Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJNA
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: LIGHTING (INT): LIGHTING SYSTEM: Door Courtesy Switch Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU detects the condition of the door courtesy light switch.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (COURTESY SWITCH)

(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 / Data List.

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

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FL Door Courtesy

Front door courtesy light switch LH signal/ON or OFF

ON: Front door LH closed

OFF: Front door LH open

-

FR Door Courtesy

Front door courtesy light switch RH signal/ON or OFF

ON: Front door RH closed

OFF: Front door RH open

-

RR Door Courtesy SW

Rear door courtesy light switch RH signal/ON or OFF

ON: Rear door RH open

OFF: Rear door RH closed

-

RL Door Courtesy SW

Rear door courtesy light switch LH signal/ON or OFF

ON: Rear door LH open

OFF: Rear door LH closed

-

Back Door Courtesy SW

Back door Courtesy switch signal/ON or OFF

ON: Back door open

OFF: Back door closed

-

OK:

Normal conditions listed above are displayed.

Result

Result

Proceed to

OK

A

Front door courtesy light switch LH or RH does not operate

B

Rear door courtesy light switch LH or RH does not operate

C

Back door courtesy switch does not operate

D
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (INT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE 2017 - 2020 MY Sienna [08/2016 -        ]; LIGHTING (INT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE )
C

GO TO STEP 5

D

GO TO STEP 7

B

2.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH (LH OR RH)

(a) Remove the front door courtesy light switch (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (INT): FRONT DOOR COURTESY SWITCH: REMOVAL ).

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - Switch body

Pushed

10 kΩ or higher

Not pushed

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Front Door Courtesy Light Switch)

*b

Switch Body

(c) Reinstall the front door courtesy light switch.

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH

OK

3.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - COURTESY LIGHT SWITCH)

(a) for Front LH

(1) Disconnect the 2H instrument panel junction block assembly connector.

(2) Disconnect the K2 front door courtesy light switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2H-34 - K2-1

Always

Below 1 Ω

2H-34 - Body ground

Always

10 kΩ or higher

(4) Reconnect the front door courtesy light switch connector.

(5) Reconnect the instrument panel junction block assembly connector.

(b) for Front RH

(1) Disconnect the 2H instrument panel junction block assembly connector.

(2) Disconnect the L2 front door courtesy light switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2H-36 - L2-1

Always

Below 1 Ω

2H-36 - Body ground

Always

10 kΩ or higher

(4) Reconnect the front door courtesy light switch connector.

(5) Reconnect the instrument panel junction block assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) for Front LH

(1) Remove the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2H-34 - 2I-2 (FLCY)

Always

Below 1 Ω

2H-34 - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Instrument Panel Junction Block)

(3) Reinstall the instrument panel junction block assembly.

(b) for Front RH

(1) Remove the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2H-36 - 2I-4 (FRCY)

Always

Below 1 Ω

2H-36 - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Instrument Panel Junction Block)

(3) Reinstall the instrument panel junction block assembly.
OK

REPLACE MAIN BODY ECU

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

5.

INSPECT REAR DOOR COURTESY LIGHT SWITCH (LH OR RH)

(a) Remove the rear door courtesy light switch (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (INT): REAR DOOR COURTESY SWITCH: REMOVAL ).

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - Switch body

Pushed

10 kΩ or higher

Not pushed

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Rear Door Courtesy Light Switch)

*b

Switch Body

(c) Reinstall the rear door courtesy light switch.

NG

REPLACE REAR DOOR COURTESY LIGHT SWITCH

OK

6.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - COURTESY LIGHT SWITCH)

(a) for Rear LH

(1) Disconnect the D12 main body ECU connector.

(2) Disconnect the K9 rear door courtesy light switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D12-3 (LCTY) - K9-1

Always

Below 1 Ω

D12-3 (LCTY) - Body ground

Always

10 kΩ or higher

(4) Reconnect the rear door courtesy light switch connector.

(5) Reconnect the main body ECU connector.

(b) for Rear RH

(1) Disconnect the D13 main body ECU connector.

(2) Disconnect the L15 rear door courtesy light switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D13-6 (RCTY) - L15-1

Always

Below 1 Ω

D13-6 (RCTY) - Body ground

Always

10 kΩ or higher

(4) Reconnect the rear door courtesy light switch connector.

(5) Reconnect the main body ECU connector.

OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT BACK DOOR LOCK ASSEMBLY

(a) w/o Power Back Door

(1) Remove the back door lock assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: BACK DOOR LOCK: REMOVAL ).

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (ACT-) - 3 (D+)

Locked

10 kΩ or higher

Unlocked

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Back Door Lock Assembly)

*b

Lock

*c

Unlock

(3) Reinstall the back door lock assembly.

(b) w/ Power Back Door

Text in Illustration

*a

Component without harness connected

(Back Door Lock Assembly)

*b

Open-latch

*c

Half-latch

*d

Full-latch

*e

Over-latch

-

-

(1) Remove the back door lock assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: BACK DOOR LOCK: REMOVAL ).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (CTY) - 4 (E)

Open-latch

Below 1 Ω

Half-latch

Below 1 Ω

Full-latch

10 kΩ or higher

Over-latch

10 kΩ or higher

(3) Reinstall the back door lock assembly.

NG

REPLACE BACK DOOR LOCK ASSEMBLY

OK

8.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - MAIN BODY ECU)

(a) w/o Power Back Door

(1) Disconnect the D13 main body ECU connector.

(2) Disconnect the W12 back door lock assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D13-19 (BCTY) - W12-3 (D+)

Always

Below 1 Ω

D13-19 (BCTY) - Body ground

Always

10 kΩ or higher

W12-1 (ACT-) - Body ground

Always

Below 1 Ω

(4) Reconnect the back door lock assembly connector.

(5) Reconnect the main body ECU connector.

(b) w/ Power Back Door

(1) Disconnect the D13 main body ECU connector.

(2) Disconnect the W11 back door lock assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D13-9 (BCTY) - W11-3 (CTY)

Always

Below 1 Ω

D13-9 (BCTY) - Body ground

Always

10 kΩ or higher

W11-4 (E)- Body ground

Always

Below 1 Ω

(4) Reconnect the back door lock assembly connector.

(5) Reconnect the main body ECU connector.

OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR