BMW M50 / M52 / S50 / S52 Terminated Engine Harness — for Haltech Nexus R3

Dropping a BMW inline-six into your build? This terminated engine harness is purpose-configured to run the BMW M50, M52, S50 and S52 engines with the Haltech Nexus R3 ECU. Built to take the guesswork and the hours of pinning out of your swap, it delivers plug-in terminated connections for the engine, so you can get from box to running base tune faster.

This is an engine-swap harness. It's designed to wire up the BMW six-cylinder engine itself — ideal for swapping one of these engines into another chassis or custom build. It is not a plug-and-play harness for a factory E36 chassis on its own (see the chassis conversion option below).

Please note: the Haltech Nexus R3 ECU is not included and must be purchased separately. This harness is designed to work exclusively with the Nexus R3.

VANOS Control

This harness is configured as standard for BMW's single VANOS variable valve timing on the intake cam. These engines use a single cam position sensor, and the harness is wired accordingly for accurate, reliable timing control with the Nexus R3.

Dual VANOS Control (Optional Add-On)

Running a dual VANOS engine? Select the Dual VANOS Control option from the drop-down above. This adds the additional cam sensor wiring and configuration required to control variable valve timing on both the intake and exhaust cams. Because this involves extra work, it's offered as a separate add-on — leave it unselected for standard single VANOS setups.

E36 Chassis Conversion (Optional Add-On)

Running this in a factory E36 chassis (1992–2000)? Select the E36 Chassis Conversion option from the drop-down above. This adds the additional wiring and configuration work required to integrate the harness with the native E36 chassis. Because this involves extra work, it's offered as a separate add-on — leave it unselected if you're using this purely as an engine-swap harness in another chassis.

Supported BMW Engines

• M50 / M50TU (2.5L inline-six)
• M52 (2.5L & 2.8L inline-six)
• S50 (3.0L & 3.2L inline-six)
• S52 (3.2L inline-six — US-market M3)

Terminated Connections Include

• Nexus R3 ECU connectors
• Crank and cam sensors
• Oil and fuel pressure sensors
• Coolant and intake air temperature sensors
• Throttle and pedal connectors
• Knock sensors
• Bosch LSU 4.9 wideband lambda sensor
• Ignition switch input and alternator control
• 6x injector and 6x ignition outputs
• Thermofan and fuel pump control
• Transmission wiring
• Spare inputs and outputs
• Haltech CAN devices

Why a Terminated Harness?

• Plug-in ready: Terminated connections on the engine side — no pinning required for the core install
• Application-specific: Configured for the BMW six-cylinder platform, reducing wire assignments needing setup in the NSP software
• Swap-friendly: Built to make dropping a BMW inline-six into your chassis clean and straightforward
• Spare I/O: Room to expand for your build's extras
• Haltech CAN ready: Connect dashes, keypads, PDMs, wideband controllers, I/O expanders and more

Requirements

• Haltech Nexus R3 ECU (sold separately — required)
• Application-appropriate sensors and engine components
• Compatible BMW six-cylinder engine (see supported list above)
• Dual VANOS Control add-on (only if running a dual VANOS engine)
• E36 Chassis Conversion add-on (only if integrating with a factory E36 chassis)

Note: This harness is configured specifically for the BMW M50/M52/S50/S52 engine and works exclusively with the Haltech Nexus R3 ECU. Please confirm your exact engine variant and fitment before ordering.