Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Power Distribution Box Missing Message (B235587,B235787-B235987)

Toyota Corolla Cross (2022-2024) Service Manual / Power Source & Network / Networking / Cxpi Communication System / Power Distribution Box Missing Message (B235587,B235787-B235987)

DESCRIPTION

This DTC is stored when CXPI communication between the power distribution box assembly and windshield wiper relay assembly, headlight assembly RH*1, headlight assembly LH*1 or main body ECU (multiplex network body ECU) stops for 10 seconds or more.

  • *1: for LED Type Parking Light without AFS

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B235587

Power Distribution Box Missing Message

No communication between power distribution box 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

B235787

Wiper Module Missing Message

No communication between windshield wiper relay assembly and main body ECU (multiplex network body ECU) for 10 seconds or more
  • Main body ECU (multiplex network body ECU)
  • Windshield wiper relay assembly
  • Harness or connector

B235887

Smart LDM Left Missing Message

No communication between headlight assembly LH and main body ECU (multiplex network body ECU) for 10 seconds or more
  • Main body ECU (multiplex network body ECU)
  • Headlight assembly LH *1
  • Harness or connector

B235987

Smart LDM Right Missing Message

No communication between headlight assembly RH and main body ECU (multiplex network body ECU) for 10 seconds or more
  • Main body ECU (multiplex network body ECU)
  • Headlight assembly RH *1
  • Harness or connector
  • *1: for LED Type Parking Light without AFS

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
    • for HEV Model: Click here
    • for Gasoline Model: Click here
  • When disconnecting and reconnecting the auxiliary battery.

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    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

B235587, B235787, B235887 and B235987 are output

A

B235787, B235887 and B235987 are output

B

Only B235787 is output

C

Only B235887 is output

D

Only B235987 is output

E

DTCs are not output

F
B

GO TO STEP 4

C

GO TO STEP 5

D

GO TO STEP 7

E

GO TO STEP 9

F

USE SIMULATION METHOD TO CHECK

A

3.

CHECK 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) Disconnect the 8E power distribution box assembly connector.

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

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-
Standard Resistance

Tester Connection

Condition

Specified Condition

MB-22 (CXP1) - 8E-5

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the 8E power distribution box assembly connector.

(c) Disconnect the A56 windshield wiper relay assembly connector.

(d) Disconnect the A131 headlight assembly LH connector.*1

(e) Disconnect the A134 headlight assembly RH connector.*1

  • *1: for LED Type Parking Light without AFS

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8E-5 - A56-4 (MPX1)

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

8E-5 - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A56 windshield wiper relay assembly connector.

(d) Disconnect the 8E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A56-4 (MPX1) - 8E-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A56-4 (MPX1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the A55 and A56 windshield wiper relay assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A56-5 (ES) - Body ground

Always

Below 1 Ω

(c) Connect the cable to the negative (-) auxiliary battery terminal.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A55-6 (IGWS) - Body ground

Ignition switch ON

11 to 14 V

A55-8 (+B) - Body ground

Ignition switch ON

11 to 14 V
OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A131 headlight assembly LH connector.

(d) Disconnect the 8E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A131-1 (AT1) - 8E-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A131-1 (AT1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BATTERY AND BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A131-5 (E) - Body ground

Always

Below 1 Ω

(b) Connect the cable to the negative (-) auxiliary battery terminal.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A131-2 (LO) - Body ground

Ignition switch off

11 to 14 V
OK

REPLACE HEADLIGHT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Disconnect the A134 headlight assembly RH connector.

(d) Disconnect the 8E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A134-1 (AS1) - 8E-5

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A134-1 (AS1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BATTERY AND BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A134-5 (E) - Body ground

Always

Below 1 Ω

(b) Connect the cable to the negative (-) auxiliary battery terminal.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A134-2 (LO) - Body ground

Ignition switch off

11 to 14 V
OK

REPLACE HEADLIGHT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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