Toyota Avalon (XX50): Main Body Ecu

Components

COMPONENTS

ILLUSTRATION

*A	for Gasoline Model	*B	for HV Model
*1	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU	*2	NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY
	N*m (kgf*cm, ft.*lbf): Specified torque	-	-

ILLUSTRATION

*1	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	*2	WIRING HARNESS CLAMP BRACKET
*3	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY	-	-
	N*m (kgf*cm, ft.*lbf): Specified torque	-	-

Installation

INSTALLATION

CAUTION / NOTICE / HINT

NOTICE:

• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

  for Gasoline Model: Click here

  for HV Model: Click here

• After the main body ECU (multiplex network body ECU) has been replaced, the automatic light control system will not operate until the engine is started.

PROCEDURE

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

NOTICE:

• Make sure that the connecting surfaces are free of foreign matter.
• Do not touch the main body ECU (multiplex network body ECU) connector.

(a) Set the main body ECU (multiplex network body ECU) to the position where the guide of the main body ECU (multiplex network body ECU) contacts the housing sidewall of the instrument panel junction block assembly as shown in the illustration.

*a	20° or more
*b	Housing Sidewall
	Set in this Direction

HINT:

Make sure to keep the angle at 20° or more as shown in the illustration.

(b) Slide the main body ECU (multiplex network body ECU) along the housing sidewall as shown in the illustration and engage the 2 guides.

*a	Housing Sidewall
	Slide in this Direction

(c) While keeping the main body ECU (multiplex network body ECU) in contact with side A of the instrument panel junction block assembly (axis of rotation), lower it as shown in the illustration.

*a	Side A
	Install in this Direction

(d) Press the push area until the claw engages to install the main body ECU (multiplex network body ECU).

*1	Instrument Panel Junction Block Assembly
*2	Main Body ECU (Multiplex Network Body ECU)
	Push Area

NOTICE:

• Make sure to press only the push area.
• Confirm the engagement of the main body ECU (multiplex network body ECU) and instrument panel junction block assembly by listening for the click sound of the lock engaging.

HINT:

If a click sound cannot be heard, visually check the engagement of the lock. The engagement can also be confirmed if the main body ECU (multiplex network body ECU) and instrument panel junction block assembly are flush.

2. INSTALL WIRING HARNESS CLAMP BRACKET

(a) Engage the guide.

(b) Install the wiring harness clamp bracket with the nut.

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

3. INSTALL INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU

(a) Connect the 2 connectors and raise the 2 lock levers to engage the 2 claws and lock the connector as shown in the illustration.

NOTICE:

Be sure to connect the connector securely.

Install in this Direction

(b) Engage the clamp.

(c) Engage the clamp.

(d) Engage the claw and guide to install the instrument panel junction block assembly with main body ECU.

Install in this Direction

(e) for Gasoline Model:

(1) Install the 2 nuts.

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

(f) for HV Model:

(1) Install the 2 nuts and bolt.

Torque:

8.0 N·m {82 kgf·cm, 71 in·lbf}

(g) Connect the 2 connectors and raise the 2 lock levers to engage the 2 claws and lock the connector as shown in the illustration.

NOTICE:

Be sure to connect the connector securely.

Install in this Direction

(h) Engage the clamp.

(i) Connect each connector.

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

Click here

5. INSTALL LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

Click here

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.

CAUTION:

Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing.

Click here

CAUTION:

Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing.

Click here

PROCEDURE

1. REMOVE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

Click here

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

Click here

3. REMOVE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU

(a) Disconnect each connector.

*A for HV Model

(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) Disconnect each connector.

(e) for Gasoline Model:

(1) Remove the 2 nuts.

(f) for HV Model:

(1) Remove the 2 nuts and bolt.

	Nut
	Bolt

(g) Disengage the claw, guide and pull out the instrument panel junction block assembly with main body ECU.

Remove in this Direction

(h) Disengage the clamp.

(i) Disengage the clamp.

(j) Disengage the 2 claws and pull down 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

4. REMOVE WIRING HARNESS CLAMP BRACKET

(a) Remove the nut.

(b) Disengage the guide to remove the wiring harness clamp bracket.

5. 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 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.

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

NOTICE:

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