Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: 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

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,B15A0,B15B3-B15B5,B15B7,B15BA,B15F9)
    DESCRIPTION These DTCs are stored when a malfunction occurs in the radio receiver assembly DTC No. Detection Item DTC Detection Condition Trouble Area B1551 HD Radio Tuner Malfunction ...

    Touch Pad Sensor Malfunction (B1559)
    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. ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Owners Manual > Lexus Display Audio system: Using the radio
    Radio operation Select "AM", "FM" or "SAT" on the audio source selection screen to begin listening to the radio. Radio top screen Pressing the "RADIO" button displays the radio top screen from any screen of the selected source. Selecting a station (AM or FM radio) Tune in to the desired sta ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Electric Parking Brake System: Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Electric Parking Brake System DTC No. Detection Item Memory Note Link C059704 Brake System Control Module "A" System Internal Failure DTC stored An electric parking brake system malfunction is displayed on the multi-information display. C05 ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2026 Copyright www.lexusrx.net
    0.0121