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 / Navigation / Multi Info Display / Navigation System / How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS
  • When troubleshooting, check 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 problem 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.

INSPECT BATTERY

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

HINT:

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

NEXT

4.

CHECK CABIN

(a) Check that condensation is not likely to occur in the cabin and that the temperature is not high or extremely low in the cabin.

OK:

Condensation is not likely being produced and the temperature is not high or extremely low.

HINT:

  • A humid cabin and a rapid change in temperature may lead to condensation. Condensation in the cabin may cause a short circuit.
  • The navigation system may not operate normally when the temperature is -20°C (-4°F) or lower, or 65°C (149°F) or higher.
NG

SET CABIN TO APPROPRIATE TEMPERATURE
OK

5.

CHECK NAVIGATION SYSTEM NORMAL CONDITION

(a) Refer to Check System Normal Condition.

Click here

Result

Proceed to

Symptom is not normal operation.

A

Symptom is normal operation.

B
B

END
A

6.

CHECK CAN COMMUNICATION SYSTEM*

(a) Check if CAN communication system DTCs are output.

Click here

Result

Proceed to

CAN DTCs are not output.

A

CAN DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

7.

CHECK FOR DTC*

(a) Check for DTCs.

Body Electrical > Navigation System > Trouble Codes

Result

Proceed to

DTCs are output.

A

DTCs are not output.

B
B

GO TO STEP 11

A

8.

DTC CLEAR*

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

HINT:

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

NEXT

9.

RECHECK FOR DTC*

(a) Recheck for DTCs.

Body Electrical > Navigation System > Trouble Codes

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 11

A

10.

DIAGNOSTIC TROUBLE CODE CHART

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

Click here

NEXT

GO TO STEP 13

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 symptoms do not recur and no DTCs are output, attempt to reproduce the symptoms.

Click here

B

GO TO STEP 13

A

12.

PERFORM TROUBLESHOOTING BASED ON PROBLEM SYMPTOM

(a) Refer to Terminals of ECU.

Click here

NEXT

13.

CHECK CIRCUIT

(a) Adjust, repair or replace as necessary.

NEXT

14.

RECHECK FOR DTC*

(a) After clearing DTCs, recheck for DTCs.

Body Electrical > Navigation System > Clear DTCs Body Electrical > Navigation System > Trouble Codes
NEXT

15.

PERFORM CONFIRMATION TEST
NEXT

END
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