Toyota Sienna Quiz
Lighting

Headlight Relay Circuit

In this manual: Lighting
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
3steps
~18min
2/5difficulty
Done 0 of 3

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

  1. Connect the intelligent tester to DLC3.
  2. Turn the ignition switch ON and push the intelligent tester main switch ON.
  3. 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
  1. Inspect headlight relay continuity.

Resistance

Resistance

3 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. 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

Test yourself

A quick Toyota Sienna quiz: every answer comes with an explanation and a link to the manual page.