2009-2012 Acura RL EPS Module: Failure Symptoms & Programming Guide

Important: 2005-2008 vs. 2009-2012 Systems

Symptoms of a Failing Power Steering Control Module

Failure of the EPS control module is usually obvious and presents significant symptoms. The most common signs point to a loss of communication or an internal fault within the module itself.

• "Check Power Steering System" Message: The most direct indicator is a warning message appearing on the multi-information display.
• EPS Warning Light: An illuminated light on the instrument cluster, often shaped like a steering wheel with an exclamation mark, indicates a fault in the EPS system.
• Heavy or Stiff Steering: The most common physical symptom is a sudden or intermittent loss of power assist, making the steering wheel extremely difficult to turn, especially at low speeds or when stopped.
• Intermittent Failure: The steering may feel heavy one moment and return to normal the next. This inconsistency often points to an electronic fault rather than a mechanical one.
• Audible Noises: In some cases, a failing module may send erratic signals to the steering motor, causing clicking or whining sounds from the steering column area.

Associated Diagnostic Trouble Codes (DTCs)

A professional scan tool that can read Acura-specific codes is necessary for proper diagnosis. The most common code pointing directly to module failure is:

• DTC 32-09 (Motor Current Correlation): This code indicates a problem with the internal current sensor in the EPS control unit and is a strong sign that the module itself has failed.
• Other related codes may include 32-08 (EPS control unit internal circuit) or 61-04 (open/short in the EPS motor harness).

Diagnosing the Power Steering Problem

Before condemning the control module, perform these preliminary checks, as other issues can cause similar symptoms.

1. Check Battery Voltage: The EPS system draws a significant amount of electrical current. A weak or failing battery, or a poor alternator, can cause low system voltage, prompting the EPS module to shut down to protect itself. Check the battery with a multimeter; it should read around 12.6 volts with the engine off and 13.8-14.4 volts with the engine running.
2. Inspect the EPS Fuse: There is a main 70-amp fuse for the EPS system located in the under-hood fuse box. Check to ensure this fuse is not blown.
3. Scan for Codes: Use an Acura-compatible scan tool to check for the specific DTCs stored in the EPS module. The presence of code 32-09 is a very strong indicator that the module needs to be replaced.

Programming and Calibration: A Mandatory Step

The required procedure is called the "Torque Sensor Learn" or "Torque Sensor Neutral Position Memorization." This calibration process teaches the new module the neutral or straight-ahead position of the steering wheel and steering rack.

• Required Tool: This procedure can only be performed with a Honda Diagnostic System (HDS) scan tool or a high-end professional aftermarket scanner with the correct Acura-specific software.
• DIY Feasibility: While the physical replacement of the module can be done by a skilled DIY mechanic, the final programming step requires a professional-level tool. You will need to take the vehicle to a dealership or a well-equipped independent shop to have the calibration performed.
• Immobilizer Link: The EPS control module is not linked to the vehicle's anti-theft or immobilizer system, so a key reprogram is not necessary for this specific part replacement.

Buying a Used Power Steering Control Module

A used OEM module from a reputable recycler is an excellent, cost-effective alternative to a new dealer part. Since these are electronic components, here’s what to look for:

• Match Part Numbers Exactly: Ensure the part number on the replacement module matches your original unit. While several part numbers may be compatible, an exact match is the safest bet. Known part numbers include 39260-SJA-A01, 39260-SJA-A012, 39260-SJA-A012M1, 39260-SJA-A02, and 39260-SJA-A03.
• Inspect for Damage: Check the module's casing for any cracks or signs of being opened. Most importantly, inspect the connector pins to ensure they are straight, clean, and free of any corrosion or water damage.
• Source from a Reputable Seller: Purchase from a seller that offers a warranty and a clear return policy. This protects you in case the part is defective.
• Why Used OEM is a Smart Choice: For complex electronics, a used original equipment part is often more reliable than a new, cheap aftermarket version. The OEM hardware has been tested to meet Acura's standards, and failures are often due to specific component issues rather than poor overall build quality.

Replacement Overview

The EPS control module is located on the passenger side of the vehicle, up under the dashboard behind the glove box.

1. Disconnect the vehicle's battery.
2. Remove the passenger-side kick panel and lower trim.
3. Remove the glove box assembly to gain access to the area behind it.
4. The module is typically held in place by three bolts. Disconnect the electrical connectors.
5. Remove the bolts and take out the old module.
6. Install the replacement module, secure the bolts, and reconnect the electrical harnesses.
7. Reassemble the glove box and trim panels.
8. Reconnect the battery.
9. The vehicle must then be taken for the mandatory Torque Sensor Learn procedure.

Frequently Asked Questions (FAQ)