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Wiper System & Washer System: Overview Ford Fiesta Mk6

Wiper/washer Systems ~1202 words

Normal Operation

Power is supplied from the Central Junction Box (CJB) to the Body Control Module (BCM) for the front wiper system when the ignition is in the ON position. The BCM supplies a signal voltage(s) to the wiper/washer switch for the HIGH speed, LOW speed, and INTERMITTENT functions. Each function has its own dedicated signal (sense) voltage. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM then reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out. Ground is supplied to the wiper motor through a circuit that is shared by the BCM windshield wiper return circuit.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Windshield wiper motor
  4. Wiper/washer switch
  5. BCM

Power is supplied from the Central Junction Box (CJB) to the Body Control Module (BCM) for the rear window wiper system when the ignition is in the ON position. The BCM supplies a signal voltage(s) to the wiper/washer switch for the CONTINUOUS and INTERMITTENT wiper functions. Both functions share a dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM then reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out (depending on the windshield wiper setting). Ground is supplied to the rear window wiper motor through its own dedicated circuit.

This pinpoint test is intended to diagnose the following

  1. Fuse(s)
  2. Wiring, terminals or connectors
  3. Wiper/washer switch
  4. Rear window wiper motor
  5. BCM

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for the HIGH speed, LOW speed, and INTERMITTENT functions. Each function has its own dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM then reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Wiper/washer switch
  3. Windshield wiper motor
  4. BCM

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for the CONTINUOUS and INTERMITTENT wiper functions. Both functions share a dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM then reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out (depending on windshield wiper setting).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Wiper/washer switch
  3. Rear window wiper motor
  4. BCM

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for the HIGH speed, LOW speed, and INTERMITTENT functions. Each function has its own dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out. The wiper/washer switch has a rheostat (variable resistor) which, when moved, changes the time delay between wipes. The BCM monitors the position of the rheostat through a sense line.

  1. DTC B1008:92 (Wiper Mode Switch: Performance or Incorrect Operation) - Sets when the INTERMITTENT mode is grounded at the same time as the LOW and/or HIGH speed functions for more than 2 seconds.
  2. DTC B1C53:13 (Front Wiper Intermittent Data; Circuit Open) - Sets when the front interval potentiometer input circuit is open.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Wiper/washer switch
  3. Windshield wiper motor
  4. BCM

The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for CONTINUOUS and INTERMITTENT wiper functions. Both functions share a dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage(s) when a function is selected. The BCM reacts to the grounded signal voltage(s) and its integral electronics make a decision on which wiper system function to carry out (depending on the windshield wiper setting).

  1. DTC B11DC:92 (Rear Wiper Mode Switch: Performance or Incorrect Operation) - Sets during self-test when the rear wiper interval switch circuit is grounded.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Wiper/washer switch
  3. Rear window wiper motor
  4. BCM

The front and rear washer systems share the same washer pump motor. The Body Control Module (BCM) supplies a signal voltage(s) to the wiper/washer switch for the front/rear wash functions. Each function has its own dedicated signal (sense) line. The wiper/washer switch physically grounds the signal voltage when a wash function is selected. The BCM reacts to the grounded signal voltage(s) and its integral electronics make a decision on what polarity to supply the washer pump motor with. The BCM changes the polarity to the washer pump motor in reaction to a front or rear wash selection, changing the rotational direction of the motor.

  1. DTC B1051:92 (Front Washer Switch: Performance or Incorrect Operation) - Sets during self-test when the wiper/washer switch front washer circuit to the BCM or the front washer pump circuit is grounded.
  2. DTC B1052:92 (Rear Washer Switch: Performance or Incorrect Operation) - Sets during self-test when the wiper/washer switch rear washer circuit to the BCM or rear washer pump circuit is grounded.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Wiper/washer switch
  3. Washer pump
  4. BCM

Integral to the wiper motor is a set of contacts that only close when the wipers are in the PARK position. When closed the contacts supply ground to the Body Control Module (BCM) which uses the ground to sense when the wipers are in the PARK position. If the wipers are in use, the BCM continues to supply power to the wiper motor after the wipers are commanded OFF and in a NON-PARK position. Once the wipers are in the PARK position, the BCM removes power from the wiper motor and the wipers remain PARKED.

  1. DTC B1C45:24 (Front Wipe Position Switch: Signal Stuck High) - Sets during self-test when the wipers are not initially PARKED or are still PARKED after 500 ms with the wiper/washer switch set to LOW SPEED. Also sets while being continuously monitored when the wiper/washer switch is set to SINGLE WIPE or INTERMITTENT and the wipers remain PARKED for longer than 1.5 seconds or when the wiper/washer switch is set to OFF and the wipers remain in a NON-PARKED position for longer than 12 seconds.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Linkage
  3. Windshield wiper motor
  4. BCM

Integral to the wiper motor is a set of contacts that only close when the wipers are in a NON-PARK position. The Body Control Module (BCM) supplies power to the wiper motor as long as the contacts are closed or the wipers are in a NON-PARK position. When the wipers are commanded OFF during use, the BCM continues to supply the wiper motor with power until the contacts open when the PARK position is reached.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Rear window wiper motor
  3. BCM

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