Network Message Chart
BCM Network Input Messages
Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
Headlamp flash to pass status | GWM | Indicates to the BCM a request for the high beams or flash- to-pass. |
GWM Network Input Messages
Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
Headlamp flash to pass status | SCCM | Indicates to the GWM a request for the high beams or flash- to-pass. |
Low Beams
The BCM monitors the headlamp switch position by sending voltage signals on multiple circuits to the headlamp switch. There is one circuit for each headlamp switch position. At any given time, one of the signal circuits is switched to ground to indicate the headlamp switch position.
The BCM turns the parking lamps and headlamps on when the ignition is in RUN and the BCM detects a fault from the headlamp switch or wiring. This is normal behavior of the BCM when a fault has been detected with the inputs from the headlamp switch.
The BCM supplies a high current switched voltage to the headlamp assemblies to supply the necessary current to operate the ballast and lamps.
High Intensity Discharge (HID) headlamps utilize a ballast, mounted to each headlamp assembly, to provide the necessary voltage to illuminate the High Intensity Discharge (HID) bulbs.
The BCM also provides an Field Effect Transistor (FET) protection of the exterior lamps switched voltage and low beam output circuits. When an excessive current draw is detected, the BCM disables the affected circuit driver.
Refer to: Module Controlled Functions - System Operation and Component Description (419-10 Multifunction Electronic Modules, Description and Operation).
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.