Toyota Venza: Headlight (HI-BEAM) Circuit

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Headlight (HI-BEAM) Circuit

DESCRIPTION

for Halogen Headlight:
The main body ECU (driver side junction block assembly) controls the high beam headlights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HEADLIGHT

(a) Check the operation of low beam headlights.

OK:

Low beam headlights operate normally.

GO TO PROBLEM SYMPTOMS TABLE

2.	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
Head Light (HI)	High beam headlight relay	ON/OFF	-

OK:

Relay operates. (High beam headlights illuminate.)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

3.	CHECK HARNESS AND CONNECTOR (SHORT IN RELAY-DRIVEN CIRCUIT)

HINT:

When a short circuit occurs between the power distributor (engine room junction block assembly) and high beam headlight bulb, a fail-safe function operates to stop the H-LP HI relay operation.

(a) Remove the H-LP HI (RH) fuse from the power distributor (engine room junction block assembly).

(b) Turn the light control switch to the head position and turn the dimmer switch to the high position.

(d) Turn the dimmer switch to the low position.

(e) Install the H-LP HI (RH) fuse and remove the H-LP HI (LH) fuse.

(f) Turn the dimmer switch to the high position.

(g) Check if the high beam headlight RH illuminates.

OK:

Either high beam headlight LH or RH illuminates.

Text in Illustration

*1	Power Distributor (Engine Room Junction Block Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)

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

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

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

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
1D-3 - Battery negative	Always	11 to 14 V
1D-4 - Battery negative	Always	11 to 14 V

Text in Illustration

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

REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

5.	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 2C main body ECU (driver side junction block assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1F-15 - 2C-23	Always	Below 1 Ω
2C-23 - 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 (FUSE - BODY GROUND)

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