The genuine BMW yellow plug housing (part number 61131378419) is a 2-pin electrical connector housing featuring a 90-degree right-angle design. While it serves as a universal connector housing for multiple low-voltage electrical systems, its most common uses across the BMW lineup include:
- Ambient Outside Temperature Sensor Plug: It is widely used to connect the vehicle's engine or dashboard computer to the ambient temperature sensor, which is usually tucked inside the front bumper or wheel well area.
- Radiator Sensor / AC Fan Switch: It frequently snaps into the temperature switches located on the side of the radiator that dictate when the auxiliary air conditioning fan cycles on and off.
- Various Lamps and Lighting: In newer chassis, it supplies power to select auxiliary bulbs or small electronic modules.
This part is exceptionally versatile, spanning spanning three distinct eras of BMW engineering across 1984 to 2014:
- Classic Era (E30 3 Series & E34 5 Series)
- Mid-2000s Era (E60 / E61 5 Series)
- Modern Era (E82 / E88 1 Series & E36/E38/E39 Variants)
Color-Coded 2-Pin Sensor Housings - for BMW E30 models (84-93) - BMW used color-coded alignment tabs (keyways) on these 90-degree plastic shells so mechanics would not cross-connect adjacent wiring harnesses. All four variants are used across US E30 models (318i, 318is, 325e, 325es, 325i, 325is, 325iX, and M3). The "408's" are sold out...I have the other 4 in stock.
- Black (
61131378416 / 61131378408). Used for the rear differential speed sensor, late-model horns, and washer fluid pumps.
- White (
61131378417). Used on the rear differential speed sensor (depending on production year) and coolant/washer level switches.
- Grey (
61131378418). Used for fog lights, headlight/intensive washer pumps, and fluid level sensors.
- Yellow (
61131378419). Exclusively keyed for the on-board computer (OBC) ambient exterior temperature sensor located in the front brake cooling duct.
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