Lexus ES manuals

Lexus ES: Extension Module Malfunction 2 (B1556)

DESCRIPTION

This DTC is 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:

  • 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.

    Click here

  • 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

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DESCRIPTION This DTC is stored if the remote touch (remote operation controller assembly) detects a malfunction in itself, such as internal hardware failure or remote touch screen sensor malfunction.

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DESCRIPTION The multi-display assembly and parking assist ECU are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. Detect

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DESCRIPTION The radio receiver assembly and multi-display assembly are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. D

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 System Diagram

SYSTEM DIAGRAM *1 Throttle Body with Motor Assembly *2 Intake Air Control Valve (for ACIS) *3 Intake Air Control Valve Actuator (for ACIS) *4 ECM *5 Vacuum Switching Valve (for ACIS) - - *a Engine Speed Signal *b from Vacuum Pump

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