Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: D-Seat ECU Vehicle Information Reading/Writing Process Malfunction (B15F8)

DESCRIPTION

This DTC is stored when items controlled by the main body ECU (multiplex network body ECU) cannot be customized via the navigation system vehicle customization screen.

HINT:

The main body ECU (multiplex network body ECU) controls the front power seat control system (w/ Memory) related items that are customizable via the radio and display receiver assembly screen.

CAUTION / NOTICE / HINT

NOTICE:

• Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

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• When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
  • A communication malfunction DTC may be stored.
  • The radio and display receiver assembly may not operate normally.
• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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PROCEDURE

(a) Use the Techstream to check if the CAN communication system is functioning normally.

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OK:

CAN communication DTCs are not output.

NG

GO TO CAN COMMUNICATION SYSTEM

OK

(a) Check if the front power seat control system (w/ Memory) is malfunctioning.

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HINT:

Customization may not be possible depending on the malfunction in the front power seat control system (w/ Memory).

OK:

No malfunctions are present in the front power seat control system (w/ Memory).

NG

GO TO FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)

OK

(a) Display the "Vehicle Customization" screen.

(b) Make a note of the customizable items for each main body ECU (multiplex network body ECU).

HINT:

The items shown as customizable via the navigation system vehicle customization screen can also be changed using the Techstream. In the following step, the Techstream will be used.

(1) To match-up the items on the radio and display receiver assembly with the items on the Techstream, check the customize parameters list for the front power seat control system (w/ Memory) related items that can be customized via the radio and display receiver assembly screen.

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(c) Using the Techstream, check that it is possible to change the settings of the customize parameters that are available for customization via the radio and display receiver assembly screen.

OK:

The items available for customization via the radio and display receiver assembly screen can be customized successfully using the Techstream.

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)