Toyota Venza: Headlight Solenoid Circuit

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Headlight Solenoid Circuit

DESCRIPTION

for HID Headlight:
When the main body ECU receives a high beam turn on signal, the main body ECU activates the bi-function by controlling the BI-XENON relay. The bi-function increases the upper illumination area of the discharge bulb (low beam) by moving a shade using a solenoid built into the headlight unit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK OPERATION (LOW BEAM HEADLIGHTS)

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

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Head Light Hi	High beam headlight relay	ON/OFF	-

OK:

High beam headlights illuminate.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

3.	INSPECT BI-XENON RELAY (BI-XENON)

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

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω
3 - 5	Battery voltage not applied between terminals	10 kΩ or higher

REPLACE BI-XENON RELAY

4.	CHECK HARNESS AND CONNECTOR (BATTERY - BI-XENON RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Relay terminal 2 - Body ground	Always	11 to 14 V
Relay terminal 5 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (BI-XENON RELAY - HEADLIGHT ASSEMBLY)

(a) Disconnect the A53 headlight assembly LH connector.

(b) Disconnect the A52 headlight assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Relay terminal 3 - A53-4	Always	Below 1 Ω
Relay terminal 3 - A52-4	Always	Below 1 Ω
Relay terminal 3 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (BI-XENON RELAY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the 2C main body ECU (driver side junction block assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Relay terminal 1 - 2C-23	Always	Below 1 Ω
2C-23 - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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