Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Front Recognition Camera Optical Axis Misalignment Malfunction (C1AA800)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Engine & Hybrid System / Cruise Control / Front Camera System / Front Recognition Camera Optical Axis Misalignment Malfunction (C1AA800)

DESCRIPTION

The forward recognition camera monitors its optical axis status. If it determines that the optical axis alignment has become misaligned, it will store DTC C1AA800.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AA800

Front Recognition Camera Optical Axis Misalignment Malfunction

When the forward recognition camera detects an optical axis misalignment when the vehicle is being driven at a speed of 5 km/h (4 mph) or more, after 3 seconds have elapsed since the engine switch was turned on (IG).
  • Windshield glass
  • Vehicle operating conditions
  • Wheel alignment

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition: Click here

    Sequential Recognition: Click here

  • When replacing the windshield glass of a vehicle equipped with a forward recognition camera, make sure to use a Lexus genuine part. If a non-Lexus genuine part is used, the forward recognition camera may not be able to be installed due to a missing bracket or the forward recognition camera may not operate properly due to a difference in the transmissivity or black ceramic border.
  • Forward recognition camera optical axis may deviate if the vehicle is driven on a banked road, such as a racetrack. This deviation can be corrected by driving the vehicle on a normal road for a while.
  • Forward recognition camera optical axis may deviate when the vehicle is overloaded or the wheel alignment (toe-in) is incorrect. The forward recognition camera optical axis can be corrected by decreasing the load on the vehicle or adjusting the toe-in.

PROCEDURE

1.

CHECK FORWARD RECOGNITION CAMERA INSTALLATION

(a) Check the installation condition of the forward recognition camera.

Click here

HINT:

If there is deformation or deviation in the forward recognition camera installation bracket, replace the windshield glass.

OK:

No deformation or deviation in forward recognition camera installation bracket.

NG

GO TO STEP 11

OK

2.

CHECK VEHICLE OPERATING CONDITION

(a) Check the operating conditions of the vehicle.

HINT:

Check if a condition which caused the forward recognition camera optical axis to become temporarily misaligned existed, such as if the vehicle was overloaded, towed or modified.

OK:

Vehicle was not overloaded, towed or modified.

NG

GO TO STEP 9

OK

3.

CHECK WHEEL ALIGNMENT

(a) Check the front and rear wheel alignment (toe).

  • for Front Wheel Alignment: Click here
  • for Rear Wheel Alignment: Click here

Result

Proceed to

Front and rear wheels are not misaligned (toe)

A

Front or rear wheel is misaligned (toe)

B
B

GO TO STEP 6

A

4.

PERFORM FORWARD RECOGNITION CAMERA ADJUSTMENT

(a) Perform forward recognition camera adjustment.

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

One Time Recognition: Click here

Sequential Recognition: Click here

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Front Recognition Camera > Clear DTCs
NEXT

END

6.

ADJUST WHEEL ALIGNMENT

(a) Adjust the alignment (toe) of the wheels.

  • for Front Wheel Alignment: Click here
  • for Rear Wheel Alignment: Click here
NEXT

7.

PERFORM FORWARD RECOGNITION CAMERA ADJUSTMENT

(a) Perform forward recognition camera adjustment.

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

One Time Recognition: Click here

Sequential Recognition: Click here

NEXT

8.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Front Recognition Camera > Clear DTCs
NEXT

END

9.

PERFORM FORWARD RECOGNITION CAMERA ADJUSTMENT

(a) Return the vehicle to normal operating conditions.

(b) Perform forward recognition camera adjustment.

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

One Time Recognition: Click here

Sequential Recognition: Click here

NEXT

10.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Front Recognition Camera > Clear DTCs
NEXT

END

11.

REPLACE WINDSHIELD GLASS

(a) Replace the windshield glass.

Click here

NEXT

12.

PERFORM FORWARD RECOGNITION CAMERA ADJUSTMENT

(a) Perform forward recognition camera adjustment.

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

One Time Recognition: Click here

Sequential Recognition: Click here

NEXT

13.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Front Recognition Camera > Clear DTCs
NEXT

END
    Steering Vibrator System Missing Message (C1A7587)
    DESCRIPTION The forward recognition camera communicates with the steering vibration ECU via LIN communication. If a communication error between the forward recognition camera and steering vibration EC ...

    Front Recognition Camera Heater Malfunction (C1AAE00)
    DESCRIPTION The forward recognition camera controls the flow of current to the forward recognition with heater hood sub-assembly. If the forward recognition camera detects a malfunction in the forward ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Automatic Transaxle System: Starter Relay Circuit Short to Battery (P061512)
    DESCRIPTION While the engine is being cranked, battery voltage is applied to terminal STA of the ECM. If the ECM detects the starter control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL and stores this ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Window Defogger System: Data List / Active Test
    DATA LIST / ACTIVE TEST ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts o ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.014