Toyota Avalon Service & Repair Manual: Extension Module Malfunction 2 (B1556)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1556

Extension Module Malfunction 2

When any of the following conditions is met:

  • Internal power supply malfunction
  • Internal hard drive malfunction
  • EEPROM error
  • Storage malfunction

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

1.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

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

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE NAVIGATION ECU

    HD Radio Tuner Malfunction (B1551,B158D,B15A0,B15B0,B15B3,B15B7,B15BA,B15F9)

    Voice Recognition Microphone Disconnected (B1579)

    See More:

    Toyota Avalon Service & Repair Manual > Power Steering System(for Gasoline Model): EPS Warning Light Circuit
    CAUTION / NOTICE / HINT NOTICE: Perform this troubleshooting procedure when no DTCs are output, including DTCs related to CAN communication system malfunctions. If the customer reports that the steering feels heavy, refer to the "Heavy steering" item in the Problem Symptoms Table. Click here PROCEDU ...

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