Wiper System & Washer System: Overview Ford Flex I

Normal Operation

When the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the front wiper relay coil through circuit CBP45 (YE). The front wiper relay coil is grounded at all times through circuit GD120 (BK/GN). Voltage is supplied to the front wiper relay through circuit SBB04 (GN/RD). When the front wiper relay is activated, voltage is supplied to the wiper motor through circuit CRW03 (VT/WH). The wiper motor is grounded through circuit GD120 (BK/GN). The multifunction switch is grounded through circuit GD114 (BK/BU). The multifunction switch sends open and ground input signals to the wiper motor through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW08 (VT/OG) in order to activate the wiper motor to the requested modes.

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Front wiper relay
3. Wiring, terminals or connectors
4. Multifunction switch
5. Windshield wiper motor

Under normal operation, when the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the Battery Junction Box (BJB) rear wiper relay coil through circuit CRW03 (VT/WH). The rear wiper relay coil is grounded at all times through circuit GD120 (BK/GN). High current voltage is supplied to the rear wiper relay through circuit SBB15 (WH/RD). When the rear wiper relay is activated it supplies voltage to the rear wiper motor through circuit CRW05 (BU). The rear window wiper motor is grounded through circuit GD149 (BK/GY). The rear window wiper motor receives open and ground inputs from the multifunction switch through circuits CRW20 (GY/YE) and CRW21 (YE/VT) to activate the wiper to the appropriate modes. The multifunction switch supplies a ground input to the rear wiper motor on circuit CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on circuits CRW21 (YE/VT) and CRW20 (GY/YE) when INT 2 is selected.

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. Multifunction switch
4. Rear window wiper motor
5. Rear wiper relay

Under normal operation, the windshield wiper motor receives open and ground inputs from the multifunction switch through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW08 (VT/OG) to activate the wipers to the appropriate speeds.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Multifunction switch
3. Windshield wiper motor
4. Front wiper relay

Under normal operation, the rear window wiper motor receives open and ground inputs from the multifunction switch through circuits CRW20 (GY/YE) and CRW21 (YE/VT) to activate the wiper to the appropriate modes. The multifunction switch supplies a ground input to the rear wiper motor on circuit CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on circuits CRW21 (YE/VT) and CRW20 (GY/YE) when INT 2 is selected.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Rear window wiper motor
3. Multifunction switch
4. Rear wiper relay

Under normal operation, the wiper motor receives open and ground inputs from the multifunction switch through circuits CRW08 (VT/OG), CRW17 (GN/VT) and CRW19 (BU/OG) to activate the wipers in the high and low speeds.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Windshield wiper motor
3. Multifunction switch

Under normal operation, the rear window wiper motor receives open and ground inputs from the multifunction switch through circuits CRW20 (GY/YE) and CRW21 (YE/VT) to activate the wiper to the appropriate modes. The multifunction switch supplies a ground input to the rear wiper motor on circuit CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on circuits CRW21 (YE/VT) and CRW20 (GY/YE) when INT 2 is selected.

This pinpoint test is intended to diagnose the following

1. Multifunction switch
2. Rear window wiper motor

Under normal operation, the wiper motor receives open and ground inputs from the multifunction switch through circuits CRW17 (GN/VT), CRW18 (VT/WH) and CRW19 (BU/OG) to activate the wipers to the appropriate intermittent speeds.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Multifunction switch
3. Windshield wiper motor

Under normal operation, the washer pump motor is grounded through internal relays in the windshield and rear window wiper motors using circuits CRW14 (BU/WH) and CRW23 (VT/GN). The multifunction switch provides input to the windshield wiper motor through circuit CRW07 (GY/BN) to activate the windshield washer. The windshield wiper motor activates the internal relay and then provides power to the washer pump through circuit CRW14 (BU/WH). The multifunction switch provides input to the rear window wiper motor through circuit CRW20 (GY/YE) to activate the rear window washer. When the rear window washer is activated, the internal relay in the rear window wiper motor provides power through circuit CRW23 (VT/GN).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Multifunction switch
3. Washer pump motor
4. Windshield wiper motor
5. Rear window wiper motor

The Smart Junction Box (SJB) sends a 12-volt reference signal on circuit CRW01 (WH) to the wiper motor module in order to monitor the status of the wipers. When the headlamp control switch is in the AUTOLAMP position and the wipers are on, the wiper motor module will pull the voltage reference signal low. Within 10 seconds, the SJB will activate the headlamps.

1. DTC B2008 (Wipers On Signal Circuit Short to Ground) - Sets when a short to ground is detected on the wiper motor on input circuit.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Windshield wiper motor
3. SJB