Lexus NX manuals

Lexus NX: LIN Communication Bus Malfunction (B2325)

Lexus NX Service Manual / Power Source & Network / Networking / Lin Communication System / LIN Communication Bus Malfunction (B2325)

DESCRIPTION

  • *1: w/ Sliding Roof System
  • *2: w/ Hands Free Power Back Door

The main body ECU (multiplex network body ECU) intermittently monitors the LIN communication bus between the components related to the doors, sliding roof drive gear sub-assembly*1 and kick door control sensor*2. DTC B2325 is stored when a malfunction in the LIN communication bus between the components related to the doors and sliding roof drive gear sub-assembly is detected consecutively 3 times.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2325

LIN Communication Bus Malfunction

Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.
  • Multiplex network master switch assembly
  • Front power window regulator motor assembly LH
  • Front power window regulator motor assembly RH
  • Rear power window regulator motor assembly LH
  • Rear power window regulator motor assembly RH
  • Sliding roof drive gear sub-assembly*1
  • Main body ECU (multiplex network body ECU)
  • Kick door control sensor*2
  • 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.

  • When the power window regulator motor assembly (driver side) is removed and reinstalled or replaced, the power window regulator motor assembly (driver side) must be initialized.

    Click here

  • w/ Sliding Roof System:

    When the sliding roof drive gear sub-assembly is removed and reinstalled or replaced, the sliding roof drive gear sub-assembly 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:

When DTC B2325 and a LIN communication stop DTC are output simultaneously, first perform troubleshooting for DTC B2325. Then perform troubleshooting for the LIN communication stop DTC.

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 B2325 is not output

USE SIMULATION METHOD TO CHECK

DTC B2325 is output

3.

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the M10 multiplex network master switch assembly connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B1206 is output

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

DTC B2325 is output

4.

CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the M2 front power window regulator motor assembly LH connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2321 is output

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

DTC B2325 is output

5.

CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the L2 front power window regulator motor assembly RH connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2322 is output

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

DTC B2325 is output

6.

CHECK REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the O2 rear power window regulator motor assembly LH connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2323 is output

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

DTC B2325 is output

7.

CHECK REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

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

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2324 is output

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

DTC B2325 is output

8.

CHECK SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY

NOTICE:

For vehicle without a sliding loof system, proceed to next step.

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the T9 sliding roof drive gear sub-assembly connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B1273 is output

REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY

DTC B2325 is output

9.

CHECK KICK DOOR CONTROL SENSOR

NOTICE:

For vehicle without a hands free power back door, proceed to next step.

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Disconnect the W9 kick door control sensor connector.

(c) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B2325 is output

REPLACE KICK DOOR CONTROL SENSOR

DTC B2325 is not output

10.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

(a) Disconnect the 4D instrument panel junction block assembly connector.

(b) Disconnect the M10 multiplex network master switch assembly connector.

(c) Disconnect the M2 front power window regulator motor assembly LH connector.

(d) Disconnect the L2 front power window regulator motor assembly RH connector.

(e) Disconnect the O2 rear power window regulator motor assembly LH connector.

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

(g) w/ Sliding Roof System:

(1) Disconnect the T9 sliding roof drive gear sub-assembly connector.

(h) w/ Hands Free Power Door:

(1) Disconnect the W9 kick door control sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M10-17 (LIN1) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - BODY GROUND)

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

Click here

(b) Connect the instrument panel junction block assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-16 (LIN2) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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