DTC C1439: Steering Angle Sensor Initialization Incomplete; DTC C1445: Vehicle Driven with Steering Angle Sensor not Initialized [04/2018 - ]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2018 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the power switch off.
Turn the power switch on (IG) again and check that no CAN communication system DTC is output.
Refer to DIAGNOSIS SYSTEM [04/2018 - 08/2020] , or refer to DIAGNOSIS SYSTEM [08/2020 - 08/2021] , or refer to DIAGNOSIS SYSTEM [08/2021 - ]
Turn the power switch on (READY).

Drive the vehicle at a speed of 35 km/h (22 mph), turn the steering wheel to the right and left, and check that no speed sensor and/or yaw rate and acceleration sensor DTCs are output.

Refer to DTC CHECK / CLEAR [04/2018 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

HINT:

When CAN communication system DTCs are output, repair the CAN communication system before repairing each corresponding sensor.
If there is a malfunction in the speed sensor or the yaw rate and acceleration sensor (airbag ECU assembly), an abnormal value may be output although the steering angle sensor is normal.
If the speed sensor and the yaw rate and acceleration sensor (airbag ECU assembly) DTCs are output simultaneously, repair these malfunctions and inspect the steering angle sensor.
If DTC C1439 and/or C1445 is not output again, the DTC may have been stored due to a temporary loss of the steering angle zero point calibration, such as when the power source voltage drops.

Result

Result	Proceed to
DTCs C1439 and/or C1445 are output.	A
CAN communication system DTCs are output.	B
Speed sensor, yaw rate and acceleration sensor and/or steering angle sensor DTCs are output.	C
DTCs C1439 and C1445 are not output.	D

Result:

INSPECT CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ]

Result:

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - 08/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2021 - ]

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ]

Result:

See step 2

CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.

Check that the centered position of the steering wheel is correctly set while driving straight ahead.

The steering wheel is centered correctly.

HINT:

If the front wheel alignment and steering position are adjusted as a result of an off-center steering wheel, acquire the yaw rate and acceleration sensor zero point again after the adjustments are completed.

Result

Proceed to
OK
NG

Result:

ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION. Refer to ADJUSTMENT [04/2018 - 08/2019] , or refer to ADJUSTMENT [08/2019 - 08/2020] , or refer to ADJUSTMENT [08/2020 - 08/2021] , or refer to ADJUSTMENT [08/2021 - ]

Result:

See step 3

RECONFIRM DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [04/2018 - ]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the power switch off.
Turn the power switch on (READY).
Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [04/2018 - ]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Result	Proceed to
DTCs C1439 and C1445 are not output.	A
Yaw rate and acceleration sensor and/or steering angle sensor DTCs are output.	B

HINT:

If DTCs C1439 and/or C1445 are not output again, the DTC may have been stored due to a temporary loss of the steering angle zero point calibration, such as when the power source voltage drops.

Result:

END

Result: