Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJW8
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: SEAT: REAR POWER SEAT CONTROL SYSTEM: Back Door Courtesy Switch Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

Back Door Courtesy Switch Circuit

DESCRIPTION

The fold seat control ECU receives signals from the back door courtesy switch and detects the state of the back door (open/close). If the ECU does not detect that the back door is open, the seat stowing and return functions are not available.

WIRING DIAGRAM

PROCEDURE

1.

CHECK FOLD SEAT CONTROL ECU (BACK DOOR COURTESY SWITCH SIGNAL)

(a) Remove the fold seat control ECU with its connectors still connected (See page 2016 - 2020 MY Sienna [12/2015 -        ]; SEAT: POWER SEAT CONTROL ECU(for Rear No. 2 Seat): REMOVAL ).

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

Standard Voltage:

LH Side

Tester Connection

Condition

Specified Condition

b2-5 (BDCY) - Body ground

Back door closed

11 to 14 V

Back door open

Below 1 V

RH Side

Tester Connection

Condition

Specified Condition

a2-5 (BDCY) - Body ground

Back door closed

11 to 14 V

Back door open

Below 1 V

Text in Illustration

*a

Component with harness connected

(Fold Seat Control ECU)

*b

LH Side

*c

RH Side

(c) Reinstall the fold seat control ECU.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

(See page 2016 MY Sienna [12/2015 - 08/2016]; SEAT: REAR POWER SEAT CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 - 2020 MY Sienna [08/2016 -        ]; SEAT: REAR POWER SEAT CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE )
NG

2.

CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY SWITCH - BODY GROUND)

(a) Disconnect the W11 back door lock assembly (back door courtesy switch) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W11-4 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Back Door Lock Assembly (Back Door Courtesy Switch))

(c) Reconnect the back door lock assembly (back door courtesy switch) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY SWITCH)

Text in Illustration

*a

Component without harness connected

(Back Door Lock Assembly (Back Door Courtesy Switch))

*b

Open-latch

*c

Half-latch

*d

Full-latch

*e

Over-latch

-

-

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

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

Standard Resistance:

Tester Connection

Switch 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

(c) Reinstall the back door lock assembly.

NG

REPLACE BACK DOOR LOCK ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - BACK DOOR COURTESY SWITCH)

(a) Disconnect the b2 or a2 fold seat control ECU connector.

(b) Disconnect the W11 back door lock assembly (back door courtesy switch) connector.

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

Standard Resistance:

LH Side

Tester Connection

Condition

Specified Condition

b2-5 (BDCY) - W11-3 (CTY)

Always

Below 1 Ω

b2-5 (BDCY) - Body ground

Always

10 kΩ or higher

RH Side

Tester Connection

Condition

Specified Condition

a2-5 (BDCY) - W11-3 (CTY)

Always

Below 1 Ω

a2-5 (BDCY) - Body ground

Always

10 kΩ or higher

(d) Reconnect the back door lock assembly (back door courtesy switch) connector.

(e) Reconnect the fold seat control ECU connector.

OK

REPLACE FOLD SEAT CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR