Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2009GS 350 RWD V6-3.5L (2GR-FSE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC15C5
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)
C15C5
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)SECTION C15C5
STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C15A3/63: Actuator Malfunction
DTC C15A3/63 - Actuator Malfunction
DTC C15C5/69 - 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK WIRE HARNESS
(a) Turn the engine switch off.
(b) Disconnect the connectors from the steering control ECU and the steering actuator.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:
NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
2. CHECK STEERING ACTUATOR
(a) Connect the connector to the steering actuator.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:
NG -- REPLACE STEERING ACTUATOR
OK -- REPLACE STEERING CONTROL ECU
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.