Toyota CH-R Service Manual: Extension Module Malfunction 2 (B1556)

Toyota CH-R Service Manual / Navigation / Multi Info Display / Navigation System / 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

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.

USE SIMULATION METHOD TO CHECK

REPLACE NAVIGATION ECU

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

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Extension Module Disconnected 2 (B1543)

DESCRIPTION If the radio and display receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the engine switch is turned on (ACC) and the radio and disp ...

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