Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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