This 2012 Renault Megane came in with the front windscreen wipers completely dead while the rear wiper still worked fine. This immediately rules out the stalk as the fault and points to a problem specific to the front wiper circuit — most likely the motor or its connections.
This guide covers the full diagnostic process: removing the wiper linkage from under the scuttle panel, testing the motor’s power supply with a multimeter, and inspecting the motor internally for corrosion on the contact ring. The fault on this one turned out to be a poor earth contact inside the motor due to moisture ingress — which cleaned up and worked immediately. The customer ultimately chose a new motor for long-term reliability.
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Step-by-Step Guide
Confirm the Fault
Turn the ignition on and operate the wiper stalk. Front wipers completely dead. Operate the rear wiper — works fine. This confirms the fault is not the stalk. Check the wiper fuse in the fusebox — if blown, replace it first and retest.
Remove the Wiper Arms
Pull off the small plastic caps at the base of each wiper arm. Undo the 16mm nuts underneath. Wiggle each wiper arm off its spline — they can be tight; grip firmly and rock side to side. Don’t lose the washers.
Remove the Weather Strip & Scuttle Panel
Peel off the rubber weather strip that runs along the base of the windscreen — it has two clip locations one either side. Gently lift the scuttle panel away from the car, taking care as the plastic can be brittle with age. Move it completely clear to reveal the wiper motor and linkage assembly beneath.
Remove the Wiper Motor & Linkage
The motor bracket is held by a 41mm bolt at the front. Remove this and move the bracket aside. Undo the 10mm bolt on the left side of the motor and the 10mm bolt on the right. Use a small hook tool behind the wiring plug tab to lift it and pull the plug free. The whole motor and linkage assembly now lifts out.
Test for Power at the Plug
With the assembly out but before further dismantling, test whether power was reaching the motor. Set a multimeter to DC voltage. Find a good earth on the engine bay metalwork and probe the wiper plug terminals with the ignition on and the wiper stalk activated. On this Megane the reading was 11.9V — confirming power is reaching the motor and the fault is within the motor itself.
Open the Motor & Inspect Internally
On the bench, use a small screwdriver or pick to gently prise up the plastic clips around the motor back cover and pop it off. Inside you will see the worm gear, drive gears and the electrical contact ring. Check carefully — on this motor one of the contact points showed a slightly melted or burnt appearance with poor contact to the body. This indicates moisture had entered and caused a short circuit on the earth return path.
Clean the Contacts
Use fine sandpaper to clean the contact point on the ring and the corresponding contact on the motor body until both are shiny and clean. Very gently bend the spring contact outward slightly to increase the contact pressure. Reassemble the cover and retest by reconnecting the plug and operating the wiper stalk with the ignition on — the motor should run immediately if the contact was the fault.
Refit or Replace Motor & Reassemble
Whether refitting the cleaned original or fitting a new motor, refit is the reverse of removal: locate the motor and linkage into position, refit both 10mm bolts, refit the front bracket bolt, and reconnect the wiring plug. Refit the scuttle panel and rubber weather strip. Refit the wiper arms ensuring the splines are correctly aligned with the wipers in their parked position. Test the wipers through all speeds and confirm full operation.
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