Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Operation Check




  • This function shows the telematics network status when the DCM (telematics transceiver) was operated. Use this when no DTC is present but this telematics system was unable to connect to the call center. This symptom may occur if cell phone signal strength is very weak.
  • This function is used to display operation history information and the time at which it was stored in the DCM (telematics transceiver).

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Choose "Telematics" from the System Selection Menu, and then click "Utility".

(e) Click "DCM Operation History" on the Utility Selection Menu.

Body Electrical > Telematics > Utility

Tester Display

DCM Operation History

(f) Choose "Items" on the DCM Operation History Menu.


  • When "Operation Code" is recorded, DCM Operation History is displayed on the Techstream.
  • The displayed "Function" differs depending on the selected "Items".

(g) Refer to the following chart and check the system operation status displayed on the Techstream. (The following chart is an example of the system operation status.)

System Operation Status Example

Occurrence time (*1)

Operation Code (*2)

Function (*3)

Content (*4)

Roaming (*5)

Voice Call (*6)

Service Area (*7)

Electric Level (*8)

2017/12/31 12:40:50


GNSS (Satellite)

Unreceived GNSS (Satellite) signal



Out of Service

Level 0

Tester Display Description

Tester Display




Occurrence time

Indicates date of the DCM (Telematics Transceiver) operation.



Operation Code

Indicates the Operation Code.





function name



  • GNSS (Satellite)
  • Collision Detection
  • Network Power Supply Control
  • SMS
  • Telematics PF
  • Failure Due to Conflict
  • Activate Function

Remote Diagnostics

  • Remote Warning
  • Remote DTC / FFD
  • Remote Monitoring
  • Remote Vehicle History
  • Remote DTC / FFD on IP
  • Remote Monitoring on IP

Center Request

Center Request Command

Remote Service

  • Maintenance Assistance
  • Remote Diagnostics Recorder
  • Remote Confirmation
  • Under Repair Rejection
  • Last File

Remote Control

  • Remote Control
  • Remote Hazard
  • Remote Door Lock
  • Remote Power Window
  • Pre Air-Conditioning


  • Alarm Notification
  • Remote Immobilizer
  • Stolen Vehicle Tracking
  • Remote Vehicle Tracking

Operation Monitor

Operation Monitoring


  • Air Data Feed
  • APN Selection
  • TSC Client Authentication
  • Simple HTTP Proxy 1
  • Simple HTTP Proxy 2
  • Simple HTTP Proxy 3
  • Simple HTTP Proxy 4
  • Simple HTTP Proxy 5
  • Simple HTTP Proxy 6
  • Simple HTTP Proxy 7
  • Simple HTTP Proxy 8

Vehicle Information

  • Vehicle Info. CAN
  • Vehicle Info. Ethernet



Indicates the content.




Indicates whether roaming was used for the communication network.



Voice Call

Indicates whether there was a voice call.

With or Without


Service Area

Indicates whether the vehicle was in the service area.

Out of Service, Within Range, OFF the Air or Start up (LTE)


Electric Level

Indicates the strength of the cellular signal received by the vehicle.

Level 0, Level 1, Level2, Level3, Level 4, Level 5

    How To Proceed With Troubleshooting
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

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

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