Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028DY7
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: Only Back Door cannot be Opened; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

Only Back Door cannot be Opened

DESCRIPTION

The main body ECU (multiplex network body ECU) receives signals from the back door opener switch assembly. Then, the main body ECU (multiplex network body ECU) activates the back door lock motor.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Smart Key System (for Start Function).*

    *: w/ Smart Key System

    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

  • The power door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS (TRUNK LID / BACK DOOR OPEN)

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Trunk Lid / Back Door Open

Back door lock motor

OFF/ON

-

Body Electrical > Main Body > Active Test

Tester Display

Trunk Lid / Back Door Open

OK:

The back door lock assembly with courtesy light switch unlatches when ON is selected.

OK

GO TO SMART KEY SYSTEM (for Entry Function)

NG

2.

INSPECT BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; DOOR LOCK: BACK DOOR LOCK: INSPECTION

NG

REPLACE BACK DOOR LOCK ASSEMBLY WITH COURTESY LIGHT SWITCH

OK

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the V3 back door lock with courtesy light switch assembly connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V3-1 (ACT+) - 8H-32

Always

Below 1 Ω

V3-3 (D+) - 8H-5

Always

Below 1 Ω

V3-2 (ACT-) - Body ground

Always

Below 1 Ω

V3-1 (ACT+) - Body ground

Always

10 kΩ or higher

8H-32 - Body ground

Always

10 kΩ or higher

V3-3 (D+) - Body ground

Always

10 kΩ or higher

8H-5 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT 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) 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-19 (BCTY) - 8H-5

Always

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the 8J power distribution box assembly connectors.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

8J-1 - Body ground

Ignition switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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

NEXT

7.

CHECK BACK DOOR OPEN OPERATION

(a) Check that the back door open function operates.

OK

END

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)