Toyota Sienna Service Manual: Headlight Relay Circuit

Toyota Sienna Service Manual / Lighting / Lighting system / Diagnostic trouble code chart / Headlight Relay Circuit

DESCRIPTION

The Multiplex network body ECU controls HEAD relay when signal is received from headlight dimmer switch assembly.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.
Select the item below in the ACTIVE TEST and then check that the relay operates

BODY NO. 1:

BODY NO. 1

2 INSPECT HEADLIGHT RELAY

INSPECT HEADLIGHT RELAY

Inspect headlight relay continuity.

Resistance

Resistance

3 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Measure voltage between the terminal as shown in the chart below

Voltage

Voltage

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ignition Switch Circuit

DESCRIPTION The Multiplex network body ECU receives the ACC and IG signals from the ignition switch. WIRING DIAGRAM INSPECTION PROCEDURE 1 READ VALUE OF INTELLIGENT TESTER Connect the in ...

DRL Relay Circuit

DESCRIPTION The Multiplex network body ECU controls the DRL No.2 relay WIRING DIAGRAM INSPECTION PROCEDURE 1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to DLC ...

Other materials:

Removal
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Aluminum wheel precautions
Use only Toyota wheel nuts and wrenches designed for use with your aluminum wheels. When rotating, repairing or changing your tires, check that the wheel nuts are still tight after driving 1000 miles (1600 km). Be careful not to damage the aluminum wheels when using tire chains. Use o ...

Inspection
1. INSPECT FRONT STABILIZER LINK ASSEMBLY LH (a) As shown in the illustration, flip the ball joint stud back and forth 5 times, before installing the nut. (b) Using a torque wrench, turn the nut continuously at a rate of 2 to 4 seconds per 1 turn and take the torque reading on the 5th tur ...