2010 Lexus LS460 & LS600h Body Control Module: A Guide to Part Numbers and Programming
This guide covers the common electrical failures, symptoms, and critical programming steps required when replacing the Body Control Module in your 2010 Lexus LS460 or LS600h.
- A replacement Body Control Module is NOT plug-and-play; it absolutely requires programming by a dealer or specialist with Toyota Techstream software to start the vehicle.
- This specific module (part #89990-50160) fits vehicles produced up to January 2010. Always verify your original part number before buying a replacement.
- Common failure symptoms are widespread electrical issues, including erratic lights, malfunctioning windows/locks, and a parasitic battery drain that kills the battery.
- The BCM is located behind the driver's side lower dash, near the knee airbag, making replacement a job for experienced mechanics.
Compatibility Warning: Read This First
Warning: This Body Control Module has extremely specific vehicle fitment. Failure to match the part number and production date range will result in a part that does not work. Before purchasing, verify the following:
- Production Date: The primary OEM part number, 89990-50160, is specified for vehicles produced up to January 2010. Always verify the part number on your original module before ordering a replacement.
- Part Number Match: You must match the OEM part number exactly. This module is part of a supersession chain, meaning Lexus has released updated versions over time. Any of the numbers in this chain should be compatible, but it is always safest to match your original number. See the full list of part numbers in the 'Technical Specifications' section below.
Symptoms of a Failing Body Control Module
A failing BCM can cause a wide range of confusing and seemingly unrelated electrical problems. Because it controls so many different systems, symptoms can appear throughout the vehicle. Common signs of failure include:
- Erratic Interior and Exterior Lights: Headlights, taillights, or interior lights may flicker, stay on when the car is off, or not turn on at all.
- Power Window and Lock Malfunctions: Power windows, door locks, and side mirrors may work intermittently or stop responding completely.
- Security System and Key Fob Issues: The factory alarm may trigger for no reason, or the keyless entry remote may stop working. This can lead to a no-start condition if the BCM fails to recognize the key.
- Persistent Battery Drain: A faulty BCM can fail to shut down certain electrical circuits when the car is off, leading to a dead battery over a few hours or days (a parasitic draw).
- Dashboard Warning Lights: You may see multiple, unrelated warning lights illuminate on the instrument cluster, sometimes described as a "Christmas tree" effect.
- Vehicle Will Not Start: In cases of complete failure, the BCM may not communicate with the immobilizer system, preventing the engine from cranking or starting.
A professional scan tool may retrieve body codes (starting with 'B') or network codes (starting with 'U'). The most common fault code associated with a failing BCM is U0140 - Lost Communication With Body Control Module.
Programming and Immobilizer: The Critical Step
Warning: A replacement Body Control Module, whether new or used, is NOT a plug-and-play part. It must be programmed to your vehicle's specific VIN and security information.
If you install a replacement module without programming, the car's immobilizer will activate, and the engine will not start. This programming process syncs the 'new' module with the vehicle's keys and other control units. This requires specialized software and hardware.
You have three main options for programming:
- Lexus Dealership: The dealer can program a new or used BCM to your vehicle. This is the most straightforward but often most expensive option.
- Independent Repair Shop: Many independent shops that specialize in Lexus or Japanese vehicles have the necessary Toyota Techstream software to perform the programming.
- Mail-In Cloning Service: You can remove your original BCM and the used replacement and mail them to a service that will clone the data from your old module to the new one. When the modules are returned, the replacement will be plug-and-play. This is a good option if you can have the vehicle down for several days.
Buying a Used Body Control Module
Purchasing a used OEM Body Control Module is a cost-effective way to solve electrical issues, provided you take the right steps. Given the mandatory programming, here’s what to look for:
- Verify the Part Number: Before you buy, remove your original BCM to confirm the exact part number printed on its label. Match it to the used part you intend to buy. The primary number is 89990-50160, but it has been superseded by several newer numbers (see list below).
- Check the Production Date Window: Be aware of the January 2010 production date cutoff. Ensure the part you are buying is from a vehicle that matches your own.
- Inspect for Damage: When you receive the used module, inspect it for any signs of physical damage, especially corrosion from water intrusion or burnt plastic smells, which indicate internal failure.
- Budget for Programming: Remember that the cost of the part is not the total cost. You must factor in the additional expense of having the module programmed by a dealer or independent shop.
Known Issues, TSBs, and Recalls
As of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from Lexus or the NHTSA that directly name the Main Body ECU for the 2010 LS460 or LS600h. However, many owner complaints about widespread electrical issues are consistent with BCM failure.
It is important not to confuse this part with the Steering Control ECU, which was subject to a recall (NHTSA ID: 10V230000) on some 2010 models for an issue with the steering wheel becoming off-center. This is a completely separate component and issue.
Replacement Location
The Main Body ECU is located behind the driver's side lower dashboard, to the left of the steering column. Access requires removing the lower dash panel and the knee bolster assembly.
Warning: The driver's side knee airbag is located in this area. Disconnect the vehicle's 12V battery and wait at least 90 seconds before beginning work to prevent accidental deployment. This job is recommended for experienced DIY mechanics or professionals due to the location and safety risks.
Cost Comparison
The cost to replace the BCM can vary significantly based on the source of the part and local labor rates.
| Part/Service | Estimated Cost | Notes |
|---|---|---|
| New OEM Part | $1300 - $1600+ | Purchased from a Lexus dealership parts counter. |
| Used OEM Part | $150 - $500 | Price varies based on condition and seller. |
| Remanufactured Part | $200 - $450 | Availability may be limited for this specific model. |
| Shop Labor (Installation & Programming) | $250 - $500 | Typically 1.5-3 hours of labor. Diagnosis is often a separate charge. |
Frequently Asked Questions (FAQ)
Can I drive my LS460 or LS600h with a bad Body Control Module?
It is not recommended. A failing BCM can cause critical systems like headlights, taillights, or wipers to fail without warning, creating a safety hazard. If the failure affects the immobilizer, your car may not start, leaving you stranded.
Can I replace the BCM myself?
Physically swapping the module is possible for an experienced DIY mechanic, but it involves working around the driver's knee airbag. However, the vehicle will be completely disabled and will not start until the replacement module is programmed with dealer-level software, so a trip to a dealer or specialist shop is unavoidable.
Will a BCM from a different Lexus model work?
No. You must use a module with the exact same part number from an identical vehicle (LS460 or LS600h from the correct year range). Even if the part looks the same and plugs in, internal hardware and software differences will prevent it from functioning correctly.
My battery keeps dying. Could it be the BCM?
Yes, a parasitic battery drain is a very common symptom of a bad BCM. The module may fail to put other electronic components to 'sleep' when the car is turned off, causing a slow drain on the battery. Before replacing the BCM, it's wise to have a mechanic perform a parasitic draw test to confirm the source of the drain.
Technical Specifications
OEM Part Numbers: 89990-50160 89990-50161 89990-50162 89990-50163 89990-50164 89990-50165
Also known as Main Body ECU or Smart Key Computer Assembly. Controls various non-engine electrical functions. Requires VIN-specific programming and synchronization with the vehicle immobilizer system.
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.
- Lexus LS460:
- Lexus LS600h: