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

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000028IR0
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [11/2022 - ]
Title: POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during main body ECU (multiplex network body ECU) removal/installation are shown below.

Necessary Procedure After Parts Removed/Installed/Replaced (for Gasoline Model)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed
*: w/ Smart Key System
Main body ECU (multiplex network body ECU)	ECU configuration	-
Main body ECU (multiplex network body ECU)	Code registration	Wireless Door Lock Control System Smart Key System (for Gasoline Model, Entry Function) Smart Key System (for Gasoline Model, Start Function) Steering lock function*
Power distribution box assembly	ECU configuration	-

NOTICE:

After the ignition switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the ignition switch off, make sure to wait at least 3 minutes before disconnecting the cable from the negative (-) auxiliary battery terminal.
When the cable is disconnected from the negative (-) auxiliary battery terminal and the security lock setting has been enabled, multi-display operations will be disabled upon next startup unless the password is entered. Be sure to check the security lock setting before disconnecting the cable from the negative (-) auxiliary battery terminal. (for Audio and Visual System (for Single Knob Type))

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Learning completes when vehicle is driven

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
1: for GR Model 2: except GR Model
Front Camera System	Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.1 Drive the vehicle straight ahead at 15 km/h (9 mph) or more for 1 second or more.2

Learning completes when vehicle is operated normally

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
*1: for Hatchback
Power Door Lock Control System Back door opener*1	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.

Necessary Procedure After Parts Removed/Installed/Replaced (for HV Model)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function When Necessary Procedures are not Performed
Main body ECU (Multiplex network body ECU)	ECU configuration	-
Main body ECU (Multiplex network body ECU)	Code registration (Smart Key System (for Start Function, HV Model))	Wireless Door Lock Control System (for HV Model) Smart Key System (for Entry Function, HV Model) Smart Key System (for Start Function, HV Model)
Power distribution box assembly	ECU configuration	-

NOTICE:

After the ignition switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the ignition switch off, make sure to wait at least 3 minutes before disconnecting the cable from the negative (-) auxiliary battery terminal.
When the cable is disconnected from the negative (-) auxiliary battery terminal and the security lock setting has been enabled, multi-display operations will be disabled upon next startup unless the password is entered. Be sure to check the security lock setting before disconnecting the cable from the negative (-) auxiliary battery terminal. (for Audio and Visual System (for Single Knob Type))

HINT:

Learning completes when vehicle is driven

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Front Camera System	Drive the vehicle straight ahead at 15 km/h (9 mph) or more for 1 second or more.

PROCEDURE

1. PRECAUTION

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

for M20A-FKS: Click here

for 2ZR-FXE: Click here

for G16E-GTS: Click here

3. REMOVE FRONT DOOR SCUFF PLATE LH

Click here

4. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH

Click here

5. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH

Click here

6. REMOVE NO. 1 INSTRUMENT SIDE PANEL

Click here

7. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

8. DISCONNECT HOOD LOCK CONTROL LEVER SUB-ASSEMBLY

Click here

9. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL

Click here

10. REMOVE NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY

(a) Remove the 2 bolts, nut and No. 3 instrument panel to cowl brace sub-assembly.

	Bolt
	Nut

11. REMOVE POWER DISTRIBUTION BOX ASSEMBLY WITH MAIN BODY ECU

(a) Disconnect each connector.

*A	for CVT
*B	for Manual Transaxle

(b) Disengage the clamp.

Remove in this Direction

(d) Remove the bolt and nut.

*A	for CVT
*B	for Manual Transaxle
	Bolt
	Nut

(e) Disengage the clamp.

(f) Disengage the clamp.

(g) Disengage the clamp.

(h) Disengage the 2 claws and raise the 2 lock levers to disconnect the 2 connectors as shown in the illustration and remove the power distribution box assembly with main body ECU.

Remove in this Direction

12. REMOVE NO. 3 WIRING HARNESS CLAMP BRACKET

(a) Remove the bolt.

*A	for CVT
*B	for Manual Transaxle

(b) Disengage the guide to remove the No. 3 wiring harness clamp bracket.

13. REMOVE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Press the claw of the power distribution box assembly as shown in the illustration to release the lock.

*1	Power Distribution Box Assembly
*2	Main Body ECU (Multiplex Network Body ECU)
	Press in this Direction

(b) With the power distribution box assembly lock released, insert a screwdriver with its tip wrapped with protective tape horizontally between the main body ECU (multiplex network body ECU) and power distribution box assembly.

*a	Protective Tape
	Insert in this Direction
	Remove in this Direction

NOTICE:

Use a screwdriver with a diameter between 5.0 mm (0.197 in.) and 6.3 mm (0.248 in.) and a length of approximately 90 mm (3.54 in.).
Do not insert the screwdriver under the connector socket of the main body ECU (multiplex network body ECU).

(c) Using the screwdriver, carefully raise the main body ECU (multiplex network body ECU) to the position where the connector becomes disconnected.

NOTICE:

Do not twist the screwdriver to raise the main body ECU (multiplex network body ECU).

(d) Raise the main body ECU (multiplex network body ECU) as shown by the arrow (1), and then pull it out as shown by the arrow (2) in the illustration.

	Raise in this Direction (1)
	Remove in this Direction (2)

NOTICE:

Do not touch the main body ECU (multiplex network body ECU) connector.