Lexus NX: Rear Door RH ECU Communication Stop (B2323)

Lexus NX Service Manual / Power Source & Network / Networking / Lin Communication System / 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.

Detection Item

DTC Detection Condition

Trouble Area

B2323

Rear Door RH ECU Communication Stop

No communication between rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Rear power window regulator motor assembly RH
  • 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 procedure.
  • When a power window regulator motor assembly is replaced or removed and reinstalled, it 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 B2323 is not output

USE SIMULATION METHOD TO CHECK

DTC B2323 is output

3.

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

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

Click here

(b) Disconnect the N2 rear power window regulator motor assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-16 (LIN2) - N2-9 (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 (REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH - BATTERY AND BODY GROUND)

*a

Front view of wire harness connector

(to Rear Power Window Regulator Motor Assembly RH)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N2-1 (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

N2-2 (B) - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

(a) Temporarily replace the rear power window regulator motor assembly RH 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 B2323 is not output

END (REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH IS DEFECTIVE)

DTC B2323 is output

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

7.

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

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

Click here

(b) Disconnect the N2 rear power window regulator motor assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4D-41 - N2-9 (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

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