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

NOTICE:

• After the engine switch is turned off, the radio receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 120 seconds before disconnecting the cable from the negative (-) battery terminal.
• When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

  System Name	See Procedure
  Lane Control System
  Pre-collision System
  Intelligent Clearance Sonar System
  Parking Assist Monitor System
  Panoramic View Monitor System
  Lighting System (w/ Automatic Headlight Beam Level Control System)
  Power Door Lock Control System
  Power Back Door System (w/ Outside Door Control Switch)

NOTICE:

• When performing the following work, the audio and visual system may restart when turning the engine switch on (ACC) (due to radio receiver assembly and navigation ECU certification).
  • Repair or replace the negative (-) battery terminal due to it being disconnected or depleted.
  • The radio receiver assembly or navigation ECU replacement or removal and installation.
• After replacing the radio receiver assembly, if the "New software is not compatible with the system. Contact your dealer." on-screen message is displayed on the multi-display, update the software of the navigation ECU.
• After replacing the navigation ECU, if the "New software is not compatible with the system. Contact your dealer." on-screen message is displayed on the multi-display, update the software of the radio receiver assembly.

Audio And Visual System (for 12.3 Inch Display)

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Parts Location

PARTS LOCATION ILLUSTRATION *1 TELEPHONE MICROPHONE ASSEMBLY *2 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - AMP FUSE - ECU-IG1 NO. 8 FUSE - RADIO NO. 1 FUSE - RADIO NO. 2 FUSE ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Audio And Visual System (for 12.3 Inch Display): 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 ma ...

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Lexus Enform System: DCM Data Signal Circuit between Navigation ECU and DCM
DESCRIPTION This circuit is used to send and receive signals between the DCM (Telematics Transceiver), radio receiver assembly and navigation ECU. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) (a) Disconnect the J157 DCM (T ...