Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000ZY85
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Front Fog Light Circuit; 2017 - 2020 MY Sienna [08/2016 -        ]

Front Fog Light Circuit

DESCRIPTION

The main body ECU controls the front fog light relay.

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 (FRONT FOG LIGHT 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 relay operates.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Front Fog Light Relay

Front fog light relay

ON/OFF

-

OK:

Front fog light relay operates. (Front fog lights come on.)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2017 MY Sienna [08/2016 - 11/2017]; LIGHTING (EXT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE 2018 - 2020 MY Sienna [11/2017 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE )

NG

2.

INSPECT FRONT FOG LIGHT RELAY (FOG FR RELAY)

(a) Remove the front fog light relay.

(b) Inspect the front fog light relay (See page 2017 - 2020 MY Sienna [08/2016 -        ]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION ).

NG

REPLACE FRONT FOG LIGHT RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (BATTERY - FRONT FOG LIGHT RELAY)

(a) Remove the front fog light relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1 - Body ground

Always

11 to 14 V

5 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT 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-38

Always

Below 1 Ω

1 or 2F-38 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

*a

Component without harness connected

(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-38 - 2I-13 (FFGO)

Always

Below 1 Ω

2F-38 or 2I-13 (FFGO) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY