2005-2012 Acura RL Keyless Access Module: Failure Symptoms & Programming Guide

Symptoms of a Failing Keyless Access Module

A problem with the Keyless Access Control Unit can manifest in several ways, ranging from minor annoyances to leaving you stranded. Because its functions are tied to other common failure points, it's important to diagnose the issue correctly.

• "Check Keyless Access System" Message: This is the most direct indicator. A persistent warning message on the multi-information display (MID) often points to a fault within the module or one of its related components.
• Key Fob Not Detected: The car may fail to recognize the key fob is nearby. This means the doors won't unlock when you touch the handle, and the push-to-start button won't work. You may have to use the physical key to enter and start the car.
• Engine Won't Start (Immobilizer Fault): A critical failure can prevent the module from communicating with the immobilizer system. The engine may crank but not start, or not crank at all, and you'll likely see a flashing green key icon on the dashboard.
• Parasitic Battery Drain: This is a very common and frustrating symptom. The module can fail to enter its low-power "sleep" mode when the car is off, causing a continuous current draw that drains the battery overnight or over a few days. This issue is often traced to the circuit protected by fuse #7 in the driver's side under-dash fuse box.
• Memory Seat/Wheel/Mirror Failure: The system may stop recognizing Driver 1 vs. Driver 2, or the memory buttons may become unresponsive, failing to recall your saved positions.
• Erratic Door Lock and Alarm Behavior: Doors may not lock or unlock with the fob or interior switches, and the factory alarm might trigger unexpectedly when starting the car with the physical key.

Known Issues, TSBs, and Recalls

While there are no direct recalls for the Keyless Access Control Unit itself, Acura has released Technical Service Bulletins (TSBs) related to its functions:

• TSB #10016274 (also listed as #505): Addresses an issue where the system intermittently recalls Driver 2's settings even when the Driver 1 fob is used to unlock the doors. This points to a logic issue within the module.
• TSB #10018036 (also listed as #07012005): Provides diagnostic guidance for when the engine won't start intermittently, instructing technicians to check the immobilizer system status with the Honda Diagnostic System (HDS). This is directly related to the module's security function.
• TSB #10021177 (also listed as #1006): Details troubleshooting for B-CAN and F-CAN network communication Diagnostic Trouble Codes (DTCs). A failing Keyless Access Module can disrupt network communication and generate these types of codes.

Programming and Installation Requirements

The module stores your vehicle's unique immobilizer code and key fob data. When a new or used module is installed, it must be registered to the car's Powertrain Control Module (PCM) and all existing key fobs must be re-registered to the new module. This process is often called "immobilizer registration" or "key programming."

Who Can Program the Module?

• Acura/Honda Dealerships: They have the proprietary Honda Diagnostic System (HDS) software required to perform the registration. This is the most straightforward, but often most expensive, option.
• Automotive Locksmiths: Many professional locksmiths have advanced diagnostic tools (such as Autel, Smart Pro, etc.) with the necessary software to program Acura immobilizer systems and keys. This is often a more affordable and convenient option than the dealer.
• Independent Repair Shops: A well-equipped independent shop may be able to perform the programming. They need a J2534 pass-thru device and an active subscription to Honda's i-HDS software, specifically the Vehicle Security Professional (VSP) version, which requires a NASTF registry ID.
• Advanced DIY (High Risk): For those with advanced electronics skills, it is theoretically possible to desolder the EEPROM chip (a small memory chip) from your original module and solder it onto the replacement used module. This physically transfers all the car's security data, avoiding the need for software programming. This is a delicate operation that can permanently damage the modules if done incorrectly.

Buying a Used Vehicle Control Module

Given the high cost of a new module, a used OEM unit is an excellent value. However, there are critical factors to consider.

1. Match the Part Number: The part numbers 38320-SJA-A01, 38320-SJA-A02, and 38320-SJA-A03 are generally interchangeable, with the higher number representing a later revision. Always try to get the newest revision available, but any of these should work once programmed.
2. Factor in Programming Costs: Remember that the price of the used part is not the final cost. You must budget for professional programming, which can range from $150 to $400 depending on your location and whether you go to a locksmith or a dealer.
3. Inspect for Damage: The module is located under the driver's side dash near the fuse box. This area can be vulnerable to water leaks from a bad windshield seal. Inspect any used unit for signs of corrosion, water stains, or physical damage to the casing or connectors.
4. Why Used OEM is a Good Choice: For an electronic part like this, a used original equipment (OEM) module that has been tested and is known to be functional is often a more reliable choice than a new, unproven aftermarket part (of which there are few, if any, for this specific component). The hardware is proven, and once programmed, it will function exactly as the original did.

Cost Breakdown

Prices can vary, but this gives a general idea of the costs involved in replacing the Keyless Access Control Unit.

Frequently Asked Questions (FAQ)