Multifunction Electronic Modules -- Electric: Other Ford Focus III

Body Control Module

The BCM controls

1. Battery saver function
2. Brake shift interlock
3. Delayed accessory function
4. Dimmable backlighting
5. Exterior lighting
6. Ignition state messaging
7. Interior lighting
8. Key validation (part of PATS )
9. Liftgate release
10. PATS (without Intelligent Access (IA))
11. Perimeter alarm
12. Power door locks (vehicles without door module)
13. Post crash alert function
14. RKE system (without Intelligent Access (IA))
15. TPMS
16. Transport mode

Remote Function Actuator Module

The RFA module controls

1. Intelligent Access (IA) function
2. Key validation (part of PATS )
3. PATS
4. RKE signals (output controlled by the BCM )

Battery Saver

Note. Time-out is 10 seconds if the vehicle is in factory mode or 0 seconds if the vehicle is in transport mode.

The BCM provides automatic shut-off of the courtesy and demand lamps after a time-out period when the ignition is OFF. A timer in the BCM starts when

1. the ignition transitions to OFF.
2. any door or liftgate/luggage compartment lid becomes ajar.
3. an unlock button of the RKE transmitter is pressed.
4. a door is unlocked using a key.
5. the door lock switch is pressed.

When 10 minutes (30 minutes for demand lamps) have elapsed, the BCM automatically shuts off voltage to the lamps. The timer restarts (voltage is restored if the BCM is in battery saver mode) if

1. the ignition transitions out of OFF.
2. any door or liftgate/luggage compartment lid becomes ajar.
3. the unlock button of the RKE transmitter is pressed.
4. a door is unlocked using a key.
5. the door lock switch is pressed.

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

1. sounds the horn.
2. turns on the interior lights.
3. unlocks the doors.
4. turns off the wipers, if on.

The post crash alert function can be turned off by

1. pressing the hazard flasher lamp switch (which may need to be pressed twice).
2. pressing the transmitter unlock button.
3. pressing the RKE transmitter PANIC button.

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.

Gateway Function

The BCM acts as a gateway module by receiving information in one format and transmitting it to other modules using another format. For example, the BCM receives the vehicle speed data from the RCM over the High Speed Controller Area Network (HS-CAN), converts the data into a Medium Speed Controller Area Network (MS-CAN) message and sends (gateways) the message to other network modules such as the IPC module. This enables network communication between modules that do not communicate using the same network (High Speed Controller Area Network (HS-CAN) or Medium Speed Controller Area Network (MS-CAN)).

Note. The gateway module and IPC also have gateway functionality.

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 longer 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 and Factory Mode Deactivation (419-10 Multifunction Electronic Modules).

Body Control Module (BCM)

The BCM is a multifunction module that requires a Programmable Module Installation (PMI) when replaced.

Refer to: MODULE CONFIGURATION - SYSTEM OPERATION AND COMPONENT DESCRIPTION (418-01 Module Configuration, Description and Operation).

Remote Function Actuator (RFA) Module

The RFA module is a multifunction module that requires a Programmable Module Installation (PMI) when replaced.

Refer to: MODULE CONFIGURATION - SYSTEM OPERATION AND COMPONENT DESCRIPTION (418-01 Module Configuration, Description and Operation).

Possible Sources

1. BCM
2. PCM

1. Battery
2. PCM

1. BCM
2. TCM

1. BCM
2. ABS Module

1. BCM
2. PSCM

1. BCM
2. RCM

1. BCM
2. IPC

1. BCM
2. HVAC module

1. BCM
2. DDM

1. BCM
2. PDM

1. BCM
2. RFA module

1. BCM

1. Wiring, terminals or connectors
2. BCM

1. Wiring, terminals or connectors
2. BCM

1. Wiring, terminals or connectors
2. BCM

1. Charging system
2. BCM

1. Wiring, terminals or connectors
2. BCM
3. RCM

1. Wiring, terminals or connectors
2. BCM
3. PCM

1. BCM
2. RFA module

1. Wiring, terminals or connectors
2. Battery
3. Generator
4. PCM
5. RFA module

Deactivation