Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKI7
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Turn Signal Switch Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

Turn Signal Switch Circuit

DESCRIPTION

The combination meter assembly receives the headlight dimmer switch assembly (turn signal switch) information and controls the turn signal lights.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (TURN SIGNAL SWITCH (RIGHT) AND TURN SIGNAL SWITCH (LEFT))

(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 / Combination Meter / Data List.

(e) According to the display on the Techstream, read the Data List.

Combination Meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Turn Signal Switch (Right)

Turn signal switch (Right) signal/ON or OFF

ON: Turn signal switch (Right) on

OFF: Turn signal switch (Right) off

-

Turn Signal Switch (Left)

Turn signal switch (Left) signal/ON or OFF

ON: Turn signal switch (Left) on

OFF: Turn signal switch (Left) off

-

OK:

Normal conditions listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE 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 HEADLIGHT DIMMER SWITCH ASSEMBLY (TURN SIGNAL SWITCH)

(a) Remove the headlight dimmer switch assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): HEADLIGHT DIMMER SWITCH: REMOVAL ).

(b) Inspect the headlight dimmer switch assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): HEADLIGHT DIMMER SWITCH: INSPECTION ).

NG

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCHASSEMBLY - COMBINATION METER ASSEMBLY AND BODY GROUND)

(a) Disconnect the D147 headlight dimmer switch assembly connector.

(b) Disconnect the D146 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D147-13 (TR) - D146-9 (ER)

Always

Below 1 Ω

D147-15 (TL) - D146-10 (EL)

Always

Below 1 Ω

D147-12 (ED) - Body ground

Always

Below 1 Ω

D147-13 (TR) or D146-9 (ER) - Body ground

Always

10 kΩ or higher

D147-15 (TL) or D146-10 (EL) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE 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

REPAIR OR REPLACE HARNESS OR CONNECTOR