Wipers not working: fuse, motor, or linkage — diagnose in order
Wipers fail at the worst moment by definition — the first rain after a dry month. On a Grand Caravan the system is simple: one motor, a linkage under the cowl that converts rotation into the sweep, two arms on splined pivots, and a fuse, relay, and switch feeding the motor. Four parts, four failure patterns. The mistake to avoid is buying the expensive one (the motor) for a cheap one's failure (a popped linkage bushing). Diagnose in the order below and the symptom itself usually names the part.
Read the symptom before touching a tool
- Both arms dead, total silence. Electrical until proven otherwise: fuse, relay, switch, or a motor that has failed open.
- Motor hums or clicks, arms do not move (or barely). The motor is trying; the failure is mechanical — seized or disconnected linkage, or a stripped arm spline. Clicking in particular suggests a seized linkage.
- One arm dead, the other sweeps. Not the motor — one motor drives both arms. A stripped spline where the arm meets its pivot, or a linkage rod that has popped off that side, is the usual cause.
- Wipers park in the wrong place or stop mid-glass. The park mechanism lives in the motor assembly; this pattern points at the motor or its internal park switch rather than the linkage.
- Arms move but chatter, skip, or smear. That is blades, not the system — worn rubber or a bent arm. This guide is for wipers that do not move; blade problems end at the parts store shelf.
The ordered diagnosis
- Rule out obstruction. Ignition off. Lift each arm and confirm nothing is frozen, jammed with ice or debris, and that the arm nut feels tight. Gently try to move each arm by hand: it should move with some resistance. An arm that flops freely has lost its connection — spline or linkage — and you can skip to step 5.
- Check the fuse. Find the wiper fuse using the diagram in the owner's manual or on the fuse-box cover. A blown fuse shows a broken or discoloured element. Replace it only with the same amperage specified. If the new fuse blows when you run the wipers, stop replacing fuses — repeated blowing means the motor or linkage is drawing excess current, and the fuse is reporting a fault, not causing one.
- Listen at the motor. Have a helper turn the wipers on while you listen at the base of the windshield. Hum or click with no arm movement = mechanical failure downstream. Silence = keep going electrically.
- Test the relay by substitution. Swap the wiper relay with another relay of identical specification from the same box (many are interchangeable). If the wipers wake up, the relay was the fault. Swap back if nothing changes.
- Inspect the linkage. Ignition off, battery disconnected if you will reach in. Remove the cowl panel at the base of the windshield for a clear view of the motor and linkage. Look for a rod popped off its ball stud, a crumbled bushing, or a pivot seized with corrosion. Work the linkage by hand — it should articulate smoothly.
- Test power at the motor. Reconnect the battery, plug a multimeter into the motor connector, and have the helper switch the wipers on. Voltage present at the connector with no motor operation confirms a faulty motor. No voltage with a good fuse and relay means the fault is upstream — switch or wiring — which on a Caravan can also involve the body-control electronics; that is the honest hand-off point to a shop with proper wiring diagrams.
What success looks like: before any part is ordered, you can name the failed component and the test that proved it — "fuse good, relay swapped with no change, voltage at the connector, motor silent" is a motor. Anything vaguer is a guess with a receipt attached.
Intermittent wipers and single-speed failures
Two patterns deserve their own note because they mislead the order above. Wipers that work sometimes — fine in the morning, dead after a bump — are usually a connection problem rather than a dead part: a corroded ground, a loose motor connector, or a switch whose contacts are wearing out. Wiggle-testing the connector at the motor (step 6's location) while a helper works the switch often reproduces the fault on the spot, which is worth more than an hour of guessing. Wipers that work on one speed only point at the switch or the motor's speed circuits rather than the linkage — the linkage either moves or it does not, and it cannot choose speeds. Both patterns are why the procedure tests the switch and relay (steps 3-4) before condemning the motor: a motor replaced for a switch fault fails the same way on the drive home, with a lighter wallet. Note, too, what the diagnosis is protecting: wipers are safety equipment, and a system that works intermittently in the driveway will choose a downpour to stop being intermittent. Treat "mostly works" as "failed, pending weather."
Replacing what actually failed
Linkage bushings and rods are the cheap outcome: bushings press or snap onto the ball studs, and a linkage that popped off once because its bushing crumbled will do it again if only pushed back on. Arm splines strip when an arm is forced against ice; the fix is the arm or the pivot, tightened with the arm parked in the correct position — set the park position before tightening, or the sweep will be wrong forever. Motors come out with the linkage as an assembly on most Caravans; transfer the linkage carefully and run the motor once before refitting the cowl, so the arms can be parked and aligned on the bench, not discovered wrong in the first rain.
FAQ
The fuse was blown and the new one works. Done? Maybe — fuses do age. But note the date; a second blown wiper fuse within months is the motor or linkage asking for the full diagnosis above.
Can I drive to the shop with dead wipers? In dry weather, cautiously, yes. In rain, no — visibility is the system working. Rain is exactly when to park it.
Both arms stopped after I cleared snow with them. Classic overload: suspect the linkage or a stripped spline first (step 5), and the fuse second. Snow load is mechanical violence, and the cheap parts are designed to be its victims.