* DTC B2432 is stored when the AFS ECU (headlight swivel ECU 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 or B2432 is not output.

NG -- CHECK HARNESS AND CONNECTOR (AFS ECU - INNER REAR VIEW MIRROR ASSEMBLY)

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

2. CHECK HARNESS AND CONNECTOR (AFS ECU - INNER REAR VIEW MIRROR ASSEMBLY)

(a) Disconnect the A61 AFS ECU (headlight swivel ECU assembly) connector.

(b) Disconnect the P9 inner rear view mirror assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

(a) Reconnect the A61 AFS ECU (headlight swivel ECU assembly) connector.

(b) Connect an oscilloscope to the P9 inner rear view mirror assembly connector.

OK:

Text in Illustration

NG -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Components

OK -- REPLACE INNER REAR VIEW MIRROR ASSEMBLY Components