Toyota Tundra Service Manual: Driver Side Door ECU Communication Stop (B2321)

DESCRIPTION

This DTC is output when LIN communication between the front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.

DTC Detection Condition

Trouble Area

B2321

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

  • Front power window regulator motor assembly LH
  • Main body ECU (multiplex network body ECU)
  • Driver side junction block assembly
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Connect the Techstream to the vehicle and turn a courtesy light 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.
  • When the front power window regulator motor assembly (driver side) is removed and reinstalled or replaced, the front power window regulator motor assembly (driver side) must be initialized.

    Click here

HINT:

  • DTC B2325 is output when the communication between all of the following components and main body ECU (multiplex network body ECU) stops.

    Click here

  • When DTC B1206 and B2321 are output simultaneously, perform the troubleshooting for DTC B1206 first.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

DTC B2321 is not output

USE SIMULATION METHOD TO CHECK

DTC B2321 is output

3.

INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

(a) Remove the power window regulator master switch assembly.

Click here

*a

Front view of wire harness connector

(to Multiplex Power Window Regulator Master Switch Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (LIN1) - 7 (LIN2)

Always

Below 1 Ω

NG

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

OK

4.

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

(a) Disconnect the N12 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N2-7 (LIN2) - N12-9 (LIN)

Ignition switch off

Below 1 Ω

N2-7 (LIN2) or N12-9 (LIN) - Body ground

Ignition switch off

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

(b) Disconnect the N12 front power 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

A-16 (LIN2) - N12-9 (LIN)

Always

Below 1 Ω

A-16 (LIN2) - Body ground

Always

10 kΩ or higher

NG

GO TO STEP 9

OK

6.

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

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

*a

Front view of wire harness connector

(to Front Power Window Regulator Motor Assembly LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N12-1 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

N12-2 (B) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Temporarily replace the front power window regulator motor assembly LH with a new or normally functioning one.

Click here

(b) Clear the DTCs.

Click here

NEXT

8.

CHECK FOR DTC

(a) Check for DTCs.

Click here

DTC B2321 is not output

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

DTC B2321 is output

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

9.

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

(b) Disconnect the N12 front power 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

3I-17 - N12-9 (LIN)

Always

Below 1 Ω

3I-17 - Body ground

Always

10 kΩ or higher

OK

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Sliding Roof ECU Communication Stop (B1273)

    Front Passenger Side Door ECU Communication Stop (B2322)

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