Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJF3
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: NETWORKING: LIN COMMUNICATION SYSTEM: B2321; Driver Side Door ECU Communication Stop; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B2321

Driver Side Door ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the front power window regulator motor LH and main body ECU stops for 10 seconds or more.

DTC Code

DTC Detection Condition

Trouble Area

B2321

No communication between the front power window regulator motor LH and main body ECU for 10 seconds or more.

  • Front power window regulator motor assembly LH
  • Main body ECU
  • Instrument panel junction block assembly
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the ignition switch off to troubleshoot:

    Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

DTC B2325 is stored when the communication between the front power window regulator motor assembly LH and main body ECU stops.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTC (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

NEXT

2.

CHECK FOR DTC

(a) Recheck for DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B2321 is output

A

DTC B2321 and B1206 are output

B

DTC B2321, B1206 and/or B2325 are output

HINT:

  • When both B1206 and B2321 are output at the same time, troubleshoot B1206 first.
  • When both B1206 and B2325 are output at the same time, troubleshoot B2325 first.
B

GO TO DIAGNOSTIC TROUBLE CODE CHART

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; NETWORKING: LIN COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART )

A

3.

INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Remove the multiplex network master switch assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; WINDOW / GLASS: POWER WINDOW MASTER SWITCH: REMOVAL ).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

16 (LIN2) - 17 (LIN1)

Always

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Multiplex Network Master Switch Assembly)

NG

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Disconnect the H14 multiplex network master switch assembly connector.

(b) Disconnect the H1 front door window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H14-16 (LIN2) - H1-9 (LIN)

Always

Below 1 Ω

H14-16 (LIN2) or H1-9 (LIN) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY LH - BATTERY AND BODY GROUND)

(a) Disconnect the power window regulator motor assembly LH connector.

(b) Measure the resistance and voltage according to the value(s) in the tables below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

H1-1 (GND) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Condition

Specified Condition

H1-2 (B) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Power Window Regulator Motor Assembly LH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Replace the front power window regulator motor assembly LH (See page 2016 - 2020 MY Sienna [12/2015 -        ]; WINDOW / GLASS: POWER WINDOW REGULATOR MOTOR(for Front Door): REMOVAL ).

NEXT

7.

CLEAR DTC

(a) Clear the DTC (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

NEXT

8.

CHECK FOR DTC

(a) Recheck for DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B2321 is not output

A

DTC B2321 is output

B

A

END (FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH WAS DEFECTIVE)

B

REPLACE MAIN BODY ECU