Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Steering Angle Sensor (C1297)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Drivetrain / Mf1a (transfer / 4wd / Awd) / Dynamic Torque Control Awd System / Steering Angle Sensor (C1297)

DESCRIPTION

The 4WD ECU assembly determines that the vehicle is turning based on the signals sent from the steering sensor.

The steering sensor signal is sent to the 4WD ECU assembly via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1297

Steering Angle Sensor

When the IG1 terminal voltage is 9.5 V or more, a steering sensor malfunction signal is received.
  • Vehicle stability control system
  • Steering sensor
  • CAN communication system
  • 4WD ECU assembly

CAUTION / NOTICE / HINT

NOTICE:

When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

Click here

HINT:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG) and check that no CAN communication system DTCs are output.

Click here

(d) Start the engine.

(e) Drive the vehicle at a speed of 35 km/h (24 mph), turn the steering wheel to the right and left and check that no Vehicle Stability Control system (steering angle sensor) DTCs are output.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

CAN communication system DTCs and vehicle stability control system DTC are not output

A

CAN communication DTCs are output

B

Vehicle stability control system (steering angle sensor) DTCs are output

C

HINT:

If CAN communication DTCs are output, perform troubleshooting for the CAN communication system first.

B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

C

REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY CONTROL SYSTEM)

A

2.

READ VALUE USING TECHSTREAM (STEERING ANGLE VALUE)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Four Wheel Drive / Data List.

(e) Read the value displayed on the Techstream.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering Angle Value

Steering angle value

Min.: -3276.8°

Max.: 3276.7°

During steering operation: Changes in accordance with steering wheel rotation

Left turn: Increases

Right turn: Decreases
Chassis > Four Wheel Drive > Data List

Tester Display

Steering Angle Value

OK:

The steering angle sensor value changes in accordance with the steering wheel movement.

OK

REPLACE 4WD ECU ASSEMBLY

NG

REPLACE STEERING SENSOR

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