Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: P/W Master SW System Missing Message (B120687,B127387,B232187-B232487)

Toyota Corolla Cross (2022-2024) Service Manual / Power Source & Network / Networking / Lin Communication System / P/W Master SW System Missing Message (B120687,B127387,B232187-B232487)

DESCRIPTION

This DTC is stored when LIN communication between the main body ECU (multiplex network body ECU) and multiplex network master switch assembly, front power window regulator motor assembly (driver door), front power window regulator motor assembly (front passenger door), rear power window regulator motor assembly (rear RH door), rear power window regulator motor assembly (rear LH door) or sliding roof ECU (sliding roof drive gear sub-assembly)*1 stops for 10 seconds or more.

  • *1: w/ Sliding Roof System

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B120687

P/W Master SW System Missing Message

No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Multiplex network master switch assembly
  • Wire harness or connector

B127387

Sliding Roof System Missing Message

No communication between sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) for 10 seconds or more.*1

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Sliding roof ECU (sliding roof drive gear sub-assembly)

    (w/ Sliding Roof System)

  • Wire harness or connector

B232187

D-Door P/W System Missing Message

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

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Multiplex network master switch assembly
  • Front power window regulator motor assembly (driver door)
  • Wire harness or connector

B232287

P-Door P/W System Missing Message

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

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Front power window regulator motor assembly (front passenger door)
  • Wire harness or connector

B232387

RR-Door P/W System Missing Message

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

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Rear power window regulator motor assembly (rear RH door)
  • Wire harness or connector

B232487

RL-Door P/W System Missing Message

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

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Rear power window regulator motor assembly (rear LH door)
  • Wire harness or connector
  • *1: w/ Sliding Roof System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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 is necessary to perform initialization.

    Click here

  • When the sliding roof ECU (sliding roof drive gear sub-assembly) is replaced or removed and reinstalled, it is necessary to perform initialization.*1

    Click here

    • *1: w/ Sliding Roof System
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
    • for HEV Model: Click here
    • for Gasoline Model: Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

B120687, B127387, B232187, B232287, B232387 and B232487 are not output

A

B120687, B127387, B232187, B232287, B232387 and B232487 are output

B

B120687, B232187, B232287, B232387 and B232487 are output

C

B120687 and B232187 are output

D

Only B120687 is output

E

Only B127387 is output

F

Only B232187 is output

G

Only B232287 is output

H

Only B232387 is output

I

Only B232487 is output

J

A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 4

D

GO TO STEP 6

E

GO TO STEP 7

F

GO TO STEP 8

G

GO TO STEP 11

H

GO TO STEP 14

I

GO TO STEP 16

J

GO TO STEP 18

B

3.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

HINT:

Click here

(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.

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

MB-15 (LIN2) - 8F-17

Always

Below 1 Ω

MB-15 (LIN2) - 8B-37

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

4.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

HINT:

Click here

(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.

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

MB-15 (LIN2) - 8F-17

Always

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

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

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8F-17 - L7-17 (LIN1)

Ignition switch off

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

(a) Disconnect the 8F power distribution box assembly connector.

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

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8F-17 - L7-17 (LIN1)

Ignition switch off

Below 1 Ω

OK

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

L7-11 (B) - L7-12 (GND)

Ignition switch off

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L7-12 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

HINT:

Click here

(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.

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

MB-15 (LIN2) - 8B-37

Always

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

9.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY))

(a) Disconnect the T12 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8B-37 - T12-7 (MPX1)

Ignition switch off

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

T12-1 (B) - T12-2 (E)

Ignition switch off

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T12-2 (E) - Body ground

Always

Below 1 Ω

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Remove the multiplex network master switch assembly.

HINT:

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

16 - 17

Always

Below 1 Ω

*a

Component without harness connected

(Multiplex Network Master Switch Assembly)

NG

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

OK

12.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L7-16 (LIN2) - L2-9 (LIN)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

L2-2 (B) - L2-1 (GND)

Ignition switch off

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L2-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (DRIVER DOOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR))

(a) Disconnect the 8F power distribution box assembly connector.

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

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8F-17 - K2-9 (LIN)

Ignition switch off

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

15.

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

K2-2 (B) - K2-1 (GND)

Ignition switch off

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY (FRONT PASSENGER DOOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR))

(a) Disconnect the 8F power distribution box assembly connector.

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

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8F-17 - M2-9 (LIN)

Ignition switch off

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.

CHECK HARNESS AND CONNECTOR (REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

M2-2 (B) - M2-1 (GND)

Ignition switch off

11 to 14 V

(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

OK

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR RH DOOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

18.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR))

(a) Disconnect the 8F power distribution box assembly connector.

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

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8F-17 - N2-9 (LIN)

Ignition switch off

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

19.

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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

N2-2 (B) - N2-1 (GND)

Ignition switch off

11 to 14 V

(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

OK

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY (REAR LH DOOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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