Dtc C15A3/63 Actuator Malfunction

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRE HARNESS

CHECK STEERING ACTUATOR

DTC C15A3/63 Actuator Malfunction

DTC C15C5/75 Motor Revolution Angle Signal (Test Mode DTC)


DESCRIPTION

The steering actuator drives the internal motor using the current output from the steering control ECU to change the relative angle between tire angle and steering wheel angle.
The rotation angle sensor in the steering actuator detects the motor rotation angle and outputs this information to the steering control ECU.
If the steering control ECU detects a malfunction in the rotation angle sensor circuit, it will store DTC C15A3/63.

DTC No.
DTC Detecting Condition
Trouble Area
C15A3/63
The steering control ECU detects a malfunction in the rotation angle sensor circuit.
  1. Wire harness and connector
  2. Steering actuator
  3. Steering control ECU

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C15A3/63 Actuator Malfunction


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C15A3/63 Actuator Malfunction

  1. Turn the engine switch off.

  1. Disconnect the connectors from the steering control ECU and the steering actuator.

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

    Resistance:
    Tester connection
    		Specified condition
    L70-4 (S1) - L26-5 (S1+)
    		Below 1 Ω
    L70-6 (RV) - L26-1 (RV+)
    		Below 1 Ω
    L70-14 (S2) - L26-9 (S2+)
    		Below 1 Ω
    L70-15 (RG) - L26-10 (RG+)
    		Below 1 Ω
    L70-4 (S1) - L70-6 (RV)
    		10 kΩ or higher
    L70-4 (S1) - L70-14 (S2)
    		10 kΩ or higher
    L70-4 (S1) - L70-15 (RG)
    		10 kΩ or higher
    L70-6 (RV) - L70-14 (S2)
    		10 kΩ or higher
    L70-6 (RV) - L70-15 (RG)
    		10 kΩ or higher
    L70-14 (S2) - L70-15 (RG)
    		10 kΩ or higher
    L70-4 (S1) - Body ground
    		10 kΩ or higher
    L70-6 (RV) - Body ground
    		10 kΩ or higher
    L70-14 (S2) - Body ground
    		10 kΩ or higher
    L70-15 (RG) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE WIRE HARNESS
OK


2.CHECK STEERING ACTUATOR


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc C15A3/63 Actuator Malfunction

  1. Connect the connector to the steering actuator.

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

    Resistance:
    Tester connection
    		Specified condition
    L70-4 (S1) - L70-6 (RV)
    		Below 100 Ω
    L70-4 (S1) - L70-14 (S2)
    		Below 100 Ω
    L70-4 (S1) - L70-15 (RG)
    		Below 100 Ω
    L70-6 (RV) - L70-14 (S2)
    		Below 100 Ω
    L70-6 (RV) - L70-15 (RG)
    		Below 100 Ω
    L70-14 (S2) - L70-15 (RG)
    		Below 100 Ω
    L70-4 (S1) - Body ground
    		10 kΩ or higher
    L70-6 (RV) - Body ground
    		10 kΩ or higher
    L70-14 (S2) - Body ground
    		10 kΩ or higher
    L70-15 (RG) - Body ground
    		10 kΩ or higher


NG
REPLACE STEERING ACTUATOR
OK

REPLACE STEERING CONTROL ECU