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Wiper Mechanism
By OE Match
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Runs through the tunnel to the rear wiper motor
Does not include diode

Fits:
Porsche 911 1974-89 for LHD cars
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91161202501
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975-1977 3.0L Turbo (930)
Wiper Interval Relay
The OE Match Wiper Interval Relay is a
high-quality OEM-style replacement. This relay controls the intermittent wiping function, ensuring
your windscreen wipers operate at the correct timed intervals during light rain
and changing weather conditions.
Fits:
- Porsche 911 1974-1975 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1975 3.0L Turbo (930)
Diagram ref no 34
Manufactured to match the original specifications, this OE Match relay provides dependable performance, direct-fit installation and reliable operation, making it the ideal replacement for ageing or failed original relays.
What Does the Wiper Interval Relay Do?
The wiper interval relay is an essential component of your Porsche's electrical system. It controls the timing circuit that activates the intermittent wipe feature, allowing the wiper blades to pause between sweeps instead of operating continuously.
By regulating the delay between each wipe cycle, the relay helps maintain clear visibility during drizzle or mist while reducing unnecessary wear on the wiper motor and blades.
The relay is responsible for:
- Controlling intermittent windscreen wiper operation.
- Delivering consistent timed wipe intervals.
- Sending electrical signals to the wiper motor.
- Providing smooth, factory-correct wiper performance.
- Improving visibility and driving safety in variable weather conditions.
Why Do Wiper Interval Relays Fail?
Electrical relays naturally deteriorate over time, particularly in classic vehicles where components may have been in service for decades. Heat, vibration and moisture can all contribute to internal wear and eventual failure.
Common causes include:
- Burnt or worn internal electrical contacts.
- Ageing electronic components.
- Corrosion caused by moisture ingress.
- Heat damage from years of continuous operation.
- Fatigued solder joints and internal circuitry.
- Oxidised terminals leading to poor electrical connections.
Original relays fitted to 1974-1975 Porsche 911 models are now approximately fifty years old, making replacement a sensible preventative maintenance upgrade.
Symptoms of a Faulty Wiper Interval Relay
A failing relay can cause several noticeable problems,
including:
- Intermittent wipe function no longer operates.
- Wipers only work on continuous settings.
- Irregular or inconsistent wipe intervals.
- Delayed or erratic wiper activation.
- Wipers stopping unexpectedly during operation.
- Audible relay clicking without correct wiper movement.
- Complete loss of intermittent wipe functionality.
Replacing the relay is often the quickest and most effective way to restore normal operation.
When Should the Relay Be Replaced?
The OE Match Wiper Interval Relay should be replaced whenever intermittent wipe performance becomes unreliable or electrical testing confirms relay failure.
Many Porsche owners also choose to replace ageing relays during restoration projects or preventative maintenance to improve long-term reliability and reduce the risk of electrical faults.
A new relay helps restore dependable operation while preserving the original driving experience of your classic Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91161814900
The product you are viewing cross references to these numbers
OEMatch Wiper Mechanism — Fit, Function, Confidence
Wiper mechanisms convert the motor’s rotation into the sweeping motion of the arms, setting blade angle and contact pressure to clear the windscreen. This collection is presented for Porsche models and is intended to support restoration and routine maintenance where reliable wiping is required.
Available Types
- Complete linkage assemblies and transmissions
- Rebuild kits for pivots, bushings and arms
- Replacement transmissions and mounting brackets
Understanding OEMatch Wiper Mechanism
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original wiper mechanism. OE (Original Equipment) refers to parts matching original specifications for the wiper mechanism and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM wiper mechanism engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. The mechanism links the motor to the blade arms through joints, pivots and linking rods to produce smooth, synchronized motion. OEMatch maintains a broad catalogue of Porsche parts and references to assist with maintenance and restoration tasks.
Benefits Include
- Restores smooth, synchronized sweep and consistent blade contact
- Reduces noise and uneven motion that can distract or obscure vision
- Helps limit further wear to the wiper motor and blades
Why Wiper Mechanisms Wear and Fail
- Worn joints or bushings, resulting in excess play or intermittent motion
- Corroded linkages and pivots, causing stiffness or seizure
- Broken pivot arms or connecting rods from frozen wipers or excessive load
The Importance of Replacing with OEMatch Wiper Mechanism
A correctly functioning mechanism is fundamental to windscreen visibility in adverse weather. Replacing a worn or damaged mechanism restores consistent blade sweep and reduces the risk of motor overload or intermittent operation. For Porsche vehicles, choosing a like-for-like replacement helps maintain the intended range of motion and blade contact across the screen.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Components selected to fit original mounting points and to work with existing wiper motors and arms
- Options for repair or complete replacement to suit restoration or maintenance needs