1994-1996 INFINITI Q45 Access Control Module: Solving Lock, Key Fob & Immobilizer Issues
This guide explains the common failures of the keyless entry and immobilizer modules in the 1994-1996 INFINITI Q45, and clarifies the critical programming requirements after replacement.
- Replacing the Ignition Immobilizer Module (part 28595-67U00) is NOT plug-and-play; the car will not start without professional programming from a dealer or specialized locksmith.
- You can program key fobs for door locks yourself, but this procedure does not sync the key to start the engine.
- The Keyless Entry Module (2859467U00) is located in the trunk behind the passenger-side trim panel.
- Failure is often caused by old, leaking capacitors on the internal circuit board, a common issue for electronics of this era.
Symptoms of a Failing Access Control Module
When the access control or immobilizer module begins to fail, it can cause a range of frustrating electrical issues. Because these modules control both convenience and security functions, symptoms can vary from minor annoyances to problems that prevent the car from starting.
- Key Fob Inoperative: The most common symptom is when the keyless entry remote stops working. The doors will not lock or unlock when you press the buttons, even after replacing the fob's battery.
- Erratic Power Locks: The power locks may behave strangely. A common complaint is that the doors lock and then immediately unlock on their own. This can also be caused by faulty wiring or door lock actuators, but the control module is a frequent culprit.
- Engine Will Not Start: If the Ignition Immobilizer Module (on 1995-1996 models) fails, it can no longer recognize the key. The engine may crank but will not start, and the security light on the dashboard may stay on solid.
- Inability to Program New Remotes: If you are unable to complete the remote programming procedure, it may indicate a fault within the module itself.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no specific recalls or Technical Service Bulletins (TSBs) from INFINITI or the NHTSA that directly address the Vehicle Access Control Module for the 1994-1996 Q45. However, a well-documented issue for this generation of INFINITI vehicles is the failure of electrolytic capacitors inside various electronic modules due to age. These small components can leak or dry out, leading to circuit board damage and causing the exact symptoms associated with a bad access control module. This is considered the most common cause of failure for original modules from this era.
Pro Tip: Before replacing the entire module, a technician skilled in electronics repair may be able to diagnose and replace the failed capacitors on the circuit board for a fraction of the cost of a replacement unit.
Programming and Installation Requirements
This is the most critical information for anyone replacing one of these modules. The programming requirements depend on which module you are replacing and what function you need to restore.
Programming a Key Fob for Door Locks ONLY
If your module is working and you simply need to program a new or existing key fob for the door locks, you can do this yourself without any special tools. The procedure is as follows:
- Open the trunk.
- Close and lock all doors using the driver's side power lock switch.
- Insert and remove the key from the ignition cylinder 6 times within 10 seconds. The hazard lights should flash.
- Manually unlock and then lock the driver's door once.
- Within 5 seconds, press the LOCK button on the remote you wish to program.
- To program additional remotes, repeat steps 4 and 5 for each one.
IMPORTANT: This procedure ONLY programs the remote for keyless entry (locking and unlocking doors). It does NOT program the key to start the car.
Replacing the Module Itself
Warning: Replacing the Ignition Immobilizer Module (28595-67U00) is NOT a plug-and-play repair. The vehicle will not start until the new module is initialized to the vehicle's computer and keys.
While the 1994-1996 Q45 uses a non-transponder key, the immobilizer module for 1995-1996 models still requires a security handshake to allow the engine to run. This initialization process requires a specialized diagnostic tool, such as the dealer's CONSULT-II scanner. An automotive locksmith with advanced diagnostic equipment may also be able to perform this service. Replacing the standard Keyless Entry Module (2859467U00) may not affect the immobilizer, but given the integration of these systems, it is safest to assume professional programming will be needed.
Buying a Used Vehicle Access Control Module
Since new OEM modules are largely discontinued, a quality used OEM part is the most common replacement option. Here’s what to look for:
- Match the Part Number Exactly: There are two main modules for this vehicle. Ensure you are buying the correct one. `2859467U00` is the Keyless Entry Module, while `2859567U00` is the Ignition Immobilizer Module. Do not interchange them.
- Inspect for Corrosion: Ask the seller for clear photos of the connectors. Any signs of water damage, rust, or green/white corrosion on the pins are major red flags.
- Check the Casing: Look for any signs that the module's case has been opened, which might indicate a failed repair attempt.
- Understand the Programming Cost: Factor in the cost of having the used module programmed by a dealer or locksmith. This is a hidden cost that is absolutely necessary for immobilizer-related modules.
- Why Used OEM is a Good Choice: For an electronic part like this, a used OEM module that has been tested and is known to be functional is often more reliable than a new, unproven aftermarket part, which may not exist for a vehicle of this age anyway.
Replacement Location
The location of the module depends on the part number:
- Keyless Entry Module (2859467U00): Located in the trunk, behind the passenger side (RH) quarter panel trim.
- Body Control Module (BCM): While a different part, it's often confused with the access module. The BCM is located on the driver's side, behind the instrument panel near the steering column.
- Ignition Immobilizer Module (28595-67U00): Often located near the BCM or steering column. On similar models, it is found behind the driver's side lower knee panel.
Cost to Replace
| Part/Service | Estimated Cost |
|---|---|
| New OEM Module | $500+ (Largely discontinued) |
| New Aftermarket Module | Not Generally Available |
| Used OEM Module | $50 - $150 |
| Shop Labor (Physical Swap) | $100 - $200 (1-1.5 hours) |
| Shop Labor (Programming) | $100 - $250 (Requires special tools) |
Frequently Asked Questions (FAQ)
Do I need to take my car to the INFINITI dealer to replace this module?
For the Ignition Immobilizer Module, you will need to take it to a dealer or a qualified automotive locksmith who has the specific equipment (like a CONSULT-II) to program the module to your car. A standard mechanic shop will likely not be able to perform the necessary security initialization.
Can I just program a new key fob to fix my lock problems?
Sometimes. If the module is still functional and the only issue is that your fob has lost its programming, you can try the DIY reprogramming procedure first. If the procedure doesn't work or the locks still behave erratically, the module itself is likely faulty.
Will a module from a 1997 Q45 work in my 1995 Q45?
No, you must match the part number exactly. The electronic systems, especially the anti-theft components, changed over the years. Using an incorrect module will likely result in it not working at all. The 1997 and newer models use a transponder key system, which is different from the 1994-1996 models.
My doors lock and then unlock by themselves. Is this the module?
It's a strong possibility. This behavior often points to a logic failure in the control module. However, it can also be caused by a faulty door lock actuator or a bad door pin switch that is incorrectly telling the module a door is still open. A full diagnosis is recommended before replacing parts.
Technical Specifications
OEM Part Numbers: 2859467U00 2859567U00
Controls keyless entry and/or vehicle immobilizer functions. Operates as part of the Nissan Anti-Theft System (NATS).
We Have This Part in Stock
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 Q45:
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- Symptoms of a Failing Access Control Module
- Known Issues, TSBs, and Recalls
- Programming and Installation Requirements
- Programming a Key Fob for Door Locks ONLY
- Replacing the Module Itself
- Buying a Used Vehicle Access Control Module
- Replacement Location
- Cost to Replace
- Frequently Asked Questions (FAQ)
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