Question about 1998 Ford Mustang
The lower settings don't work but the highest/fastest speed does
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Posted on Jan 02, 2017
SOURCE: Windshield wiper relay
this might be a connection/ currosing problem. Check the windshild wiper relay for loose wires and then take apart the connection. Clean them up and put back together. also check your fuses.
Posted on Nov 24, 2009
Try replacing relay for wiper with another same relay from fuse block from another working accessory.Had same issue on friends Ford Ranger. Moved relays and cleaned harness connection at fuse block. Works fine.
Posted on Mar 14, 2010
If the system is a Manual ( not the EATC / Electronic Automatice Temperature Control System ) it is most likely the blower motor resistor.
For the new body style 2004 ( not the 2004 Heritage or Lightning models ), it is behind the glove box.
Open teh glove box, press on one side, to allow the glove box to hang down.
The Blower motor resistor is located in the side of the blower motor housing.
If your 2004 is a Heritage or Lightning, the blower motor resistor is access from under the dash / glove box area.
On this type ( same as the 97-03 ) the blower motor resistor or the resistor and pigtail might need to be replaced.
Just pay attention to which body style 2004 you have ( new like the 2005-2008 or the 2004 Heritage / Lightning, which looks like the 97-03 MY trucks.
Posted on Aug 12, 2010
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Feb 09, 2016 | Cars & Trucks
Body control module (BCM)
Wiper PCB relay
Wiper high PCB relay
Windshield wiper motor
Windshield washer fluid pump
Windshield washer fluid level switch
WPR fuse 25 A
WSW fuse 10 A
Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
High Speed Operation When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the wiper PCB relay, as stated above, and the wiper high PCB relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.
Wiper motor high speed operation and the wiper high speed PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
You could Have a switch problem , BCM problem ,PCB relay problem , the pcb relays are non serviceable an the whole under hood fuse box would need to be replaced . Malfunctioning motor bad ground some where etc.....
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