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.
2009 Infiniti M45 BaseFACTORY OEM SERVICE PROCEDURE
Steering Control Systems
- DTC Index
- EPS
- Service Information
- Precautions
- System Description
- Trouble Diagnosis
- How to Perform Trouble Diagnosis
- Component Parts Location
- Wiring Diagram - EPS -
- Control Unit Input/Output Signal Standard P
- For Fast and Accurate Trouble Diagnosis
- Basic Inspection
- Inspection: Power Steering Control Unit Power Supply Circuit and Ground
- Symptom: the Steering Force Does Not Change Smoothly According to the Vehicle Speed
- Service Information
- RAS
- Service Information
- DTC Index
- Precautions
- Rear Active Steer
- System Description
- Trouble Diagnosis
- How to Perform Trouble Diagnosis
- Component Parts Location
- Schematic
- Wiring Diagram - RAS -
- Control Unit Input/Output Signal Standard
- CONSULT-III Function (RAS/HICAS)
- Diagnosis Procedure with Self-Diagnosis Function (Without CONSULT-III)
- CAN Communication
- For Fast and Accurate Trouble Diagnosis
- Basic Inspection
- Trouble Diagnosis Chart
- DTC C1900, C1901, C1905, C1906, C1907, C1908, C1909, C1922, C1927, C1928: Inspection 1 RAS Control Unit Malfunction
- DTC C1911, C1912: Inspection 2 Motor Power Supply System
- DTC C1902, C1903, C1904, C1910, C1913: Inspection 3 RAS Motor Output Malfunction
- DTC C1919: Inspection 4 Vehicle Speed Signal
- DTC C1920, C1923 - C1926: Inspection 5 Steering Angle Signal Malfunction
- DTC C1914 - C1918: Inspection 6 Rear Main Signal and Rear Sub Signal Malfunction
- DTC C1929: Inspection 7 VDC Malfunction
- DTC C1921: Inspection 8 Engine Speed Signal Malfunction
- DTC U1000, U1010: Inspection 9 CAN Communication System Malfunction
- Inspection 10 Stop Lamp Switch Harness
- Inspection 11 RAS Warning Lamp Signal
- Diagnosis Chart by Symptom 1
- Diagnosis Chart by Symptom 2
- Check RAS Static/Dynamic Characteristics
- Component Inspection
- Service Information
Factory Service Tools
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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.
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