Lost Communication with AFS LIN (B124D)

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

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.

1. CHECK FOR DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

OK:

DTC B124D is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

1. 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 P12 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

1. INSPECT AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

(a) Reconnect the D44 AFS ECU (headlight swivel ECU assembly) connector.

(b) Connect an oscilloscope to the P12 inner rear view mirror assembly connector.

(c) Check the waveform. OK: Tester Connection Tool Setting Condition Specified Condition P12-3 (LIN) - P12-2 (E) 2 V/DIV., 20 ms./DIV. Ignition switch ON Correct waveform is as shown Text in Illustration *1 Front view of wire harness connector (to Inner Rear View Mirror Assembly)

OK

REPLACE INNER REAR VIEW MIRROR ASSEMBLY

NG

REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)