2006-2008 Subaru Forester Keyless Entry Module: Solving Fob & Alarm Issues
This guide covers the common failures, replacement, and DIY programming for the keyless entry and security module in your 2006-2008 Subaru Forester.
- This part is a specialized Keyless Entry Module, not a full Body Control Module (BCM). Its failure primarily affects remote fobs and the alarm.
- A replacement module is plug-and-play, but you MUST reprogram your key fobs to the new module. This is a DIY procedure.
- Before replacing the module, always install a fresh battery in your key fob, as this is the most common cause of remote failure.
- Verify the part number is 88035SA140 when buying a used replacement to ensure compatibility.
Symptoms of a Failing Keyless Entry Module
When the keyless entry module in a 2006-2008 Forester begins to fail, the symptoms are usually related to the remote fobs and the alarm. Because this module is not a full BCM, you are less likely to see widespread electrical issues like faulty wipers or headlights. Look for these specific signs:
🎬 Watch: How to identify and test a failing control module- Key Fobs Stop Working: One or both key fobs may suddenly stop locking or unlocking the doors, even after replacing the fob's battery.
- Reduced Remote Range: You may have to stand much closer to the vehicle than before for the key fob to work.
- Intermittent Operation: The fobs may work sometimes but not others, requiring multiple button presses to get a response.
- Factory Alarm Issues: The security alarm may trigger randomly for no reason or may not arm/disarm correctly when using the fob.
- Inability to Program New Fobs: If you try to program a new or existing key fob, the vehicle may not enter programming mode, which is a sign the module itself is faulty.
Pro Tip: Before suspecting the module, always replace the battery in your key fob first. A weak battery is the most common cause of key fob problems and is a simple, inexpensive fix.
Buying a Used 2006-2008 Forester Keyless Entry Module
For this specific part, a used OEM module is an excellent and cost-effective choice. New OEM modules can be expensive, and aftermarket options are not common.
Key Considerations:
- Verify the Part Number: Ensure the used module you are buying has the part number 88035SA140. While other modules may look similar, only the correct part number will work with your vehicle's systems.
- Plug-and-Play Installation: The module itself does not require programming to the vehicle's VIN or main computer. It is a direct replacement that can be swapped in without special dealer tools.
- DIY Fob Reprogramming is Required: After installing the replacement module, your existing key fobs will not work until they are programmed to the 'new' module. This is a simple procedure you can do yourself in a few minutes.
How to Program Your Key Fobs to the New Module
You will need the 8-digit ID code printed on a label inside each remote fob. A maximum of four remotes can be programmed.
- Get in the car and close all doors.
- Within 15 seconds, turn the ignition key from the LOCK to the ON position 10 times, ending in the LOCK position. The car will chime once to indicate it's in programming mode.
- Open and close the driver's door.
- Using the power lock switch on the driver's door, press the LOCK button the number of times corresponding to the first digit of your remote's ID code. (e.g., press LOCK 5 times for the number 5).
- Press the UNLOCK button on the door switch once.
- Repeat steps 4 and 5 for all eight digits of the remote's ID code, from left to right.
- After entering all eight digits, you must repeat the entire 8-digit entry process (steps 4 and 5) a second time to confirm.
- If successful, the car will chime, indicating the remote is programmed. Repeat the process for any additional remotes.
Known Issues, TSBs, and Recalls
There are no major recalls or widespread Technical Service Bulletins (TSBs) from Subaru specifically for the failure of the keyless entry module on the 2006-2008 Forester. Most issues are related to individual component failure over time. One recall for 2008 models concerned corrosion on the front lower control arms in certain states, which is unrelated to this module.
Replacement Cost Breakdown
The cost to replace the keyless entry module can vary significantly depending on the part source.
| Part Source | Estimated Cost |
|---|---|
| New OEM | $175 - $250 |
| Used OEM | $30 - $120 |
| Shop Labor | $60 - $180 (0.5-1.0 hours) |
Frequently Asked Questions (FAQ)
Does the 2006-2008 Forester keyless entry module need to be programmed by a dealer?
No, the module itself is plug-and-play and does not require dealer programming. However, you must reprogram your existing key fobs to the new module, which you can do yourself at home using the procedure outlined in this guide.
Where is the keyless entry module located?
The keyless entry module is typically located high up in the dashboard, often behind or above the glove box area. Access usually involves removing the glove box assembly to reach the module and its electrical connectors.
Is this module the same as the immobilizer?
No. The keyless entry module (88035SA140) handles the remote door locks and alarm. The immobilizer is a separate system that reads a chip inside your ignition key to allow the engine to start. A failure of the keyless entry module will not prevent your car from starting and driving.
Will a replacement module fix my key fob?
If the module is faulty, then yes, a replacement will restore function once your fobs are reprogrammed to it. However, always check the simple things first: replace the battery in the key fob and inspect the fob for physical damage (like from being dropped or getting wet).
Helpful Videos
Technical Specifications
OEM Part Numbers: 88035SA140
Controls keyless entry and factory anti-theft alarm system. Can be programmed with up to 4 remotes.
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.
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