Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: How To Proceed With Troubleshooting

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Cellular Communication / Safety Connect System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the safety connect system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK

HINT:

  • The safety connect system provides a variety of functions. Therefore, it is important to identify whether a malfunction is related to the communication system, including radio wave conditions, or any other systems. Carefully check the conditions that caused the malfunction in order to determine if a temporary problem with the radio wave signal conditions caused the malfunction.
  • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
  • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
  • The following 5 items are important points for analysis:

    What

    Vehicle model, system name

    When

    Date, time, occurrence frequency

    Where

    Road conditions

    Under what conditions?

    Driving conditions, weather conditions

    How did it happen?

    Problem symptoms
NEXT

3.

PRE-CHECK

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.

VERIFY CUSTOMER SUBSCRIPTION IS ACTIVE*

(a) Enter the VIN into Vehicle Inquiry on the Techstream and verify the subscription type and expiration date.

NEXT

5.

CHECK CAN COMMUNICATION SYSTEM*

(a) Check if can communication system DTCs output.

Click here

Result

Proceed to

CAN DTCs are not output.

A

CAN DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM*

A

6.

CHECK FOR DTC*

(a) Refer to DTC Check/Clear.

Click here

Result

Proceed to

DTCs are output.

A

DTCs are not output.

B
B

GO TO STEP 10

A

7.

DTC CLEAR*

(a) Refer to DTC Check / Clear.

Click here

HINT:

The present DTCs may not indicate actual malfunctions depending on the vehicle operating conditions.

NEXT

8.

RECHECK FOR DTC*

(a) Refer to DTC Check / Clear.

Click here

Result

Proceed to

DTCs are output.

A

DTCs are not output.

B

HINT:

  • Even if the problem symptom is not confirmed, check for DTCs. This is because the system stores history DTCs.
  • If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream.
  • Check for DTCs and inspect the area that the code indicates.
B

GO TO STEP 10

A

9.

DIAGNOSTIC TROUBLE CODE CHART

(a) Find the output DTC in Diagnostic Trouble Code Chart.

Click here

NEXT

GO TO STEP 13

10.

CHECK VEHICLE CONTROL HISTORY*

(a) Check for vehicle control history and note any codes that are output.

Click here

Result

Proceed to

No vehicle control history is output

A

Any vehicle control history is output

B
B

GO TO VEHICLE CONTROL HISTORY

A

11.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result

Proceed to

Fault is not listed in Problem Symptoms Table

A

Fault is listed in Problem Symptoms Table

B

HINT:

If the symptom does not reoccur and no DTC is output, attempt to reproduce the symptoms.

Click here

B

GO TO STEP 13

A

12.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

NEXT

13.

REPAIR OR REPLACE

(a) Adjust, repair or replace as necessary.

(b) Check if the DCM (telematics transceiver) has been replaced.

Result

Proceed to

The DCM (telematics transceiver) has been replaced

A

The DCM (telematics transceiver) has not been replaced

B
B

GO TO STEP 15

A

14.

PERFORM DCM ACTIVATION*

(a) Perform "DCM ACTIVATION".

Click here

NEXT

15.

CONFIRMATION TEST
NEXT

END
    System Description
    SYSTEM DESCRIPTION DESCRIPTION (a) Safety Connect performs ACN (Automatic Collision Notification), manual emergency calling, stolen vehicle tracking and roadside assistance service by, audio and data ...

    Dcm Operation History
    DCM OPERATION HISTORY DCM OPERATION HISTORY HINT: This function shows the telematics network status when the DCM (telematics transceiver) was operated. Use this when no DTC is present but this tele ...

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