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Multifunction Electronic Modules: Overview Ford Fiesta Mk6

Communication Devices ~1265 words

Principles of Operation

The Body Control Module (BCM) controls various systems by monitoring inputs from switches, sensors and messages sent over the Medium Speed Controller Area Network (MS-CAN) from other modules. The BCM activates outputs based on the inputs received. For example, the BCM monitors the headlamp switch position, and based on this input, the BCM may provide voltage to the exterior lamps.

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 FET protection strategy prevents module damage in the event of excessive current flow.

The BCM utilizes a FET protective circuit strategy for many of its outputs (such as a turn lamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down when a fault event is detected. A short circuit DTC sets when the fault event occurs.

The circuit remains off until the fault is corrected and the ignition state is cycled off and then back on, the module resets the FET protection and allows the circuit to function.

Normal Operation

  1. DTC P1397:00 (System Voltage Out Of Self Test Range: No Sub Type Information) - an on-demand DTC that sets when the Body Control Module (BCM) detects voltage below 10 volts or above 15.5 volts from either voltage supply circuit to BCM C2280A-8 or BCM C2280A-14.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. High circuit resistance
  3. Charging system concern
  4. BCM
  1. DTC U0121:00 (Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information) - sets in the Body Control Module (BCM) if data messages received from the ABS module are missing. For a complete list of all network messages, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. ABS module
  3. BCM
  1. DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information) - sets in the Body Control Module (BCM) if data messages received from the Instrument Panel Cluster (IPC) are missing. For a complete list of all network messages, refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. IPC
  3. BCM
  1. DTC U0167:00 (Lost Communication With Vehicle Immobilizer Control Module: No Sub Type Information) - sets in the Body Control Module (BCM) if data messages received from the Remote Function Actuator (RFA) module are missing. For a complete list of all network messages, refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. RFA module
  3. BCM
  1. DTC U0257:00 (Lost Communication With Front Controls/Display Interface Module: No Sub Type Information) - sets in the Body Control Module (BCM) if data messages received from the Front Control/Display Interface Module (FCDIM) are missing. For a complete list of all network messages, refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. FCDIM
  3. BCM
  1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - sets in the Body Control Module (BCM) when the BCM detects that battery voltage has dropped below 9 volts from the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. High circuit resistance
  3. BCM
  1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - sets in the Body Control Module (BCM) when the BCM detects that battery voltage exceeds 15.9 volts on the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Charging system concern
  2. BCM

The Remote Function Actuator (RFA) module is only on vehicles equipped with the Intelligent Access (IA) feature. On vehicles equipped with this option, the RFA controls the IA and related entry/anti-theft systems (such as the power door locks and luggage compartment/liftgate release). The RFA module communicates on the High Speed Controller Area Network (HS-CAN) and the Medium Speed Controller Area Network (MS-CAN). The RFA module controls the following functions

  1. IA feature
  2. Ignition states
  3. Passive Anti-Theft System (PATS)
  4. Remote Keyless Entry (RKE) system
  1. DTC P0560:16 (System Voltage: Circuit Voltage Below Threshold) - sets in the Remote Function Actuator (RFA) module when the RFA module detects that battery voltage has dropped below 9 volts (for more than 10 seconds) from the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. High circuit resistance
  3. RFA module
  1. DTC P0560:17 (System Voltage: Circuit Voltage Above Threshold) - sets in the Remote Function Actuator (RFA) module when the RFA module detects that battery voltage exceeds 16 volts from the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Charging system concern
  2. RFA module
  1. DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages (engine speed) received from the PCM are missing. For a complete list of all network messages, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. PCM
  3. RFA module
  1. DTC U0101:00 (Lost Communication with TCM: No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages received from the Transmission Control Module (TCM) over the High Speed Controller Area Network (HS-CAN) are missing.

This pinpoint test is intended to diagnose the following

  1. TCM
  2. RFA module
  1. DTC U0121:00 (Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages received from the ABS module are missing. For a complete list of all network messages, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. ABS module
  3. RFA module
  1. DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages received from the Body Control Module (BCM) are missing. For a complete list of all network messages, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. RFA module
  3. BCM
  1. DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information) - sets in the Remote Function Actuator (RFA) module if data messages received from the Instrument Panel Cluster (IPC) are missing. For a complete list of all network messages, refer to «MODULE COMMUNICATIONS NETWORK»(ref-382388) .

This pinpoint test is intended to diagnose the following

  1. Communication network concern
  2. RFA module
  3. IPC
  1. DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - sets in the Remote Function Actuator (RFA) module when the RFA module detects that battery voltage has dropped below 9 volts (for more than 10 seconds) from the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. High circuit resistance
  3. RFA module
  1. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - sets in the Remote Function Actuator (RFA) module when the RFA module detects that battery voltage exceeds 16 volts from the voltage supply circuit.

This pinpoint test is intended to diagnose the following

  1. Charging system concern
  2. RFA module
  1. DTC U3003:62 (Battery Voltage: Signal Compare Failure) - a continuous and on-demand DTC that sets when the RFA module detects a difference of 2 volts between the voltage supply circuit and a message (voltage value) received from the PCM over the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. High circuit resistance
  3. Charging system concern
  4. RFA module

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