Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000295S3
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: NETWORKING: CXPI COMMUNICATION SYSTEM: B235587,B235787-B235987; Power Distribution Box Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

DTC

B235587

Power Distribution Box Missing Message

DTC

B235787

Wiper Module Missing Message

DTC

B235887

Smart LDM Left Missing Message

DTC

B235987

Smart LDM Right Missing Message

DESCRIPTION

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

  • *: for LED Type Turn Signal Light

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

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
  • Harness or connector

Main Body

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

Main Body

B235887

Smart LDM Left Missing Message

No communication between headlight unit assembly LH and main body ECU (multiplex network body ECU) for 10 seconds or more*

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Headlight unit assembly LH
  • Harness or connector

Main Body

B235987

Smart LDM Right Missing Message

No communication between headlight unit assembly RH and main body ECU (multiplex network body ECU) for 10 seconds or more*

  • Main body ECU (multiplex network body ECU)
  • Power distribution box assembly
  • Headlight unit assembly RH
  • Harness or connector

Main Body

  • *: for LED Type Turn Signal Light

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Do not remove or install the power distribution box assembly with the negative (-) auxiliary battery terminal connected.
  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • If the main body ECU (multiplex network body ECU) is replaced, 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: Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING 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 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

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

DTC B235587 is output

C

DTC B235787 is output

D

DTC B235887* is output

E

DTC B235987* is output

F

DTC is not output

G

B

GO TO STEP 4

C

GO TO STEP 5

D

GO TO STEP 6

E

GO TO STEP 8

F

GO TO STEP 20

G

USE SIMULATION METHOD TO CHECK

A

3.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Remove the power distribution box assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [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) Disconnect the 8F power distribution box assembly connector.

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

Standard Resistance

Tester Connection

Condition

Specified Condition

MB-22 (CXP1) - 8F-9

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 8F power distribution box assembly connector.

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

(d) Disconnect the A133*2 or A171*3 headlight unit assembly RH connector.*1

(e) Disconnect the A131*2 or A170*3 headlight unit assembly LH connector.*1

  • *1: for LED Type Turn Signal Light

    *2: except G16E-GTS

    *3: for G16E-GTS

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-9 - A56-4 (MPX1)

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

8F-9 or A56-4 (MPX1) - 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 (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE AND BODY GROUND)

(a) Disconnect the 8D or 8K power distribution box assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

8K-1 - Body ground

Always*1

Ignition switch off*2

11 to 14 V

  • *1: for Gasoline Model
  • *2: for HEV Model

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8D-1 - Body ground

Always

Below 1 Ω

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

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

(a) Disconnect the A55 windshield wiper relay assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A55-6 (IGWS) - Body ground

Ignition switch ON

11 to 14 V

A55-8 (+B) - Body ground

Ignition switch ON or less than approximately 60 seconds after ignition switch turned off

11 to 14 V

Approximately 60 seconds or more after ignition switch turned off

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A55-3 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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 8F 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) - 8F-9

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A56-4 (MPX1) or 8F-9 - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - POWER SOURCE AND BODY GROUND)

(a) Disconnect the A131*1 or A170*2 headlight unit assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A131-2 (LO) - Body ground*1

Taillight on

9.5 to 14 V

Taillight off

Below 1 V

A170-2 (LO) - Body ground*2

Taillight on

9.5 to 14 V

Taillight off

Below 1 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A131-5 (E) - Body ground*1

Always

Below 1 Ω

A170-5 (E) - Body ground*2

Always

Below 1 Ω

  • *1: except G16E-GTS

    *2: for G16E-GTS

Result

Proceed to

OK

A

NG (except G16E-GTS)

B

NG (for G16E-GTS)

C

B

GO TO STEP 10

C

GO TO STEP 15

A

9.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT 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 8F power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A131-1 (AT1) - 8F-9*1

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A131-1 (AT1) or 8F-9 - Body ground*1

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

A170-1 (AT1) - 8F-9*2

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A170-1 (AT1) or 8F-9 - Body ground*2

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

  • *1: except G16E-GTS

    *2: for G16E-GTS

OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

INSPECT H-LP LH RELAY

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION

NG

REPLACE H-LP LH RELAY

OK

11.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT UNIT ASSEMBLY LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP LH relay) - A131-2 (LO)*1

Always

Below 1 Ω

3 (H-LP LH relay) or A131-2 (LO) - Body ground*1

Always

10 kΩ or higher

3 (H-LP LH relay) - A170-2 (LO)*2

Always

Below 1 Ω

3 (H-LP LH relay) or A170-2 (LO) - Body ground*2

Always

10 kΩ or higher

  • *1: except G16E-GTS

    *2: for G16E-GTS

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP LH RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP LH relay) - Body ground

Always*1

Ignition switch off*2

11 to 14 V

5 (H-LP LH relay) - Body ground

Always*1

Ignition switch off*2

11 to 14 V

  • *1: for Gasoline Model
  • *2: for HEV Model
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (H-LP LH relay) - 8F-3

Always

Below 1 Ω

1 (H-LP LH relay) or 8F-3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

14.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-3 - MB-8 (HRLY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

15.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: INTEGRATION RELAY: REMOVAL

(b) Inspect the No. 1 integration relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION

NG

REPLACE NO. 1 INTEGRATION RELAY

OK

16.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

9B-1 - A170-2 (LO)

Always

Below 1 Ω

9B-1 or A170-2 (LO) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

9A-5 - Body ground

Always*1

Ignition switch off*2

11 to 14 V

  • *1: for Gasoline Model
  • *2: for HV Model
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

18.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

9B-2 - 8F-3

Always

Below 1 Ω

9B-2 or 8F-3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

19.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-3 - MB-8 (HRLY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

20.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - POWER SOURCE)

(a) Disconnect the A133*1 or A171*2 headlight unit assembly RH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A133-2 (LO) - Body ground*1

Taillight on

9.5 to 14 V

Taillight off

Below 1 V

A171-2 (LO) - Body ground*2

Taillight on

9.5 to 14 V

Taillight off

Below 1 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A133-5 (E) - Body ground*1

Always

Below 1 Ω

A171-5 (E) - Body ground*2

Always

Below 1 Ω

  • *1: except G16E-GTS

    *2: for G16E-GTS

Result

Proceed to

OK

A

NG (except G16E-GTS)

B

NG (for G16E-GTS)

C

B

GO TO STEP 22

C

GO TO STEP 27

A

21.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT 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 8F power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A133-1 (AS1) - 8F-9*1

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A133-1 (AS1) or 8F-9 - Body ground*1

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

A171-1 (AS1) - 8F-9*2

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A171-1 (AS1) or 8F-9 - Body ground*2

Cable disconnected from negative (-) auxiliary battery terminal

10 kΩ or higher

  • *1: except G16E-GTS

    *2: for G16E-GTS

OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.

INSPECT H-LP RH RELAY

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION

NG

REPLACE H-LP RH RELAY

OK

23.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP RH relay) - A133-2 (LO)*1

Always

Below 1 Ω

3 (H-LP RH relay) or A133-2 (LO) - Body ground*1

Always

10 kΩ or higher

3 (H-LP RH relay) - A171-2 (LO)*2

Always

Below 1 Ω

3 (H-LP RH relay) or A171-2 (LO) - Body ground*2

Always

10 kΩ or higher

  • *1: except G16E-GTS

    *2: for G16E-GTS

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

24.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP RH RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP RH relay) - Body ground

Ignition switch off

11 to 14 V

5 (H-LP RH relay) - Body ground

Ignition switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

25.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (H-LP RH relay) - 8F-4

Always

Below 1 Ω

1 (H-LP RH relay) or 8F-4 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

26.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-4 - MB-9 (HRY2)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

27.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: INTEGRATION RELAY: REMOVAL

(b) Inspect the No. 1 integration relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION

NG

REPLACE NO. 1 INTEGRATION RELAY

OK

28.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

9A-12 - A171-2 (LO)

Always

Below 1 Ω

9A-12 or A171-2 (LO) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

29.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

9B-8 - Body ground

Always*1

Ignition switch off*2

11 to 14 V

  • *1: for Gasoline Model
  • *2: for HV Model
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

30.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

9A-11 - 8F-4

Always

Below 1 Ω

9A-11 or 8F-4 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

31.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-4 - MB-9 (HRY2)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY