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Re: 25amp fuse blows when ignition is tured on volvo940...
Disconnect (unplug) all the units that are supplied by the 25A fuse.
Switch on ignition and check that fuse has not blown- if it blows under these conditions the short or overload to ground is:-
a) in the wiring to one of the units,
b) or there is some other unidentified faulty unit still connected.
Re-connect each unit one at a time, observing fuse status.
If one of the units has a short / fault, it will blow the fuse when it is connected back in circuit.
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WPR/WSW fuse 25amp is located in the under hood fuse box . This a complex system ,controlled by the BCM . If you find that the fuse is good i suggest you take it to a qualified repair shop . This wiper / washer system has the capability to set DTC'S - diagnostic trouble codes !
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
The Body Control Module (BCM) monitors the control circuit of the WIPER relay. The voltage level should be low while the WIPER relay is de-energized and near system voltage when the relay is energized. After the BCM receives a low, intermittent, or mist signal from the wiper/washer switch, it responds by applying battery voltage through the WIPER relay control circuit to the coil side of the relay, energizing the WIPER relay.
DTC B3873 00: Front Washer Relay Circuit
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
I really don't think this is a fuse problem , but if it is a blown fuse they don't just blow for no reason . Low resistance high current flow ,short to ground .
The wiper / washer switch is a input to the BCM - body control module . Depending on switch position the BCM will energize a relay the WPR relay or the WPR HI relay .
What # fuse's J5 25amp , J4 25amp , M 30 15amp , M13 20amp M33 10amp . All these fuse's are power supply's for door modules and to the wiper / washer switch . The washer pump is controlled by the totally integrated power module . I suggest you google TIPM - dodge totally integrated power module . Chrysler , Dodge , Jeep all use this componet . Also watch youtube videos on finding a automotive electrical short . That's what you have a direct short to ground on those power supply circuits
if the horn doesn't work it is most likely the rotating ribbon circuit contract under the steering wheel called the "clock spring contact", the circuit runs along a plastic ribbon and that breaks from all the turing of the steering wheel over the years, then the horn button is no longer connected to the horn circuit.
You may have some short circuits in your wiring, a bad horn relay or horn unit, and/or a bad wiper motor. Hard to tell without actually looking at it.
Disconnect the horn, and try another fuse. Does it blow? If not, the horn is shorted, and needs replaced. If it blows, remove the horn relay & try another fuse. Same with the wiper motor, unplug it and try another fuse. If it does not blow, you need a wiper motor.