Toyota Prius: Main Body Ecu

• Removal
• Installation

Removal

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
Main body ECU (multiplex network body ECU)	ECU configuration	-
	Code registration	Wireless Door Lock Control System Smart Key System (for Entry function) Smart Key System (for Start function) Hybrid control system cannot be started Digital Key System

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

Click here

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.

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	PRECAUTION	-		-	-
2	DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL	-	-	-	-
3	FRONT DOOR SCUFF PLATE LH	67914	-	-	-
4	COWL SIDE TRIM BOARD LH	62112	-	-	-
5	NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	55606	-	-	-
6	LOWER CENTER INSTRUMENT PANEL FINISH PANEL	55434B	-	-	-
7	FRONT DOOR OPENING TRIM WEATHERSTRIP LH	62312B	-	-	-
8	INSTRUMENT SIDE PANEL LH	55318C	-	-	-
9	LOWER INSTRUMENT PANEL FINISH PANEL ASSEMBLY	55480D	-	-	-
10	LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY	73900		-	-
11	INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY	55410C		-	-
12	NO. 1 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY	55011A	-	-	-
13	NO. 2 KNEE PROTECTOR BRACKET	55462C	-	-	-
14	NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY	55308B	-	-	-
15	JUNCTION BLOCK BRACKET WITH POWER DISTRIBUTION BOX ASSEMBLY	-		-	-
16	POWER DISTRIBUTION BOX ASSEMBLY	82730G	-	-	-
17	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	89221		-	-

*A	w/o Knee Airbag	*B	w/ Knee Airbag
*1	JUNCTION BLOCK BRACKET	-	-

PROCEDURE

1. PRECAUTION

NOTICE: Do not remove the main body ECU (multiplex network body ECU) except when replacing it. When removing the main body ECU (multiplex network body ECU), always replace it with a new one.

2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

(a) for M20A-FXS:

Click here

(b) for 2ZR-FXE:

Click here

3. REMOVE FRONT DOOR SCUFF PLATE LH

Click here

4. REMOVE COWL SIDE TRIM BOARD LH

Click here

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

Click here

6. REMOVE LOWER CENTER INSTRUMENT PANEL FINISH PANEL

Click here

7. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH

Click here

8. REMOVE INSTRUMENT SIDE PANEL LH

Click here

9. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL ASSEMBLY

Click here

10. REMOVE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (w/ Knee Airbag)

Click here

11. REMOVE INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY

Click here

12. REMOVE NO. 1 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY

Click here

13. REMOVE NO. 2 KNEE PROTECTOR BRACKET

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

Bolt

Nut

15. REMOVE JUNCTION BLOCK BRACKET WITH POWER DISTRIBUTION BOX ASSEMBLY

NOTICE: When disconnecting a wire harness of any component connected to the supply power of the integrated capacitor (integration control supply) or when removing the integrated capacitor (integration control supply), make sure to wait 5 minutes or more after turning the ignition switch off for self-diagnosis to complete and the voltage of the integrated capacitor (integration control supply) to discharge.

*a	Protective Tape	-	-
	Remove in this Direction		Connector
	Nut		Bolt

(1) Using a thin-bladed screwdriver with its tip wrapped with protective tape, disengage the 2 claws and disconnect the 2 lever connectors.

(2) Disconnect the 8 connectors.

(3) Disengage the 2 clamps.

(4) As shown in the illustration, disengage the clamp and claw and disconnect the connector holder.

(5) Remove the bolt and 2 nuts.

(6) Disengage the 2 clamps.

(7) Using a thin-bladed screwdriver with its tip wrapped with protective tape, disengage the 2 claws, disconnect the 2 lever connectors, and remove the junction block bracket with power distribution box assembly.

16. REMOVE POWER DISTRIBUTION BOX ASSEMBLY

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

*1	POWER DISTRIBUTION BOX	*2	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*a	Internal Connector	*b	Protective Tape
	Push in this Direction		Insert in this Direction
	Rotate in this Direction		Remove in this Direction

(1) Remove the main body ECU (multiplex network body ECU) using the following procedure.

1. Press the lock of the power distribution box and release the lock of the main body ECU (multiplex network body ECU) as shown in the illustration.

2. While pressing the lock, horizontally insert a thin-bladed screwdriver with its tip wrapped with protective tape between the main body ECU (multiplex network body ECU) and power distribution box (near the internal connector).

3. When the thin-bladed screwdriver with its tip wrapped with protective tape is inserted, the internal connector lock is released.

NOTICE:

Replace the power distribution box when the connector terminal, the locking section, or the case is damaged or deformed.

4. Hold the rib of the main body ECU (multiplex network body ECU).

5. While rotating the main body ECU (multiplex network body ECU), completely release the lock.

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

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	PRECAUTION	-		-	-
2	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	89221		-	-
3	POWER DISTRIBUTION BOX ASSEMBLY	82730G	-	-	-
4	JUNCTION BLOCK BRACKET WITH POWER DISTRIBUTION BOX ASSEMBLY	-		-	-
5	NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY	55308B	-	-	-
6	NO. 2 KNEE PROTECTOR BRACKET	55462C	-	-	-
7	NO. 1 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY	55011A	-	-	-
8	INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY	55410C	-	-	-
9	LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY	73900		-	-
10	LOWER INSTRUMENT PANEL FINISH PANEL ASSEMBLY	55480D	-	-	-
11	INSTRUMENT SIDE PANEL LH	55318C	-	-	-
12	FRONT DOOR OPENING TRIM WEATHERSTRIP LH	62312B	-	-	-
13	LOWER CENTER INSTRUMENT PANEL FINISH PANEL	55434B	-	-	-
14	NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	55606	-	-	-
15	COWL SIDE TRIM BOARD LH	62112	-	-	-
16	FRONT DOOR SCUFF PLATE LH	67914	-	-	-
17	CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL	-	-	-	-
18	ECU CODE REGISTRATION	-	-	-
19	PERFORM INITIALIZATION	-	-	-
20	INITIALIZATION AFTER RECONNECTING BATTERY TERMINAL	-	-	-

*A	w/o Knee Airbag	*B	w/ Knee Airbag
*1	JUNCTION BLOCK BRACKET	-	-
	Tightening torque for "Major areas involving basic Toyota Prius vehicle performance such as moving/turning/stopping": N*m (kgf*cm, ft.*lbf)		N*m (kgf*cm, ft.*lbf): Specified torque

CAUTION / NOTICE / HINT

PROCEDURE

1. PRECAUTION

NOTICE: When installing the main body ECU (multiplex network body ECU), always replace it with a new one. Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

2. INSTALL MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NOTICE: Do not touch the connector. Make sure foreign matter does not enter the terminals.

*a

Internal Connector

-

-

(1) Hold the main body ECU (multiplex network body ECU) with your dominant hand.

(2) Hold the power distribution box with your other hand.

NOTICE:

Make sure there is no foreign matter in the fitting surface.

*a	20° or more	-	-
	Housing Sidewall		Slide in this Direction

(1) Set the guide of the main body ECU (multiplex network body ECU) against the housing sidewall.

HINT:

Make sure the angle between the power distribution box and the main body ECU (multiplex network body ECU) is 20° or more.

(2) Slide the guide of the main body ECU (multiplex network body ECU) along the housing sidewall in the direction indicated by the arrow.

*a	Center of Rotation	-	-
	Side A		Install in this Direction

(1) Slide the main body ECU (multiplex network body ECU) until it contacts side A.

NOTICE:

Do not allow side A to contact the main body ECU (multiplex network body ECU) too hard

(2) Pressing the main body ECU (multiplex network body ECU) against side A (center of rotation) of the power distribution box.

(3) Rotate it until it enters the lock of the power distribution box.

HINT:

The center of rotation is the one that contacts side A.

*1	Main body ECU (multiplex network body ECU)	*2	ECU Integration Box LH
*a	Press the center of the main body ECU (multiplex network body ECU) with one hand.	*b	Press the 2 sides of the main body ECU (multiplex network body ECU) with both hands.
	Install in this Direction		Pressing Area
	Place fingers or the palm of your hand here	-	-

(1) Check the engagement of the main body ECU (multiplex network body ECU) and the power distribution box by the locking sound.

(2) Press the pressing area of the main body ECU (multiplex network body ECU).

NOTICE:

Do not hit on or put your weight on the main body ECU (multiplex network body ECU) when engaging the main body ECU (multiplex network body ECU).

(3) Press it in one of the following ways.

(1) Check that the back side of the main body ECU (multiplex network body ECU) and the rib surrounding the power distribution box are the same height.

3. INSTALL POWER DISTRIBUTION BOX ASSEMBLY

4. INSTALL JUNCTION BLOCK BRACKET WITH POWER DISTRIBUTION BOX ASSEMBLY

	Install in this Direction		Connector
	Nut		Bolt

(1) As shown in the illustration, engage the 2 claws and 2 lever connectors.

NOTICE:

Make sure that the claws of the lever connectors are securely engaged.

(2) Engage the 2 clamps.

(3) Install the junction block bracket with power distribution box assembly with the bolt and 2 nuts.

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

(4) As shown in the illustration, engage the clamp and claw and connect the connector holder.

(5) Engage the 2 clamps.

(6) Connect the 8 connectors.

(7) As shown in the illustration, engage the 2 claws and 2 lever connectors.

NOTICE:

Make sure that the claws of the lever connectors are securely engaged.

5. INSTALL NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY

Torque:

Bolt :

15 N·m {153 kgf·cm, 11 ft·lbf}

Nut :

6.0 N·m {61 kgf·cm, 53 in·lbf}

6. INSTALL NO. 2 KNEE PROTECTOR BRACKET

Torque:

15 N·m {153 kgf·cm, 11 ft·lbf}

7. INSTALL NO. 1 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY

8. INSTALL INSTRUMENT CLUSTER FINISH PANEL ASSEMBLY

9. INSTALL LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (w/ Knee Airbag)

10. INSTALL LOWER INSTRUMENT PANEL FINISH PANEL ASSEMBLY

11. INSTALL INSTRUMENT SIDE PANEL LH

12. CONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP

13. INSTALL LOWER CENTER INSTRUMENT PANEL FINISH PANEL

14. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

15. INSTALL COWL SIDE TRIM BOARD LH

16. INSTALL FRONT DOOR SCUFF PLATE LH

17. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL

(a) for M20A-FXS:

Click here

(b) for 2ZR-FXE:

Click here

18. ECU CODE REGISTRATION

(a) If the main body ECU (multiplex network body ECU) has been replaced, perform ECU configuration.

Click here

19. PERFORM INITIALIZATION

Click here

20. INITIALIZATION AFTER RECONNECTING AUXILIARY BATTERY TERMINAL

HINT:

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

Click here