Window regulator switches are the push-button or rocker controls mounted in the door panel that send a low-voltage signal to the window motor and relay, commanding the glass to rise or fall. On most modern vehicles, the driver's door contains a master switch assembly that controls all four windows, while each passenger door has its own individual switch. Failure is common and the most frequent cause is contamination: liquid spills seep beneath the button membrane or rocker contact surface, corroding the copper contacts underneath and causing intermittent operation — the window works when the interior is warm, then refuses when cold. Mechanical contact wear from high daily use and broken internal plastic retaining clips are secondary failure modes. Diagnosis is straightforward once the switch is removed and tested for continuity. CASCO and VEMO both manufacture window regulator switches to OEM dimensions and connector pinout specifications, ensuring plug-and-play fitment without wiring adaptors. Because connector housing shapes and pin counts differ across vehicle generations and door positions — particularly on VW Group and Mercedes-Benz platforms — the OE number is the definitive reference for selecting the correct switch. Aftermarket units that don't match the original connector can require soldering or cause fault codes in the body control module.
Window regulator switches are position-specific — the driver's master switch, front passenger, and rear door switches all use different housings, pin counts, and connector orientations even within the same model. Use the make-model-year selector on this page to narrow down to your door position and trim level. On VW Group cars in particular, the same switch bezel can carry different circuit configurations depending on whether the door has a single or combined window and mirror control, so the OE number is the only reliable differentiator.
OEM switches from suppliers like CASCO or VEMO use the same connector housing, contact material, and IP-rated membrane as the original. Quality aftermarket units match the connector pinout and button travel precisely, allowing direct plug-in replacement. Cheaper aftermarket switches may use inferior contact plating that corrodes quickly in the humid environment of a door cavity, producing intermittent operation within months rather than the years of reliable service expected from an OEM-specification part.
Sometimes. If the fault is limited to corroded contacts on a rocker or membrane switch, careful cleaning with electrical contact cleaner and a cotton bud can restore function temporarily. However, if the internal copper contact tracks have pitted or the plastic housing is cracked, repair is not practical. Replacement switches are generally inexpensive compared to the labour time for a door panel removal and diagnosis cycle, so replacement is usually the more cost-effective route once the switch has been confirmed faulty.
Intermittent operation is the most common symptom — the window works on some presses but not others, or responds only when the switch is held at a specific angle. A window that operates from one switch but not another in the same door confirms a switch rather than a motor or regulator fault. Complete failure with no motor noise at all, while the other windows work normally, is almost always a switch fault. Occasionally a burning smell from within the door panel indicates a switch arcing internally and should be addressed promptly.
Showing 100 of 3,177 Window regulator switch OE numbers. Enter the OE on the main OE search to jump to any reference.
