Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKAC
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: DOOR / HATCH: BACK DOOR CLOSER SYSTEM: B2251; Back Door Closer Switch Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B2251

Back Door Closer Switch Malfunction

DESCRIPTION

The power back door ECU (power back door motor unit) receives signals from the latch switch, sector switch and back door courtesy switch, which are built into the back door lock. Based on these switch signals, the latch position of the back door lock is determined.

DTC No.

DTC Detection Condition

Trouble Area

B2251

While the back door closer is operating, a malfunction is detected in position information from the back door courtesy switch within a specified amount of time.
  • Back door lock assembly
  • Wire harness or connector
  • Power back door ECU (Power back door motor unit)

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BACK DOOR 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 / Back Door / Data List.

(e) Check if the switch functions properly.

Back Door (Power Back Door ECU)

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Courtesy SW

Back door courtesy switch signal / ON or OFF

ON: Back door courtesy switch on

OFF: Back door courtesy switch off

-

OK:

The display is as specified in the normal condition column.

Result

Result

Proceed to

NG

A

OK

B
B

REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)

A

2.

INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY SWITCH)

(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.

Text in Illustration

*1

Drive Gear

-

-

*a

Component without harness connected

(Back Door Lock Assembly)

*b

Release

*c

Close

*d

Over-latch

*e

Full-latch

*f

Half-latch

*g

Open-latch

*h

Back Door Courtesy Switch

*i

ON

*j

OFF

Standard Resistance:

Back Door Courtesy Switch

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
NG

REPLACE BACK DOOR LOCK ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU)

(a) Disconnect the W11 back door lock assembly connector and K14 power back door ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W11-3 (CTY) - K14-20 (FUL)

Always

Below 1 Ω

W11-4 (E) - Body ground

Always

Below 1 Ω

W11-3 (CTY) - Body ground

Always

10 kΩ or higher
OK

REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR