Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001CXIQ
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL; 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]

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

Replaced Part or Performed Procedure

Necessary Procedure

Effect/Inoperative Function when Necessary Procedure not Performed

Link

Disconnect cable from negative battery terminal

Perform steering sensor zero point calibration

Lane Control System

2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; PRE-COLLISION: PRE-COLLISION SYSTEM (for Gasoline Model): INITIALIZATION

Pre-collision System

Lighting System (w/ AFS)(EXT)

Initialize back door lock

Power Door Lock Control System

2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM (for Hatchback, Gasoline Model): INITIALIZATION

Main body ECU (multiplex network body ECU)

Code registration (Smart Key System (for Start Function))
  • Wireless Door Lock Control System
  • Smart Key System (for Entry Function)
  • Smart Key System (for Start Function)
  • Steering lock function

2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

NOTICE:

  • After the engine switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Audio and Visual System)
  • After the engine switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Navigation System)

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 BATTERY TERMINAL

Click here 2019 MY Corolla Corolla Hatchback [06/2018 - 01/2019]; MAINTENANCE: M20A-FKS BATTERY: REMOVAL+

3. REMOVE FRONT DOOR SCUFF PLATE LH

Click here 2019 - 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 06/2020]; INTERIOR PANELS / TRIM: ROOF HEADLINING (for Hatchback): REMOVAL+

4. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH

Click here 2019 - 2021 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 06/2020]; INTERIOR PANELS / TRIM: ROOF HEADLINING (for Hatchback): REMOVAL+

5. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; INTERIOR PANELS / TRIM: INSTRUMENT PANEL SAFETY PAD: REMOVAL+

6. REMOVE NO. 1 INSTRUMENT SIDE PANEL

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; INTERIOR PANELS / TRIM: INSTRUMENT PANEL SAFETY PAD: REMOVAL+

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

Click here 2019 MY Corolla Corolla Hatchback Corolla HV [06/2018 - 01/2019]; INTERIOR PANELS / TRIM: FRONT CONSOLE BOX (except G16E-GTS): REMOVAL+

8. DISCONNECT HOOD LOCK CONTROL LEVER SUB-ASSEMBLY

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; INTERIOR PANELS / TRIM: INSTRUMENT PANEL SAFETY PAD: REMOVAL+

9. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; INTERIOR PANELS / TRIM: INSTRUMENT PANEL SAFETY PAD: REMOVAL+

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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU

(a) Disconnect each connector.

*A

for CVT

*B

for Manual Transaxle

(b) Disengage the clamp.

(c) Disengage the 2 claws and pull down the 2 lock levers to disconnect the 2 connectors as shown in the illustration.

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 instrument panel junction block 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 instrument panel junction block assembly as shown in the illustration to release the lock.

*1

Instrument Panel Junction Block Assembly

*2

Main Body ECU (Multiplex Network Body ECU)

Press in this Direction

(b) With the instrument panel junction block assembly lock released, insert a screwdriver with its tip wrapped with protective tape horizontally between the main body ECU (multiplex network body ECU) and instrument panel junction block 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.