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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Lane Keep Assist / Lane Departure Assist System (Diagnostic Codes & Circuit Tests) >> LKA/LDA System >> DTC C1AA2: Vehicle Speed Tolerance Malfunction [10/2015 - 08/2019] >> Procedure

DTC C1AA2: Vehicle Speed Tolerance Malfunction [10/2015 - 08/2019]: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (ON-VEHICLE INSPECTION) 
    1. Perform On-vehicle Inspection of the meter/gauge system.

      Refer to ON-VEHICLE INSPECTION [10/2015 - 08/2016] , or refer to ON-VEHICLE INSPECTION [08/2016 - 12/2017] , or refer to ON-VEHICLE INSPECTION [12/2017 - 08/2018] , or refer to ON-VEHICLE INSPECTION [08/2018 - ]

      HINT: 

      Check the meter function by referring to On-vehicle Inspection for the combination meter assembly.

      Result

      Result Proceed to
      Combination meter assembly is normal A
      Combination meter assembly is malfunctioning B

    Result: 

    CHECK METER / GAUGE SYSTEM (SPEEDOMETER MALFUNCTION). Refer to  Speedometer Malfunction [10/2015 - 08/2018]  , or refer to  Speedometer Malfunction [08/2018 - ] 

    Result: 

    See step  2

  2. CHECK FOR DTCs (LKA/LDA SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Chassis > LKA/LDA > Clear DTCs 

    2. Perform the following procedure.

      HINT: 

      If the following procedure is not performed, the previously output DTC cannot be detected.

      1. Turn the power switch on (IG) and wait 1 minute or more.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Chassis > LKA/LDA > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AA2 is not output A
      DTC C1AA2 is output B

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 12/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 03/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2018 - 08/2019] 

    Result: 

    See step  3

  3. REPLACE FORWARD RECOGNITION CAMERA 
    1. Replace the forward recognition camera.

      Refer to REMOVAL [10/2015 - 08/2019]

    2. Perform Forward Recognition Camera Learning.

      Refer to ADJUSTMENT [10/2015 - 08/2019]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTCs (LKA/LDA SYSTEM) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Chassis > LKA/LDA > Clear DTCs 

    2. Perform the following procedure.

      HINT: 

      If the following procedure is not performed, the previously output DTC cannot be detected.

      1. Turn the power switch on (IG) and wait 1 minute or more.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Chassis > LKA/LDA > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AA2 is not output A
      DTC C1AA2 is output B

    Result: 

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE) 

    Result: 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  COMPONENTS [10/2015 - 03/2018]  , or refer to  COMPONENTS [03/2018 - ]