Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Side Marker Light Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System(for Hv Model With Cornering Light) / Front Side Marker Light Circuit

DESCRIPTION

When the light control switch is in the tail or head position, the main body ECU (multiplex network body ECU) sends an illumination request signal to the headlight ECU sub-assembly LH/RH to illuminate the front side marker lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

    Click here

  • If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.

    Click here

PROCEDURE

1.

CHECK LIGHTS

(a) Check the illumination of each front side marker lights.

Result

Proceed to

LH side front side marker light does not illuminate

A

RH side front side marker light does not illuminate

B
B

GO TO STEP 5

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > HL AutoLeveling > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Clearance Light

Parking lights

OFF or ON

-
Body Electrical > HL AutoLeveling > Active Test

Tester Display

Clearance Light

OK:

Front side marker light illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

3.

CHECK HEADLIGHT ASSEMBLY LH

(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors.

Click here

NEXT

4.

CHECK OPERATION (FRONT SIDE MARKER LIGHT)

(a) Check that the front side marker light operates normally.

OK:

Front side marker light operates normally.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE HEADLIGHT ASSEMBLY LH

5.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > HL AutoLeveling (Sub) > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Clearance Light

Parking lights

OFF or ON

-
Body Electrical > HL AutoLeveling (Sub) > Active Test

Tester Display

Clearance Light

OK:

Front side marker light illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

6.

CHECK HEADLIGHT ASSEMBLY RH

(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors.

Click here

NEXT

7.

CHECK OPERATION (FRONT SIDE MARKER LIGHT)

(a) Check that the front side marker light operates normally.

OK:

Front side marker light operates normally.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPLACE HEADLIGHT ASSEMBLY RH

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    Toyota Avalon (XX50) 2019-2022 Owners Manual

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