Lexus NX: Driver Side Door ECU Communication Stop (B2321)

Lexus NX Service Manual / Power Source & Network / Networking / Lin Communication System / Driver Side Door ECU Communication Stop (B2321)

DESCRIPTION

This DTC is stored 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.

Detection Item

DTC Detection Condition

Trouble Area

B2321

Driver Side Door ECU Communication Stop

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

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power 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

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    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

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2321 is not output

USE SIMULATION METHOD TO CHECK

DTC B2321 is output

3.

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 instrument panel junction block assembly.

Click here

(b) Disconnect the M2 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) - M2-9 (LIN)

Always

Below 1 Ω

A-16 (LIN2) - Body ground

Always

10 kΩ or higher

NG

GO TO STEP 7

OK

4.

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

*a

Front view of wire harness connector

(to Front Power Window Regulator Motor Assembly LH)

(a) Disconnect the 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

M2-1 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

M2-2 (B) - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE FRONT 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

Body Electrical > Main Body > Clear DTCs
NEXT

6.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
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)

7.

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

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Disconnect the M2 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

4D-41 - M2-9 (LIN)

Always

Below 1 Ω

4D-41 - Body ground

Always

10 kΩ or higher

OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ NEXT:

 Front Passenger Side Door ECU Communication Stop (B2322)

DESCRIPTION This DTC is output when LIN communication between the front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for 10 seconds or more. DTC No.

 Rear Door RH ECU Communication Stop (B2323)

DESCRIPTION This DTC is output when LIN communication between the rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for 10 seconds or more. DTC No.

 Rear Door LH ECU Communication Stop (B2324)

DESCRIPTION This DTC is output when LIN communication between the rear power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for 10 seconds or more. DTC No.

SEE MORE:

 Removal

REMOVAL PROCEDURE 1. REMOVE FRONT WHEEL Click here 2. REMOVE NO. 1 ENGINE UNDER COVER ASSEMBLY Click here 3. REMOVE REAR ENGINE UNDER COVER LH Click here 4. REMOVE REAR ENGINE UNDER COVER RH Click here 5. DRAIN HYBRID TRANSAXLE FLUID Click here 6. REMOVE FRONT AXLE SHAFT NUT LH Click here

 Power Window Master Switch

ComponentsCOMPONENTS ILLUSTRATION *1 MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY *2 POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WITH FRONT DOOR ARMREST BASE PANEL *3 FRONT DOOR ARMREST BASE PANEL - - RemovalREMOVAL PROCEDURE 1. REMOVE POWER WINDOW REGULATOR MASTER SWITCH ASSE

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