Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Body Control Module (BCM)
The body control module (BCM) is a class 2 device utilizing digital serial data links with other control modules. The BCM contains the EPM software and communicates with the ECM/PCM and the instrument panel cluster for EPM operation. The BCM determines the desired output voltage of the generator and sends the voltage command to the ECM/PCM for transmittal via the "L" terminal line to the regulator. The BCM also monitors the generator field duty cycle signal (F terminal) sent via the ECM/PCM. The BCM monitors the battery current sensor, the battery positive voltage, and estimated battery temperature to determine SOC. The BCM commands idle boost and load management operations, whenever battery discharge warrants it.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.