Dtc C1777 Steering Angle Sensor Circuit

Suspension & Axle. Lexus Gs430, Gs300. Uzs190 Grs190
Suspension Control. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR INPUT VOLTAGE)

DTC C1777 Steering Angle Sensor Circuit


DESCRIPTION

  1. The steering angle sensor detects the amount and direction of steering wheel movement and inputs these details to the absorber control ECU via CAN communication.
  2. The fail-safe function prohibits roll posture control if any malfunction occurs in the steering angle sensor circuit (Click here).

DTC No.
DTC Detection Condition
Trouble Area
C1777
Either the steering angle sensor DTC or steering angle sensor power source DTC is received for 5 seconds or more.
  1. Steering angle sensor
  2. Steering angle sensor circuit

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Suspension Control.Adaptive Variable Suspension System. Dtc C1777 Steering Angle Sensor Circuit


INSPECTION PROCEDURE

HINT:
  1. Check the condition of each related circuit connector before troubleshooting (Click here).
  2. When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (Click here).
1.CHECK DTC

  1. Clear the DTC (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output.

  1. Start the engine.

  1. Drive the vehicle and turn the steering wheel to the right and left at the speed of 35 km/h (24 mph) to check that a DTC is output (Click here and Click here).

    Result:

    Result
    		Proceed To
    Only DTC C1777 is output
    		A
    CAN communication system DTC is output
    		B
    Steering angle sensor DTC is output (Brake control system trouble code C1231/31)
    		C


B
REPAIR CIRCUIT INDICATED BY OUTPUT CODE

C
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A


2.CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR INPUT VOLTAGE)


    Lexus Gs430, Gs300. Uzs190 Grs190.Suspension Control.Adaptive Variable Suspension System. Dtc C1777 Steering Angle Sensor Circuit

  1. Disconnect the steering angle sensor connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L19-1 (IG) -
    L19-2 (ESS)
    		Engine switch on (IG)
    		10 to 14 V

  1. Turn the engine switch off.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    L19-2 (ESS) - Body ground
    		Below 1 Ω

    Result:

    Result
    		Proceed To
    OK
    		A
    OK (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)
    		B
    NG
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE STEERING ANGLE SENSOR