How To Proceed With Troubleshooting

2010 Lexus RX 450h 3.5 BSECTION How To Proceed With Troubleshooting

HINT: 

  • Use the following procedure to troubleshoot the navigation system (for DVD).
  • *: Use the Techstream.
  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT: Go to next step 

  2. INSPECT BATTERY VOLTAGE 
    1. Inspect the battery voltage with the power switch off.

      Standard Voltage

      11 to 14 V

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

      NEXT: Go to next step 

  3. DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION 
    1. Ask the customer about symptoms and confirm malfunctions.

      Result

      Result Proceed to
      Other symptoms. A
      The screen displays nothing. B

      B → Go to step   10 , AND PROCEED TO  INSPECTION PROCEDURE  "BLACK SCREEN" 

      A: Go to next step 

  4. OPERATION CHECK 
    1. Refer to Check System Normal Condition. Refer to OPERATION CHECK .

      Result

      Result Proceed to
      Symptom is not normal operation. A
      Symptom is normal operation. B

      B → SYMPTOM IS NORMAL OPERATION 

      A: Go to next step 

  5. CHECK CAN COMMUNICATION SYSTEM* 
    1. Check for DTC output. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

      Result

      Result Proceed to
      DTC is not output. A
      DTC is output. B

      B → GO TO APPROPRIATE CAN COMMUNICATION SERVICE INFORMATION 

      A: Go to next step 

  6. CHECK FOR DTC* 
    1. Refer to DTC Check / Clear. Refer to DTC CHECK / CLEAR .

      Result

      Result Proceed to
      DTC is output. A
      DTC is not output. B

      HINT: 

      If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream. Refer to SYSTEM DESCRIPTION .

      B → Go to step   10 . 

      A: Go to next step 

  7. DTC CLEAR* 
    1. Refer to the DTC Check / Clear. Refer to DTC CHECK / CLEAR .

      HINT: 

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

      NEXT: Go to next step 

  8. RECHECK FOR DTC* 

    Result

    Result Proceed to
    DTC is output. A
    DTC is not output. B

    HINT: 

    • Even if the malfunction symptom is not confirmed, check for DTCs. This is because the system stores past DTCs.
    • If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream. Refer to SYSTEM DESCRIPTION .
    • Check the DTC and inspect the area code indicates.

    B → Go to step   10 . 

    A: Go to next step 

  9. DIAGNOSTIC TROUBLE CODE CHART 
    1. Find the output code in Diagnostic Trouble Code Chart. Refer to DIAGNOSTIC TROUBLE CODE CHART .
      NOTE:

      Result

      Result Proceed to
      DTCs for the navigation system are output. A
      DTCs for the audio and visual system (w/ navigation system) are output. B
      DTCs for the parking assist monitor system are output. C
      DTCs for the side monitor system (w/ parking assist monitor system) are output. D

      A → Go to step   12 . 

      B → GO TO APPROPRIATE AUDIO AND VISUAL SYSTEM (w/ Navigation System) 

      C → GO TO APPROPRIATE PARKING ASSIST MONITOR SERVICE INFORMATION 

      D → GO TO APPROPRIATE SIDE MONITOR SYSTEM (w/ Parking Assist Monitor System) 

  10. PROBLEM SYMPTOMS TABLE 
    1. Refer to Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

      Result

      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 recur and no DTC is output, perform the symptom reproduction method. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

      B → Go to step   12 . 

      A: Go to next step 

  11. PERFORM TROUBLESHOOTING BASED ON THE MALFUNCTION SYMPTOM 
    1. Refer to ECU Terminal Connector Identification. Refer to ECU TERMINAL CONNECTOR IDENTIFICATION (To 08/2009) .

      NEXT: Go to next step 

  12. CHECK THE CIRCUIT 
    1. Adjust, repair or replace as necessary.

      NEXT: Go to next step 

  13. RECHECK FOR DIAGNOSTIC TROUBLE CODE 

    HINT: 

    After clearing the DTCs, recheck for DTCs.

    NEXT: Go to next step 

  14. PERFORM CONFIRMATION TEST 

    NEXT → END 

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.