Toyota Venza: Lost Communication with AFS LIN (B124D)

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Lost Communication with AFS LIN (B124D)

DESCRIPTION

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

DTC No.	DTC Detection Condition	Trouble Area
B124D	Malfunction in LIN communication system	Inner rear view mirror assembly Harness or connector AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 (See page ).

(b) Check for DTCs (See page ).

OK:

DTC B124D is not output.

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 P12 inner rear view mirror assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D44-10 (SMR) - P12-3 (LIN)	Always	Below 1 Ω
P12-3 (LIN) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 P12 inner rear view mirror assembly connector.

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)

REPLACE INNER REAR VIEW MIRROR ASSEMBLY

REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

Automatic High Beam Camera (B124C)

DESCRIPTION The DTC is stored when the main body ECU (driver side junction block assembly) detects malfunctions in the camera (inner rear view mirror assembly). DTC No. DTC D ...

Steering Position Sensor Malfunction (B2414)

DESCRIPTION The AFS ECU (headlight swivel ECU assembly) receives signals indicating the swerve-angle from the steering angle sensor using CAN communication. DTC No. DTC Detec ...

Other materials about Toyota Venza:

System Description
SYSTEM DESCRIPTION 1. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM (a) GENERAL DESCRIPTION (1) In the occupant classification system, the occupant classification ECU calculates the weight of the occupant based on signals from the occupant classification ...

Mass Air Flow Circuit Range / Performance Problem (P0101)
DESCRIPTION Refer to DTC P0102 (See page ). DTC No. DTC Detection Condition Trouble Area P0101 All of the following conditions are met (2 trip detection logic): (a) The engine is running. (b ...

Seat Position Airbag Sensor Circuit Malfunction (B1653/35)
DESCRIPTION The seat position airbag sensor circuit consists of the center airbag sensor assembly and seat position airbag sensor. DTC B1653/35 is stored when a malfunction is detected in the seat position airbag sensor circuit. DTC No. ...