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:

VSC OFF Indicator Light Remains ON
DESCRIPTION The skid control ECU is connected to the combination meter via CAN communication. Pressing the VSC OFF switch turns off traction control and pressing and holding this switch turns off traction and VSC controls. If VSC control is turned off, the ...

Inspection
INSPECTION PROCEDURE 1. INSPECT FRONT OIL PUMP AND GEAR BODY SUB-ASSEMBLY (a) Turn the drive gear with 2 screwdrivers and make sure that it rotates smoothly. NOTICE: Be careful not to damage the oil seal lip. ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the wiper and washer system. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...