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
| Refer to COMPONENT INDEX . |
When the DAB trim cover is pressed, the closed horn switch circuit provides a ground signal to the BCM, which then, using a LSD, pulls the control coil of the horn relay located within the PDC to ground. The horn relay then controls the output to the horns accordingly.
Inputs:
- Horn request from horn switch
- Accessory blink request; FOBIK safe unlock all request
- Remote start chirp
- Panic request; FOBIK RF request
- IPC setup for horn sound during lock and remote start
- Alarm system horn request
Outputs:
- Horn command to horn relay
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.