Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Parking Light/Daytime Running Light Circuit

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

DESCRIPTION

Parking light function:
  • When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the headlight ECU sub-assembly LH/RH and illuminates the parking lights.
Daytime running light function:
  • When the operation conditions of the daytime running lights are met, the main body ECU (multiplex network body ECU) sends an illumination request signal to the headlight ECU sub-assembly LH/RH and illuminates the daytime running 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 parking lights and daytime running lights.

Result

Proceed to

LH side parking light and daytime running light does not illuminate

A

RH side parking light and daytime running 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

-

Daytime Running Light

Daytime running lights

OFF or ON

-
Body Electrical > HL AutoLeveling > Active Test

Tester Display

Clearance Light
Body Electrical > HL AutoLeveling > Active Test

Tester Display

Daytime Running Light

OK:

Parking lights and daytime running lights 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 (PARKING LIGHTS AND DAYTIME RUNNING LIGHTS)

(a) Check the operation of the parking lights and daytime running lights.

OK:

The parking lights and daytime running lights operate 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

-

Daytime Running Light

Daytime running lights

OFF or ON

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

Tester Display

Clearance Light
Body Electrical > HL AutoLeveling (Sub) > Active Test

Tester Display

Daytime Running Light

OK:

Parking lights and daytime running lights 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 (PARKING LIGHTS AND DAYTIME RUNNING LIGHTS)

(a) Check the operation of the parking lights and daytime running lights.

OK:

The parking lights and daytime running lights operate normally.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPLACE HEADLIGHT ASSEMBLY RH

    Operation Check

    Parts Location

    See More:

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Seat Heater System(for Gasoline Model): Terminals Of Ecu
    TERMINALS OF ECU CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Disconnect the G35 air conditioning amplifier assembly connector. (b) Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Ter ...

    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

    © 2025 Copyright www.tavalon.net
    0.0268