Toyota Venza: Daytime Running Light Relay Circuit

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) controls the daytime running lights.

WIRING DIAGRAM

1. for Halogen Headlight

2. for HID Headlight

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) Check that the relay operates.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Daytime Running Light	Daytime running light relay	ON/OFF	-

OK:

Relay operates. (Daytime running lights illuminate.)

Result	Proceed to
OK	A
NG (for Halogen Headlight)	B
NG (for HID Headlight)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 5

2.	CHECK HEADLIGHT

(a) Check the operation of the high beam headlights.

OK:

High beam headlights operate normally.

GO TO PROBLEM SYMPTOMS TABLE

3.	INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

(a) Remove the power distributor (engine room junction block assembly) from the engine room relay block (See page ).

(b) Connect a positive (+) lead from the battery to terminal 1A-1.

(d) Check for pulses according to the value(s) in the table below.

Standard:

Tester Connection	Condition	Specified Condition
1D-3 - Battery negative	Always	Pulse generation
1D-4 - Battery negative	Always	Pulse generation

Text in Illustration

*1	Component without harness connected (Power Distributor (Engine Room Junction Block Assembly))

REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

4.	CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the 1F power distributor (engine room junction block assembly) connector.

(b) Disconnect the D51 main body ECU (driver side junction block assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1F-16 - D51-10 (DRL)	Always	Below 1 Ω
D51-10 (DRL) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Power Distributor (Engine Room Junction Block Assembly))

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

(a) Remove the power distributor (engine room junction block assembly) from the engine room relay block (See page ).

(b) Connect a positive (+) lead from the battery to terminal 1A-1.

(d) Check for pulses according to the value(s) in the table below.

Standard:

Tester Connection	Condition	Specified Condition
1D-3 - Battery negative	Always	Pulse generation
1D-4 - Battery negative	Always	Pulse generation

Text in Illustration

*1	Component without harness connected (Power Distributor (Engine Room Junction Block Assembly))

REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

6.	CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the 1F power distributor (engine room junction block assembly) connector.

(b) Disconnect the D51 main body ECU (driver side junction block assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1F-15 - D51-10 (DRL)	Always	Below 1 Ω
D51-10 (DRL) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Power Distributor (Engine Room Junction Block Assembly))

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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