Dtc C1595/55 Lost Communication With Steering Angle Sensor Module

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STEERING ANGLE SENSOR

CHECK WIRE HARNESS

CHECK STEERING ANGLE SENSOR

DTC C1595/55 Lost Communication with Steering Angle Sensor Module

DTC C15C4/74 Steering Angle Signal (Test Mode DTC)


DESCRIPTION

Signal transmission between the steering control ECU and steering angle sensor is performed via serial communication.
If an error occurs between them in serial communication, the ECU will store DTC C1595/55.

DTC No.
DTC Detecting Condition
Trouble Area
C1595/55
The steering control ECU detects an error in serial communication between the ECU and steering angle sensor.
  1. Steering angle sensor
  2. Wire harness and connector
  3. Steering control ECU

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C1595/55 Lost Communication With Steering Angle Sensor Module


INSPECTION PROCEDURE

1.CHECK STEERING ANGLE SENSOR

  1. Check that a steering angle sensor with the specified part number is installed.

    Standard:
    A steering angle sensor with the specified part number (89245-30070) is installed.


NG
REPLACE STEERING ANGLE SENSOR
OK


2.CHECK WIRE HARNESS


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C1595/55 Lost Communication With Steering Angle Sensor Module

  1. Turn the engine switch off.

  1. Disconnect the connectors from the steering control ECU and the steering angle sensor.

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

    Resistance:
    Tester connection
    		Specified condition
    L70-10 (SS1-) - L19-7 (SS1-)
    		Below 1 Ω
    L70-19 (SS1+) - L19-8 (SS1+)
    		Below 1 Ω
    L70-19 (SS1+) - Body ground
    		10 kΩ or higher
    L70-10 (SS1-) - Body ground
    		10 kΩ or higher
    L70-19 (SS1+) - L70-10 (SS1-)
    		1 kΩ or higher


NG
REPAIR OR REPLACE WIRE HARNESS
OK


3.CHECK STEERING ANGLE SENSOR


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C1595/55 Lost Communication With Steering Angle Sensor Module

  1. Connect the connector to the steering angle sensor.

  1. Adjust the shift lever to neutral.

  1. Jack up the vehicle.

  1. Turn the engine switch on (IG).

  1. Check the signal waveform according to the condition in the table below.

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    L70-19 (SS1+) -
    L70-10 (SS1-)
    		Engine switch on (IG), rotate steering wheel slowly
    		Pulse generation
    (0 ←→ 5 V)
    HINT:
    The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.


NG
REPLACE STEERING ANGLE SENSOR
OK

REPLACE STEERING CONTROL ECU