Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Extension Module Malfunction 2 (B1556)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the Navigation ECU.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the navigation ECU, always replace it with a new one. If a navigation ECU which was installed to another vehicle is used, the following may occur:

• A communication malfunction DTC may be stored.
• The navigation ECU may not operate normally.

PROCEDURE

(a) Clear the DTCs.

(b) Recheck for DTCs and check that no DTCs are output.

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE NAVIGATION ECU