Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000002787U
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: NETWORKING: LIN COMMUNICATION SYSTEM (for TMC Made): B232588; Door LIN Bus off; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

DTC

B232588

Door LIN Bus off

DESCRIPTION

If the main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 8 seconds or more, DTC B232588 will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B232588

Door LIN Bus off

The main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 8 seconds or more.
  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Multiplex network master switch assembly
  • Power window regulator motor assembly (driver door)
  • Power window regulator motor assembly (front passenger door)
  • Power window regulator motor assembly (rear LH door)
  • Power window regulator motor assembly (rear RH door)
  • Sliding roof ECU (sliding roof drive gear sub-assembly)*
  • Wire harness or connector

Main Body
  • *: w/ Sliding Roof System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When a power window regulator motor assembly is replaced or removed and reinstalled, it is necessary to perform initialization.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; WINDOW / GLASS: POWER WINDOW CONTROL SYSTEM (for TMC Made): REGISTRATION

  • When the sliding roof ECU (sliding roof drive gear sub-assembly) is replaced or removed and reinstalled, it is necessary to perform initialization.*

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SLIDING ROOF / CONVERTIBLE: SLIDING ROOF SYSTEM (for TMC Made): INITIALIZATION

    • *: w/ Sliding Roof System
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*

    for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    for Gasoline Model, except TMMMS Made: Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function (Gasoline Model, except TMMMS Made)): REGISTRATION

    • *: w/ Smart Key System

PROCEDURE

1.

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)

(a) Disconnect the L2 power window regulator motor assembly (driver door) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)

A

2.

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Disconnect the L7 multiplex network master switch assembly connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

GO TO STEP 11

A

3.

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)

(a) Disconnect the K2 power window regulator motor assembly (for front passenger door) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)

A

4.

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)

(a) Disconnect the M2 power window regulator motor assembly (rear RH door) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)

A

5.

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)

(a) Disconnect the N2 power window regulator motor assembly (rear LH door) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)

A

6.

SYSTEM CHECK

(a) Check the vehicle specification.

Result

Proceed to

w/ Sliding Roof System

A

w/o Sliding Roof System

B
B

GO TO STEP 8

A

7.

CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

(a) Disconnect the T29 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) After 10 seconds have elapsed, check if the DTC is output.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B232588 is output

A

DTC B232588 is not output

B
B

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

A

8.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - EACH ECU)

(a) Disconnect the 8H and 8A* power distribution box assembly assembly connector.

  • *: w/ Sliding Roof System

(b) Disconnect all connectors shown in the wiring diagram.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8H-11 - Body ground

Always

10 kΩ or higher

8H-11 - Other terminals

Always

10 kΩ or higher

8A-15 - Body ground*

Always

10 kΩ or higher

8A-15 - Other terminals*

Always

10 kΩ or higher
  • *: w/ Sliding Roof System
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Remove the power distribution box assembly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

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

HINT:

This inspection is to check the LIN communication line in the power distribution box assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Tester Connection

Condition

Specified Condition

8H-11 - 8D-1*1

Always

10 kΩ or higher

8H-11 or 8A-15 - 8D-1*2

Always

10 kΩ or higher

MB-15 (LIN2) - Other terminals

Always

10 kΩ or higher
  • *1: w/o Sliding Roof System
  • *2: w/ Sliding Roof System
NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

10.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

(b) Connect all power distribution box assembly connectors other than 8H and 8A.

*a

Component with harness connected

(Power Distribution Box Assembly)

*b

Waveform

(c) Using a GTS, check the waveform.

HINT:

This inspection is to check the LIN communication line in the power distribution box assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

8H-11 - Body ground

Ignition switch ON

2 V/DIV., 200 ms/DIV.

Pulse generation

(See waveform)

8A-15 - Body ground*

Ignition switch ON

2 V/DIV., 200 ms/DIV.

Pulse generation

(See waveform)
  • *: w/ Sliding Roof System
OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

11.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L7-16 (LIN2) - Body ground

Always

10 kΩ or higher

L7-16 (LIN2) - Other terminals

Always

10 kΩ or higher
OK

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR