Toyota Corolla Cross: 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 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 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 and initialize the headlight ECU sub-assembly LH.

  Click here

• When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.	CHECK LIGHTS

(a) Check the illumination of each clearance lights and daytime running lights.

Result	Proceed to
LH side daytime running light does not illuminate	A
RH side daytime running light does not illuminate	B

B

GO TO STEP 5

A

2.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Headlight Control > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Daytime Running Light	Daytime running lights	OFF or ON	-
Clearance Light (+ Front Side Marker Light)	Parking lights and side marker lights	OFF or ON	-

Body Electrical > Headlight Control > Active Test

Tester Display
Daytime Running Light

Body Electrical > Headlight Control > Active Test

Tester Display
Clearance Light (+ Front Side Marker Light)

OK:

Daytime running lights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

3.	CHECK HEADLIGHT UNIT ASSEMBLY LH

(a) Interchange the headlight unit 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 light and daytime running light.

OK:

The parking lights and daytime running lights operate normally.

OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

5.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Headlight Control > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Daytime Running Light	Daytime running lights	OFF or ON	-
Clearance Light (+ Front Side Marker Light)	Parking lights and side marker lights	OFF or ON	-

Body Electrical > Headlight Control > Active Test

Tester Display
Clearance Light (+ Front Side Marker Light)

Body Electrical > Headlight Control > 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 UNIT ASSEMBLY RH

(a) Interchange the headlight unit assembly RH with LH and connect the connectors.

Click here

NEXT

7.	CHECK OPERATION

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

OK:

The parking lights and daytime running lights operate normally.

OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

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