The body control module is an electronic control unit that coordinates non-engine electrical systems in a vehicle. It acts as a central hub for functions like power windows, central locking, interior lighting, windshield wipers, and the immobilizer. It communicates with other modules over the CAN bus network, reducing the need for heavy, complex physical wiring between individual switches and relays.
The wipers won't shut off and the dome light is flashing, so I'm pulling the codes on the body control module.
When diagnosing strange, unrelated electrical gremlins occurring simultaneously, water intrusion into the BCM is a prime suspect.
Also heard as
- BCM
Related terms
ECU
The primary computer that manages engine performance, fuel delivery and emissions.
ECM
The electronic control module that manages a vehicle's engine and sometimes transmission.
CAN
A controller area network bus that allows vehicle microcontrollers and devices to communicate.
Wiring harness
An organized bundle of insulated electrical cables and connectors that routes power and data throughout a vehicle.