Wiring & pinout

Wiring is the part the official manual spreads across many individual pages (pinout, MAP sensor, foot brake, switches, displays, speed output, selector connectors, mechatronic mods).

Start with the Pinout Explorer: every pin, filterable by layer (power, ground, CAN, selector, sensors, outputs, options), with its function and wire colour.

Core power & ground connections

[!IMPORTANT] Battery +12V (Pins 51, 52, 53) must be permanently powered via a dedicated 15A fuse directly from the battery (not ignition switched). The TCU requires continuous power to manage parking lock solenoid states and perform safe shut-down. If +12V battery power cuts out with the ignition, the mechanical parking lock may fail to release or engage properly.

• Permanent Battery Power (+12V): Pins 51, 52, 53 (3 × 0.75–1.0 mm² wire via 15A fuse).
• Switched Ignition (+12V Ign): Pin 35 (Ignition switch +12V).
• TCU Logic Ground: Pins 1, 2, 3 (Device ground, 3 × 0.5–1.0 mm²).
• TCU Power Ground: Pins 43, 44, 45 (Power stage ground, 3 × 0.75–1.0 mm² to chassis).
• CAN1 (Selector Bus): Pin 68 (CAN1 Low), Pin 69 (CAN1 High).
• CAN2 (Engine ECU Bus): Pin 66 (CAN2 Low), Pin 67 (CAN2 High).
• Gearbox Connector: Pins 21–24 (+12V Solenoids), 25–28 (Speed Sensor Power), 46–48 (Solenoid Drives), 71–85 (Valves / Speed Sensors).

Key analog input pins

The analog inputs A1–A12 map to fixed connector pins. The standard defaults are:

The footbrake, and whether it can come over CAN

The TCU will not engage a drive gear without a brake signal. Get this right before the car moves.

The simplest, bulletproof method is a dedicated wire: Pin 11 (A7) connected to +12V from the brake-light switch circuit (Footbrake Signal Input set to 7).

It can also come over CAN: set Footbrake Signal Input to 13 (CAN Input) with Footbrake Automatic Detection enabled:

If running a Haltech or custom ECU on Can2A without a brake bit, you can configure Can2B to run "TCU Standard 2" (profile 7) in parallel on the same bus to receive the brake frame over CAN.

2-Wire paddle gear selector operation

The TurboLamik TCU can operate complete transmission selection (Drive, Reverse, Park, and Manual shifting) using only two ground-switched paddle inputs (Pin 36 / A11 for Up, Pin 37 / A12 for Down):

[!NOTE] Priority Rule: If a physical CAN selector (BMW shifter, Dodge dial, or Blink CAN Keypad) is present on CAN1, the CAN selector acts as the Master. The paddles then operate exclusively as manual up/down shift overrides in forward gears.

Multiplexed paddles with horn (Single Clockspring Wire)

For steering wheels with only one available through-wire in the clockspring, the paddles and horn button can be multiplexed onto Pin 10 (A6) using a resistor divider network:

• Resting state: Open circuit.
• Horn pressed: Direct short to Ground.
• Downshift paddle pressed: Ground through a 470Ω resistor.
• Upshift paddle pressed: Ground through a 1.2kΩ resistor.

Vehicle Speed Output (VSS)

The TCU provides a configurable vehicle speed signal on auxiliary outputs (AUX1 / Pin 54 or AUX2 / Pin 55) for aftermarket ECUs, digital dashes, and speedometers:

1. Digital Square Wave (+5V or +12V):
   • Configurable for modern standalone ECUs, speedometers, and digital displays.
   • Select +5V or +12V pull-up depending on the dash input specification.
2. Sinusoidal VR Output (Vintage / Analog Dashboards):
   • For older classic gauge clusters (such as BMW E30 or vintage European/Japanese clusters) that require an inductive Variable Reluctance (VR) AC sinusoidal signal.
   • Use the official TurboLamik VSS-to-VR Converter Module connected to the TCU AUX square-wave output to generate a clean +5V or +12V AC sinusoidal signal.

BMW xDrive transfer case controller wiring

When swapping an 8HP into an xDrive vehicle or controlling an external BMW ATC transfer case:

• BMW E60 / E90 (ATC350 / ATC300):
  • Transfer case clutch motor (+) connects to TCU Pin 86 (AUX Power Out).
  • Transfer case clutch motor (-) connects to TCU Pin 49 (Power Ground / Motor Drive).
  • Position sensor Hall inputs connect to 5V (Pin 61), GND (Pin 16), and Signal (Pin 5).
• BMW X3 / X5 (ATC450 / ATC500):
  • Motor actuator wiring routed to high-current output stages on pins 86/87.
  • Set AWD Mode and AWD torque split tables in calibration parameters under AWD Settings.

BMW G-Series & Toyota Supra MK5 (A90) shock tower connector

When installing the TCU into a G-Series BMW or A90 Supra factory automatic chassis without an aftermarket plug-and-play harness, rewire the round connector located on the right-side front shock tower in the engine bay directly to the TCU:

BMW F-Series manual-to-8HP swap conversion

When converting a factory manual BMW F2x / F3x / F8x to an 8HP automatic:

1. CAN Bus Integration: Connect CAN2 (pins 66/67) into the vehicle PT-CAN bus at the FEM (Front Electronic Module) or ICM harness.
2. Gear Selector: Wire an F-Series 8-pin or 10-pin electronic shifter to CAN1 (pins 68/69), with +12V switched and ground. Set CAN1 Type Selector = 32.
3. Clutch Switch Bypass: Bridge or code out the manual clutch safety start switch in the FEM/DME to allow starter motor cranking without a physical clutch pedal.
4. Reversing Lights: Map AUX12 (Pin 57) to trigger the reversing light circuit or broadcast Reverse gear over PT-CAN.

Double-check pin assignments against your exact harness before powering up. Use Pinout Explorer for interactive filtering.