Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKHJ
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Headlight Relay Circuit; 2016 MY Sienna [12/2015 - 08/2016]

Headlight Relay Circuit

DESCRIPTION

The main body ECU controls the integration relay*1 or headlight relay*2.

  • *1: w/o HID Headlight System
  • *2: w/ HID Headlight System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Check that the relays operate.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Headlight Relay

Low beam headlight relay

ON/OFF

-

OK:

Relays operates. (Low beam headlights illuminate.)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

SYSTEM CHECK

(a) Check the vehicle specifications.

Result

Result

Proceed to

w/o HID Headlight System

A

w/ HID Headlight System

B

B

GO TO STEP 8

A

3.

REPLACE INTEGRATION RELAY

(a) Temporarily replace the integration relay with a new or normally functioning one.

NEXT

4.

PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Check that the relays operate.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Headlight Relay

Low beam headlight relay

ON/OFF

-

OK:

Headlight relays operate. (Low beam headlights illuminate.)

OK

END (INTEGRATION RELAY WAS DEFECTIVE)

NG

5.

CHECK HARNESS AND CONNECTOR (BATTERY - INTEGRATION RELAY)

(a) Disconnect the integration relay connector.

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

Standard Voltage:

Tester Connector

Condition

Specified Condition

1D-7 (BATT) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Integration Relay)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 1C integration relay connector.

(b) Disconnect the 2F instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1C-9 (HL4) - 2F-25

Always

Below 1 Ω

1C-9 (HL4) or 2F-25 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2F-25 - 2I-15 (HRLY)

Always

Below 1 Ω

2F-25 or 2I-15 (HRLY) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

OK

REPLACE MAIN BODY ECU

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

8.

INSPECT HEADLIGHT RELAY (H-LP RELAY)

(a) Remove the headlight relay.

(b) Inspect the headlight relay (See page 2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION ).

NG

REPLACE HEADLIGHT RELAY

OK

9.

CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY)

(a) Remove the headlight relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 - Body ground

Always

11 to 14 V

5 - Body ground

Always

11 to 14 V

Text in Illustration

*a

Engine Room Relay Block

*b

Headlight Relay Holder

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 2F instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2F-25

Always

Below 1 Ω

1 or 2F-25 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2F-25 - 2I-15 (HRLY)

Always

Below 1 Ω

2F-25 or 2I-15 (HRLY) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

OK

REPLACE MAIN BODY ECU

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY