The car's complex system is composed of several key components, each playing a crucial role in its overall functionality. These major composites include the external system, which encompasses the body, the drive train consisting of the engine, gearbox, and axles, and the intricate electrical network that links both the body and the drivetrain functionalities.
Each of these composites and their respective sub-components are governed by specialized modules. These modules act as the brainpower behind the scenes, ensuring the smooth and efficient operation of each department.
The Body Control Module (BCM) serves as the central nervous system (CNS) of the vehicle. Much like the CNS controls and coordinates the various functions of the human body, the BCM oversees the functionalities of all the visible parts and conveniences you enjoy from the moment you enter the car until you're comfortably seated and ready to embark on your journey.
From managing the door locks, windows, and interior lights to coordinating with the drivetrain for optimal performance, the BCM plays a pivotal role in enhancing the driving experience. Its seamless integration with the electrical network ensures that you can enjoy the full range of comforts and conveniences that modern vehicles have to offer.
However, a breakdown in this body control module will lead to the following symptoms
1. Malfunctioning Interior and Exterior Lights.
That is, You noticed that your Lights are not turning on, or off as expected, and lights like your automatic automatic headlights or interior lighting, not work correctly.
Or.
2. Loss of Vehicle Features and Convenience Functions:
Features like automatic wipers, power mirrors, and seat adjustments may not work or may operate erratically.
Convenience functions like memory settings for seats and mirrors may not be accessible.
3. Defective Power Windows and Door Locks.
Power windows may not open or close as expected, and you notice that Central locking system are not operating properly, preventing doors from locking or unlocking as at when desired.
Or.
4. Malfunctioning Instrument Cluster.
Where your gauges and indicators on the instrument cluster are not displaying accurate information or may not work at all.
And you see Warning lights related to the BCM illuminate on the dashboard.
Like door Door Ajar Warning Light such that Even if all doors are closed, the vehicle will be indicating that one or more doors are opened.
Or Seatbelt Warning Light such that The seatbelt reminder keeps showing even if seatbelts are properly fastened.
Or Airbag Warning Lights showing on dashboard even when airbag is intact.
You can also see other warning lights like
brake, engine management/check engine, stability control/traction control, security system, and exterior light malfunction indicators.
One would wander why these happens? Well, While the BCM primarily controls the car body mechanisms, it can affect these systems due to shared communication lines or secondary issues.
The symptoms can go on and on to include even tire pressure display when not needed, battery charging warning light, brake warning lights, climate control not working well, Electrical glitches, and remote and key less entry malfunction.
The worst of these symptoms is not allowing your car to crank nor start, and the most frustrating one, is parasitic battery draining, Where you wake up to drained battery almost everytime, even when your alternator is working optimally, your car battery consistently well charged, and you are sure to have turned every light off before sleeping.
All these symptoms relate to the U0140. Frankly speaking, we could spend the remaining part of this video explaining just the symptoms alone without exhausting them.
So in this video, we are just going to dirve straight into the U0140 error code, it's causes, and quickest solution. Please watch to the end.