2006 INFINITI M35 Rear Active Steer (RAS) Module: Warning Lights, Relays, and Replacement
This guide covers the common failures, programming requirements, and troubleshooting steps for the Rear Active Steer (RAS) control module found on the 2006 INFINITI M35 Sport.
- A replacement module IS NOT plug-and-play and REQUIRES programming by an Infiniti dealer or specialist with CONSULT-III software.
- Before replacing the expensive module, always check the small, inexpensive external relay (Part # 25230-79917) attached to it, as this is a very common failure point.
- The RAS control module is located in the trunk, on the passenger side, behind the liner inside the fender well.
- A fault in the RAS system will typically illuminate the RAS, VDC OFF, and SLIP warning lights, and disable the cruise control.
Symptoms of a Failing Rear Wheel Steering Control Module
When the Rear Active Steer (RAS) control module or a related component fails, the car will typically provide clear warnings on the instrument cluster.
- "RAS" Warning Light: The most direct symptom is the illumination of the amber "RAS" warning light on the dash. This indicates the Rear Active Steer system has detected a fault and has been disabled.
- VDC and SLIP Lights: Often, a fault in the RAS system will also cause the "VDC OFF" and "SLIP" lights to illuminate, as the systems are interconnected.
- Cruise Control Disabled: Many owners report that when the RAS warning light is active, the cruise control system will not engage.
- Changes in Handling: While some drivers report not noticing a significant difference, others find the vehicle's handling at highway speeds feels less stable or predictable with the RAS system disabled.
Common Diagnostic Trouble Codes (DTCs)
A professional scan tool capable of reading Infiniti-specific chassis codes is required to retrieve faults from the RAS system. While specific codes for the 2006 M35 are not widely published, service bulletins for the next-generation Infiniti 4-Wheel Active Steer (4WAS) system indicate that the following codes may point to a control unit failure.
- C1631
- C1930
- C1138
These codes, especially when appearing together, strongly suggest a problem with the control unit or its communication network.
Known Issues and Diagnosis for the 2006 M35
Before condemning the expensive control module, there are several common and much cheaper failure points to investigate.
The RAS Relay: A Common and Inexpensive Fix
Pro Tip: The most common failure point is not the module itself, but a small, inexpensive relay attached to it. Before buying any major parts, inspect and consider replacing the RAS relay (OEM Part Number: 25230-79917). In many cases, simply unplugging and firmly reseating this relay can temporarily resolve the issue, confirming it's the source of the problem. A new relay costs a fraction of the price of a control module.
Check the Fuse
The RAS control unit shares a 10-amp fuse with several other systems, including the ABS/VDC unit and steering angle sensor. This fuse, labeled #82, is located in the fuse box in the engine compartment. If this fuse is blown, multiple warning lights will appear. Always check fuses before replacing expensive electronic components.
Module Location
The Rear Active Steer (RAS) control module is located in the trunk. To access it, you will need to remove the trunk lining on the right-hand (passenger) side. The module is the upper of two electronic units mounted vertically inside the fender well area. It is held in place by three screws and has several electrical connectors, including the external relay.
Warning: The Rear Active Steer system is a complex electronic and mechanical system. Diagnosis and repair should only be performed by those with experience in automotive electronics. Improper handling can lead to further damage.
Programming and Calibration Requirements
This is the single most important factor when considering a replacement module.
A replacement Rear Wheel Steering Control Module must be programmed to the vehicle. This is not a plug-and-play part. While direct confirmation for this specific module is not in a public TSB, Infiniti's service procedures for nearly all other control modules from this era (including the ECM, TCM, and other steering modules) require programming and configuration using the dealer-level CONSULT-III or CONSULT-III plus diagnostic tool. A used module will need to be wiped and reprogrammed to your vehicle's specific VIN and options. Failure to program the module will result in it not functioning and the RAS warning light remaining on.
This procedure can only be performed by an Infiniti dealership or a well-equipped independent specialist shop with the proper subscription and hardware. There is no known method for DIY or locksmith programming.
Buying a Used Rear Wheel Steering Control Module
Given the high cost of a new module, a used OEM part is a viable option, but you must proceed with caution.
- Verify the Part Number: Ensure the part number on the used module exactly matches your original unit. The primary part numbers are 28505-EH100 and the updated version 28505-EH10A.
- Budget for Programming: The cost of buying the used module is only part of the total expense. You MUST factor in the cost of having it professionally programmed and installed. Call local Infiniti dealers or specialists beforehand to get a quote for programming a customer-supplied used module.
- Inspect the Connectors: Check the pins on the used module for any signs of corrosion, moisture, or damage. Water intrusion into the trunk can damage these electronics.
- Check the Relay First: Before buying a module, always try replacing the small external relay (25230-79917) first. It is a much more common and cheaper point of failure.
Cost Breakdown
Prices can vary by location and supplier, but this provides a general estimate for repairing the RAS system.
| Part or Service | Estimated Cost |
|---|---|
| New OEM Control Module (Part Only) | $1,500+ |
| Used OEM Control Module (Part Only) | $150 - $400 |
| New OEM Relay (25230-79917) | $15 - $30 |
| Shop Labor (Programming & Installation) | $200 - $400 |
Frequently Asked Questions (FAQ)
Do I have to program a replacement RAS control module?
Yes. Based on extensive service documentation for similar Infiniti systems, a replacement module—whether new or used—must be professionally programmed to your vehicle's VIN using dealer-specific software. It will not work correctly otherwise.
Can I drive my M35 with the RAS light on?
Yes, but with caution. When the RAS light is on, the system is disabled and the rear wheels remain in a fixed, neutral position. The car is safe to drive, but it will not have the enhanced handling characteristics the system normally provides. Note that other safety systems like VDC and cruise control may also be disabled.
My RAS, SLIP, and VDC lights are all on. Is it the module?
It could be, but you should check the simple things first. This combination of lights is a known symptom. Start by checking fuse #82 in the engine bay. If the fuse is good, the next step is to inspect or replace the small blue and white relay (part # 25230-79917) attached to the RAS module in the trunk, as this is a very common failure point.
Does every 2006 M35 have Rear Active Steering?
No. The Rear Active Steer (RAS) system was only available on the 2006 M35 as part of the Sport Package. Base and M35x (AWD) models were not equipped with this feature.
Technical Specifications
OEM Part Numbers: 28505-EH100 28505-EH10A
Associated Relay Part Number: 25230-79917. System Fuse: 10A, #82 in engine compartment fuse box.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- INFINITI M35:
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- Symptoms of a Failing Rear Wheel Steering Control Module
- Common Diagnostic Trouble Codes (DTCs)
- Known Issues and Diagnosis for the 2006 M35
- The RAS Relay: A Common and Inexpensive Fix
- Check the Fuse
- Module Location
- Programming and Calibration Requirements
- Buying a Used Rear Wheel Steering Control Module
- Cost Breakdown
- Frequently Asked Questions (FAQ)
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