Ford Ecosport: Multifunction Electronic Modules / Description and Operation - Module Controlled Functions - System Operation and Component Description

System Operation

BCM

The BCM controls various systems by monitoring inputs from switches, sensors and network messages from other modules on the HS-CAN and from the GWM . Based on the inputs received, the BCM activates outputs. For example, the BCM monitors the headlamp switch position. Based on this input, the BCM may provide voltage to the exterior lamps.

Battery Saver

The battery saver feature is uses to save battery voltage. The BCM provides automatic shut-off of the interior lamps after a time-out period when the ignition is off.

For more information regarding the interior lighting battery saver feature,
Refer to: Interior Lighting - System Operation and Component Description (417-02 Interior Lighting, Description and Operation).

Battery Load Shed

The BCM uses the battery current sensor to keep track of the battery state of charge in order to save the remaining battery charge when necessary.

For more information regarding the battery load shed feature,
Refer to: Charging System - System Operation and Component Description (414-00 Charging System - General Information, Description and Operation).

Field Effect Transistor (FET) Protection

A Field Effect Transistor (FET) is a type of transistor that, when used with module software, monitors and controls current flow on module outputs. The Field Effect Transistor (FET) protection strategy prevents module damage in the event of excessive current flow.

The BCM utilizes a Field Effect Transistor (FET) protective circuit strategy for many of its outputs (for example, a headlamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected. A short circuit DTC is stored at the fault event and a cumulative counter is started.

When the demand for the output is no longer present, the module resets the Field Effect Transistor (FET) circuit protection to allow the circuit to function. The next time the driver requests a circuit to activate that has been shut down by a previous short (Field Effect Transistor (FET) protection) and the circuit is still shorted, the Field Effect Transistor (FET) protection shuts off the circuit again and the cumulative counter advances.

When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. Each Field Effect Transistor (FET) protected circuit has 3 predefined levels of short circuit tolerance based on the harmful effect of each circuit fault on the Field Effect Transistor (FET) and the ability of the Field Effect Transistor (FET) to withstand it. A module lifetime level of fault events is established based upon the durability of the Field Effect Transistor (FET). If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.

When each tolerance level is reached, DTC U1000:00 should set along with the short circuit DTC that was stored on the first failure. These Diagnostic Trouble Codes (DTCs) cannot be cleared until the vehicle is repaired.

After the repair, it is necessary to clear the Diagnostic Trouble Codes (DTCs). Use the clear DTC operation on the scan tool, cycle the ignition, and run the BCM on-demand self-test.

The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur. If the number of short circuit fault events reach the third level, DTC U3000:49 sets along with the associated short circuit DTC . DTC U3000:49 cannot be cleared and the module must be replaced after the initial fault is repaired.

Post Crash Alert Function

The post crash alert is a function controlled by the BCM . If the RCM determines an impact of enough severity has occurred (the air bags may or may not be deployed), the post crash alert function activates.

The post crash alert function:

• sounds the horn.
• turns on the interior lights.
• unlocks the doors.

The post crash alert function can be turned off by:

• pressing the hazard flasher lamp switch (which may need to be pressed twice).
• pressing the RKE transmitter unlock button.
• pressing the RKE transmitter panic button.

Factory-Transport Mode

During vehicle build, some modules (such as the IPC and the BCM ) are set to factory mode. When the vehicle build is complete, the vehicle is set to transport mode.

Transport mode is used to reduce the drain on the battery during long periods when the vehicle is not used. Various system functions can be altered or disabled when in the transport mode. While in transport mode, the IPC displays TRANSPORT MODE in the message center. Transport mode can be disabled and placed into normal operation mode.
Refer to: Transport Mode Deactivation (419-10 Multifunction Electronic Modules, General Procedures).

Component Description

Body Control Module (BCM)

The BCM is a multifunction module that requires a PMI when replaced.
Refer to: Module Configuration - System Operation and Component Description (418-01 Module Configuration, Description and Operation).

DDM or PDM

The DDM and PDM receive user inputs to lock or unlock the power door locks then sends this request to the BCM . The BCM provides the power to actuate the latch. The DDM and PDM control the operation of the power windows, the exterior rear view mirrors and the operation of the BLIS LED . They communicate with each other, the BCM , GWM and other modules over the MS-CAN .

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  Refer to: Handles, Locks, Latches and Entry Systems - System Operation and Component Description (501-14 Handles, Locks, Latches and Entry Systems, Description and Operation).
  
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  Refer to: Glass, Frames and Mechanisms - System Operation and Component Description (501-11 Glass, Frames and Mechanisms, Description and Operation).
  
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  Refer to: Rear View Mirrors - System Operation and Component Description (501-09 Rear View Mirrors, Description and Operation).
  

The DDM and PDM require PMI when replaced.
Refer to: Module Configuration - System Operation and Component Description (418-01 Module Configuration, Description and Operation).

For additional information regarding the one-touch up feature learn procedure,
Refer to: Power Door Window Initialization (501-11 Glass, Frames and Mechanisms, General Procedures).